subject:(Microgrids)

Kansas State University

1. Ren, Wei. The feasibility of microgrids for large facilities.

Degree: MS, Department of Architectural Engineering and Construction Science, 2017, Kansas State University

URL: http://hdl.handle.net/2097/35482

► Typical building power supplied from power plants has significantly evolved over the last century. After power is generated and transferred from the power plant, it… (more)

Subjects/Keywords: Microgrids; Large facilities

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ren, W. (2017). The feasibility of microgrids for large facilities. (Masters Thesis). Kansas State University. Retrieved from http://hdl.handle.net/2097/35482

Chicago Manual of Style (16^th Edition):

Ren, Wei. “The feasibility of microgrids for large facilities.” 2017. Masters Thesis, Kansas State University. Accessed December 15, 2019. http://hdl.handle.net/2097/35482.

MLA Handbook (7^th Edition):

Ren, Wei. “The feasibility of microgrids for large facilities.” 2017. Web. 15 Dec 2019.

Vancouver:

Ren W. The feasibility of microgrids for large facilities. [Internet] [Masters thesis]. Kansas State University; 2017. [cited 2019 Dec 15]. Available from: http://hdl.handle.net/2097/35482.

Council of Science Editors:

Ren W. The feasibility of microgrids for large facilities. [Masters Thesis]. Kansas State University; 2017. Available from: http://hdl.handle.net/2097/35482

Georgia Tech

2. Street, Michael. Integrated performance based design of communities and distributed generation.

Degree: PhD, Architecture, 2016, Georgia Tech

URL: http://hdl.handle.net/1853/56258

► The vertically integrated utility market within the U.S. is undergoing rapid changes due to the rise of small-scale distributed power generation known as microgrids, which… (more)

▼ The vertically integrated utility market within the U.S. is undergoing rapid changes due to the rise of small-scale distributed power generation known as microgrids, which are local networks of power generation and distribution typically serving a demand less than 40 MW. Primary drivers for microgrid investment are the performance benefits these systems return to their owners, which include increased reliability, reduced emissions and reduced operating costs. We define a novel modeling methodology to represent the microgrid as an integrated system of the demand and supply. Previous work to develop an integrated system model does not adequately model the building thermal demand, incorporate a modeler’s knowledge of the grid’s availability or allow for a user to model their tolerance for unmet demand. To address these modeling issues, we first demonstrate a technique for representing a building stock as a reduced order hourly demand model. Next, as demand side measures are typically defined at the building level as discrete options, we demonstrate a technique for converting a large discrete optimization problem into a simplified continuous variable optimization problem through the use of Pareto efficient cost functions. The reduced problem specification results in 90% fewer function evaluations for a benchmark optimization task. Then, we incorporate two new features into the Distributed Energy Resource Customer Adoption Model (DER-CAM) developed by Lawrence Berkeley National Laboratory (LBNL) that allow users to define grid outage scenarios and their limit of expected energy demand not served. Applying the integrated model to a microgrid design scenario return solutions that exhibit on average an 8% total annual cost reduction and 18% reduction in CO2 emissions versus a Supply Only case. Similarly, the results on average reduce total annual cost by 5% and annual emissions by 17% for a Demand First case. In summary, we present a modeling methodology with application to joint decision making that involve renewable power supply, building systems and passive building design measures and recommend this model for performance based microgrid design. Advisors/Committee Members: Augenbroe, Godfried (advisor), Brown, Jason (committee member), Jackson, Roderick (committee member), Stadler, Michael (committee member), Grijalva, Santiago (committee member).

Subjects/Keywords: Microgrids; Reliability; Integrated system

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Street, M. (2016). Integrated performance based design of communities and distributed generation. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/56258

Chicago Manual of Style (16^th Edition):

Street, Michael. “Integrated performance based design of communities and distributed generation.” 2016. Doctoral Dissertation, Georgia Tech. Accessed December 15, 2019. http://hdl.handle.net/1853/56258.

MLA Handbook (7^th Edition):

Street, Michael. “Integrated performance based design of communities and distributed generation.” 2016. Web. 15 Dec 2019.

Vancouver:

Street M. Integrated performance based design of communities and distributed generation. [Internet] [Doctoral dissertation]. Georgia Tech; 2016. [cited 2019 Dec 15]. Available from: http://hdl.handle.net/1853/56258.

Council of Science Editors:

Street M. Integrated performance based design of communities and distributed generation. [Doctoral Dissertation]. Georgia Tech; 2016. Available from: http://hdl.handle.net/1853/56258

Queens University

3. Seidi Khorramabadi, Sima. Adaptive Critic-based Control of Voltage Source Converters in Microgrid Systems .

Degree: Electrical and Computer Engineering, 2014, Queens University

URL: http://hdl.handle.net/1974/12615

► Control of microgrids, as the main building blocks of the future smart power grid, is an important problem which has initiated many research activities in… (more)

▼ Control of microgrids, as the main building blocks of the future smart power grid, is an important problem which has initiated many research activities in recent years. The microgrid should appear to the power grid as a single united entity, in which the majority of distributed energy resources are interfaced through voltage source converters (VSCs). In dynamic situations, specific structure, natural nonlinearity, and low physical inertia of VSCs may lead to higher sensitivity to network disturbances and power oscillations and in occasions result in violation of overall stability; hence the need for fast and flexible control techniques in the microgrid is evident. The design simplicity and easy implementation of PI controllers have resulted in their popularity in controlling VSCs; however their application is associated with a number of drawbacks such as poor harmonics attenuation and unsatisfactory operation in case of load changes and high penetration of distributed generators. In this Ph.D. thesis, three different control algorithms are proposed for VSCs in microgrid systems. The control systems are based on the adaptive critic-based control concept and employ an element called critic whose task is to evaluate the credibility of the performance and compare it with the desired goals. The critic’s evaluations are then used in an on-line procedure to update the controller parameters during dynamic transients. The critic-based control idea is used in conjunction with PI and neuro-fuzzy controllers. With the proposed approach, the need for precise design of the controller is removed, and because of the supervisory role of the critic, no complicated mathematical calculations are required for its design. This fact increases the degree of intelligence and adaptivity against changes such as high penetration of distributed generators and dynamically demanding situations like presence of motor loads and results in a self-tuning and non-model-based control system with high computational speed. The simulation results verify that the application of the proposed approach significantly improves the dynamic performance by reducing the convergence time, output oscillations, tracking error, and unwanted current harmonics and confirm the effective control in case of high penetration of distributed generators.

Subjects/Keywords: Power Electronics; Fuzzy Logic; Microgrids

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Seidi Khorramabadi, S. (2014). Adaptive Critic-based Control of Voltage Source Converters in Microgrid Systems . (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/12615

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Seidi Khorramabadi, Sima. “Adaptive Critic-based Control of Voltage Source Converters in Microgrid Systems .” 2014. Thesis, Queens University. Accessed December 15, 2019. http://hdl.handle.net/1974/12615.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Seidi Khorramabadi, Sima. “Adaptive Critic-based Control of Voltage Source Converters in Microgrid Systems .” 2014. Web. 15 Dec 2019.

Vancouver:

Seidi Khorramabadi S. Adaptive Critic-based Control of Voltage Source Converters in Microgrid Systems . [Internet] [Thesis]. Queens University; 2014. [cited 2019 Dec 15]. Available from: http://hdl.handle.net/1974/12615.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Seidi Khorramabadi S. Adaptive Critic-based Control of Voltage Source Converters in Microgrid Systems . [Thesis]. Queens University; 2014. Available from: http://hdl.handle.net/1974/12615

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Urbana-Champaign

4. Cady, Stanton T. Architectures and Algorithms for Distributed Generation Control of Microgrids.

Degree: PhD, Electrical & Computer Engr, 2016, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/90729

► Microgrids and the control challenges they pose have recently received significant attention in a wide array of research communities. While the potential to increase efficiency,… (more)

▼ Microgrids and the control challenges they pose have recently received significant attention in a wide array of research communities. While the potential to increase efficiency, reliability, and adaptability of the utility grid is a primary motivation for their development, microgrids can also be used to meet the growing electric power demands in numerous applications. Compared with large power systems, microgrids may rely on inertia-less generators such as photovoltaic arrays that are interfaced through an inverter. Although the lack of inertia and other microgrid characteristics pose control challenges, microgrids are amenable to new control paradigms, e.g., those that rely on distributed computations rather than a centralized processor. We address the problem of distributed generation control in islanded ac microgrids with and without inertia. In the case of microgrids comprising heterogeneous generators, some of which have inertia, we propose a control architecture for frequency regulation and optimal dispatch designed to take advantage of microgrid-specific properties. For microgrids with no inertia, we propose a control architecture that is designed to drive the average frequency error to zero while ensuring that the frequency at every bus is equal and that the operating point that results is stable. In both cases, we also propose an implementation of each control architecture that relies on distributed algorithms that eliminate the need for a centralized processor with global information. For the architecture we propose for microgrids with inertia, we provide analytical and experimental results that verify the effectiveness of the proposed architecture, and illustrate the performance of the distributed algorithms on which it relies under a variety of scenarios. We verify the proposed control architecture for inertia-less microgrids by analytically showing that the resulting closed-loop system is stable; we also illustrate the features of the architecture using numerical simulations of three test cases applied to six- and 37-bus networks. Advisors/Committee Members: Dominguez-Garcia, Alejandro D. (advisor), Dominguez-Garcia, Alejandro D. (Committee Chair), Hadjicostis, Christoforos N. (committee member), Sauer, Peter W. (committee member), Vaidya, Nitin H. (committee member).

Subjects/Keywords: Power systems; Microgrids; Distributed control; Islanded microgrids; Frequency regulation; Optimal dispatch

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Cady, S. T. (2016). Architectures and Algorithms for Distributed Generation Control of Microgrids. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/90729

Chicago Manual of Style (16^th Edition):

Cady, Stanton T. “Architectures and Algorithms for Distributed Generation Control of Microgrids.” 2016. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed December 15, 2019. http://hdl.handle.net/2142/90729.

MLA Handbook (7^th Edition):

Cady, Stanton T. “Architectures and Algorithms for Distributed Generation Control of Microgrids.” 2016. Web. 15 Dec 2019.

Vancouver:

Cady ST. Architectures and Algorithms for Distributed Generation Control of Microgrids. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2016. [cited 2019 Dec 15]. Available from: http://hdl.handle.net/2142/90729.

Council of Science Editors:

Cady ST. Architectures and Algorithms for Distributed Generation Control of Microgrids. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2016. Available from: http://hdl.handle.net/2142/90729

University of Alberta

5. Radwan, Amr A A. Modeling, Analysis and Stabilization of Converter-Dominated Power Distribution Grids.

Degree: MS, Department of Electrical and Computer Engineering, 2011, University of Alberta

URL: https://era.library.ualberta.ca/files/8k71nh35s

► The energy sector is moving towards extensive use of power electronic (PE) converters to interface distributed generation (DG) units and modern converter-interfaced loads (CILs). Therefore,… (more)

Subjects/Keywords: Constant Power; Microgrids; Converters; Stabilization; Nyquist

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Radwan, A. A. A. (2011). Modeling, Analysis and Stabilization of Converter-Dominated Power Distribution Grids. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/8k71nh35s

Chicago Manual of Style (16^th Edition):

Radwan, Amr A A. “Modeling, Analysis and Stabilization of Converter-Dominated Power Distribution Grids.” 2011. Masters Thesis, University of Alberta. Accessed December 15, 2019. https://era.library.ualberta.ca/files/8k71nh35s.

MLA Handbook (7^th Edition):

Radwan, Amr A A. “Modeling, Analysis and Stabilization of Converter-Dominated Power Distribution Grids.” 2011. Web. 15 Dec 2019.

Vancouver:

Radwan AAA. Modeling, Analysis and Stabilization of Converter-Dominated Power Distribution Grids. [Internet] [Masters thesis]. University of Alberta; 2011. [cited 2019 Dec 15]. Available from: https://era.library.ualberta.ca/files/8k71nh35s.

Council of Science Editors:

Radwan AAA. Modeling, Analysis and Stabilization of Converter-Dominated Power Distribution Grids. [Masters Thesis]. University of Alberta; 2011. Available from: https://era.library.ualberta.ca/files/8k71nh35s

Penn State University

6. Austin, Peter Miller. Developing a Stability Assessment Method for Power Electronics-based Microgrids.

Degree: PhD, Mechanical Engineering, 2015, Penn State University

URL: https://etda.libraries.psu.edu/catalog/27190

► Modern microgrids with microsources and energy storage are dependent on power electronics for control and regulation. Under certain circumstances power electronics can be destabilizing to… (more)

Subjects/Keywords: microgrids; power electronics stability; negative incremental impedance

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Austin, P. M. (2015). Developing a Stability Assessment Method for Power Electronics-based Microgrids. (Doctoral Dissertation). Penn State University. Retrieved from https://etda.libraries.psu.edu/catalog/27190

Chicago Manual of Style (16^th Edition):

Austin, Peter Miller. “Developing a Stability Assessment Method for Power Electronics-based Microgrids.” 2015. Doctoral Dissertation, Penn State University. Accessed December 15, 2019. https://etda.libraries.psu.edu/catalog/27190.

MLA Handbook (7^th Edition):

Austin, Peter Miller. “Developing a Stability Assessment Method for Power Electronics-based Microgrids.” 2015. Web. 15 Dec 2019.

Vancouver:

Austin PM. Developing a Stability Assessment Method for Power Electronics-based Microgrids. [Internet] [Doctoral dissertation]. Penn State University; 2015. [cited 2019 Dec 15]. Available from: https://etda.libraries.psu.edu/catalog/27190.

Council of Science Editors:

Austin PM. Developing a Stability Assessment Method for Power Electronics-based Microgrids. [Doctoral Dissertation]. Penn State University; 2015. Available from: https://etda.libraries.psu.edu/catalog/27190

Virginia Tech

7. Krovvidi, Sai S. Competitive Microgrid Electricity Market Design.

Degree: MS, Electrical and Computer Engineering, 2010, Virginia Tech

URL: http://hdl.handle.net/10919/32964

► The electric power grid forms the foundation for several other critical infrastructures of national importance such as public health, transportation and telecommunication systems, to thrive.… (more)

▼ The electric power grid forms the foundation for several other critical infrastructures of national importance such as public health, transportation and telecommunication systems, to thrive. The current power grid runs on the century-old technology and faces serious challenges of the 21st century - Ever-increasing demand and the need to provide a sustainable way to meet the growing demand, increased requirement of resilience against man-made and natural disasters, ability to defend against cyber attacks, increasing demand for reliable power, requirement to integrate with alternate energy generation and storage technologies. Several countries, including the United States, have realized the immediate need to modernize the grid and to pursue the goal of a smart grid. Majority of recent grid modernization efforts are directed towards the distribution systems to be able to meet these new challenges. One of the key enablers of a fully functional Smart Grid are microgrids â subsystems of the grid, utilizing small generation capacities at the distribution system level to increase the overall reliability and power quality of the local grid. It is one of the key directions recommended by national electric delivery technologies roadmap in United States as well as policy makers for electricity delivery in many countries. Microgrids have witnessed serious research activity in the past few years, especially in areas such as multi-agent system (MAS) architectures for microgrid control and auction algorithms for microgrid electricity transaction. However, most of the prior research on electricity transaction in microgrids fails to recognize and represent the true nature of the microgrid electricity market. In this research, a comprehensive microgrid electricity market has been designed, taking into account several unique characteristics of this new market place. This thesis establishes an economic rationale to the vision of wide-scale deployment of microgrids serving residential communities in near future and develops a comprehensive understanding of microgrid electricity market. A novel concept of Community Microgrids is introduced and the market and business models for electricity transaction are proposed and validated based on economic forecasts of key drivers of distributed generation. The most important contribution of this research deals with establishing a need for a trustworthy model framework for microgrid market and introducing the concept of reputation score to market participants. A framework of day-ahead energy market (DAEM) for electricity transaction, incorporating an approach of using the reputation score to incentivize the sellers in the market to be trustworthy, has been designed and implemented in MATLAB with a graphical user interface (GUI). Current implementation demonstrates a market place with two sellers and nine buyers and is easily scalable to support multiple market participants. The proposed microgrid electricity market may spur the deployment of residential microgrids, incorporating… Advisors/Committee Members: Rahman, Saifur (committeechair), Lu, Chang-Tien (committee member), Pipattanasomporn, Manisa (committee member).

Subjects/Keywords: Trustworthiness; Electricity Transaction; Reputation Score; Community Microgrids

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Krovvidi, S. S. (2010). Competitive Microgrid Electricity Market Design. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/32964

Chicago Manual of Style (16^th Edition):

Krovvidi, Sai S. “Competitive Microgrid Electricity Market Design.” 2010. Masters Thesis, Virginia Tech. Accessed December 15, 2019. http://hdl.handle.net/10919/32964.

MLA Handbook (7^th Edition):

Krovvidi, Sai S. “Competitive Microgrid Electricity Market Design.” 2010. Web. 15 Dec 2019.

Vancouver:

Krovvidi SS. Competitive Microgrid Electricity Market Design. [Internet] [Masters thesis]. Virginia Tech; 2010. [cited 2019 Dec 15]. Available from: http://hdl.handle.net/10919/32964.

Council of Science Editors:

Krovvidi SS. Competitive Microgrid Electricity Market Design. [Masters Thesis]. Virginia Tech; 2010. Available from: http://hdl.handle.net/10919/32964

Virginia Tech

8. Hurtt, James William. Residential Microgrids for Disaster Recovery Operations.

Degree: MS, Electrical and Computer Engineering, 2013, Virginia Tech

URL: http://hdl.handle.net/10919/19242

► The need for a continuous supply of electric power is vital to providing the basic services of modern life. The energy infrastructure that the vast… (more)

Subjects/Keywords: Microgrids; Distributed Generation; Modeling; Disaster Recovery

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hurtt, J. W. (2013). Residential Microgrids for Disaster Recovery Operations. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/19242

Chicago Manual of Style (16^th Edition):

Hurtt, James William. “Residential Microgrids for Disaster Recovery Operations.” 2013. Masters Thesis, Virginia Tech. Accessed December 15, 2019. http://hdl.handle.net/10919/19242.

MLA Handbook (7^th Edition):

Hurtt, James William. “Residential Microgrids for Disaster Recovery Operations.” 2013. Web. 15 Dec 2019.

Vancouver:

Hurtt JW. Residential Microgrids for Disaster Recovery Operations. [Internet] [Masters thesis]. Virginia Tech; 2013. [cited 2019 Dec 15]. Available from: http://hdl.handle.net/10919/19242.

Council of Science Editors:

Hurtt JW. Residential Microgrids for Disaster Recovery Operations. [Masters Thesis]. Virginia Tech; 2013. Available from: http://hdl.handle.net/10919/19242

University of Wollongong

9. Jayawardena, Athmi Vidarshika. Contributions to the development of microgrids: Aggregated modelling and operational aspects.

Degree: PhD, 2015, University of Wollongong

URL: ; https://ro.uow.edu.au/theses/4447

► Increasing levels of penetration of distributed energy resources (DERs) have trans- formed distribution networks from passive to active networks and introduced the concept of… (more)

▼ Increasing levels of penetration of distributed energy resources (DERs) have trans- formed distribution networks from passive to active networks and introduced the concept of microgrids. Dynamic characteristics of microgrids operating either in grid connected or islanded modes can be different from the traditional distribution networks due to the combination of different DERs. In order to make microgrid operation attractive, the issues associated with microgrids need to be properly anal- ysed. This thesis examines the modelling of microgrids and investigates different aspects of their operation. In the first phase of the work presented in this thesis, dynamic characteristics of microgrids comprising different distributed generators are investigated. The importance of understanding the dynamic behaviour of microgrids is highlighted through a comparative analysis carried out on a hybrid microgrid. A simulation model of a hybrid microgrid comprising a PV system, a doubly-fed induction generator (DFIG) based wind power plant, a mini hydro power plant, and loads is developed for the analysis. This study revealed that the dynamic characteristics of the microgrid are significantly influenced by the characteristics of individual DERs and their control systems. It has been noted that during grid connected mode, features of the external grid also have an impact on microgrid behaviour. The second phase of this thesis is focused on aggregated modelling of grid connected microgrids comprising both inverter interfaced and non-inverter interfaced DERs. For stability analysis, the common practice is to separate the power sys- tem into a study area of interest and external areas. In general, the study area is represented in a detailed manner while external areas are represented by dynamic equivalents. This thesis investigates the applicability of modal analysis as a tool for dynamic model equivalencing of grid connected hybrid microgrids while introducing a new index to identify the dominant modes of the system. The grid connected microgrid is represented as a single dynamic device while retaining the important dynamics. Linearised models of different DERs with control systems and loads are developed for this study. Several case studies are carried out to validate the reduced order dynamic model of the microgrid by testing under different operating conditions. Furthermore, the model equivalencing is applied on microgrids in a multi-microgrid environment to validate the methodology. Similar to the large generators in conventional power systems, grid connected microgrids have the potential to participate in energy markets to achieve technical, financial and environmental benefits. In order to enable such operation, a systematic approach in developing a capability tool for a grid connected microgrid is presented in the next phase of this thesis. A grid connected microgrid can be viewed as a single generator or a load depending on power import or export at the grid supply point. However, unlike in a single…

Subjects/Keywords: Microgrids; aggregated modelling; capability diagrams; distributed generation

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Jayawardena, A. V. (2015). Contributions to the development of microgrids: Aggregated modelling and operational aspects. (Doctoral Dissertation). University of Wollongong. Retrieved from ; https://ro.uow.edu.au/theses/4447

Chicago Manual of Style (16^th Edition):

Jayawardena, Athmi Vidarshika. “Contributions to the development of microgrids: Aggregated modelling and operational aspects.” 2015. Doctoral Dissertation, University of Wollongong. Accessed December 15, 2019. ; https://ro.uow.edu.au/theses/4447.

MLA Handbook (7^th Edition):

Jayawardena, Athmi Vidarshika. “Contributions to the development of microgrids: Aggregated modelling and operational aspects.” 2015. Web. 15 Dec 2019.

Vancouver:

Jayawardena AV. Contributions to the development of microgrids: Aggregated modelling and operational aspects. [Internet] [Doctoral dissertation]. University of Wollongong; 2015. [cited 2019 Dec 15]. Available from: ; https://ro.uow.edu.au/theses/4447.

Council of Science Editors:

Jayawardena AV. Contributions to the development of microgrids: Aggregated modelling and operational aspects. [Doctoral Dissertation]. University of Wollongong; 2015. Available from: ; https://ro.uow.edu.au/theses/4447

University of South Carolina

10. Fan, Yuanyuan. Distributed Optimization Method for Intelligent Control of DC Microgrids.

Degree: PhD, Electrical Engineering, 2017, University of South Carolina

URL: https://scholarcommons.sc.edu/etd/4275

► Most of the distributed energy resources, loads and energy storage systems in a DC microgrid are equipped with power electronic converters. With the integration… (more)

▼ Most of the distributed energy resources, loads and energy storage systems in a DC microgrid are equipped with power electronic converters. With the integration of advanced power electronics devices, a microgrid is able to utilize a broader range of technologies in its design and operation. A key feature of power electronic converter based systems is the ability to direct energy flow within a system with their coordinated operation. A system level control is needed for coordination where converters execute reference points dictated by a system-level control in order to achieve system level goals. System goals can be expressed as a cost function solved by a real-time optimization algorithm. This work develops a framework for the coordinated operation of converters with a distributed optimization method for use in a real-time system-level control system. In order to validate the optimization based control method developed in this research, a simplified shipboard DC power distribution system is used for case studies. It is an isolated microgrid with converters between all sources of energy and the main buses as well as between all load centers and the main buses. The example cost function used in the study minimizes distribution losses in the DC power system. Initially, the optimization problem is solved using a centralized method in order to provide a baseline for evaluating other schemes. Primal-dual interior point method is applied successfully to provide optimal operating points. The centralized structure relies on one central controller to support the entire system control such that the system is vulnerable to single points of failure and not easily expandable. To address the robustness and expandability shortcomings, a distributed coordinating optimization algorithm is developed. The coupling constraints formed by nodal current balance result in control variable coupling, therefore, techniques are required to perform an appropriate decomposition. The main task of this dissertation is to develop a practical distributed algorithm via the decomposition of the optimization problem. The method developed here combines dual decomposition and Alternating Direction Method of Multipliers (ADMM) together. This is an iterative based method. By utilizing a decomposition method, the microgrid is partitioned into multiple subsystems. The global target is achieved by interaction of the subsystems which operate on local information. The solutions from the decomposition method and centralized method are compared in diagrams and in numbers using the shipboard DC microgrid test system. Results show that the numerical results from both methods match closely. Analysis of the effect of the number of microgrid subsystem partitions on convergence speed of the decomposition method is also performed. Advisors/Committee Members: Herbert L. Ginn.

Subjects/Keywords: Electrical and Computer Engineering; Engineering; DC Microgrids

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Fan, Y. (2017). Distributed Optimization Method for Intelligent Control of DC Microgrids. (Doctoral Dissertation). University of South Carolina. Retrieved from https://scholarcommons.sc.edu/etd/4275

Chicago Manual of Style (16^th Edition):

Fan, Yuanyuan. “Distributed Optimization Method for Intelligent Control of DC Microgrids.” 2017. Doctoral Dissertation, University of South Carolina. Accessed December 15, 2019. https://scholarcommons.sc.edu/etd/4275.

MLA Handbook (7^th Edition):

Fan, Yuanyuan. “Distributed Optimization Method for Intelligent Control of DC Microgrids.” 2017. Web. 15 Dec 2019.

Vancouver:

Fan Y. Distributed Optimization Method for Intelligent Control of DC Microgrids. [Internet] [Doctoral dissertation]. University of South Carolina; 2017. [cited 2019 Dec 15]. Available from: https://scholarcommons.sc.edu/etd/4275.

Council of Science Editors:

Fan Y. Distributed Optimization Method for Intelligent Control of DC Microgrids. [Doctoral Dissertation]. University of South Carolina; 2017. Available from: https://scholarcommons.sc.edu/etd/4275

University of New South Wales

11. Azim, Mohammad Imran. Islanded Operation of Parallel Inverter-interfaced Microgrids with Photovoltaic Systems.

Degree: Engineering & Information Technology, 2017, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/57376 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:43340/SOURCE02?view=true

► This thesis presents autonomous droop-based control schemes to share power proportionally in inverter-connected islanded microgrids; in which different microgrid structures such as inductive (L-type), resistive… (more)

▼ This thesis presents autonomous droop-based control schemes to share power proportionally in inverter-connected islanded microgrids; in which different microgrid structures such as inductive (L-type), resistive (R-type), and resistive-inductive (RL-type) are considered. The main aim of designing new controllers in this dissertation is to distribute the load change among intermittent distributed generators according to their power ratings.A linearized model of microgrids is used to evaluate the change in powers (real-reactive) of the distributed generators due to the load change, but it is noticed that the linearized modeling of microgrids depends on the distribution line parameters. Thus, proportional power sharing cannot be maintained. Improved droop-based algorithms are developed to share power based on droop gains by including a voltage control law; in which the reference values of the generator voltages are kept the same.A compensation-based droop control is provided by adding a power offset to the real power for balancing the inverter output power during the variation in the output of distributed generation. A derivative term is also included in droop algorithms for damping the oscillatory modes of the controllers so that improved dynamic performance can be ensured.This thesis contains eigenvalue analysis to predict the stability of microgrids. However, it is anticipated that this method may not provide satisfactory results in large inverter-dominated systems as it is based on the quasi-static approximation. In order to overcome this shortcoming, an extended dynamic phasors analysis is described in this dissertation in details to find out a suitable stability range of droop gains for the proposed controllers.Finally, the performance of the designed droop-based power sharing controller is verified on a multi photovoltaic source-based islanded test microgrid and superior dynamic performance is obtained compared with the conventional RL-type droop controller. Advisors/Committee Members: Pota, Hemanshu, Engineering & Information Technology, UNSW Canberra, UNSW.

Subjects/Keywords: Proportional Sharing; Droop Control; Islanded Microgrids

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Azim, M. I. (2017). Islanded Operation of Parallel Inverter-interfaced Microgrids with Photovoltaic Systems. (Masters Thesis). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/57376 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:43340/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Azim, Mohammad Imran. “Islanded Operation of Parallel Inverter-interfaced Microgrids with Photovoltaic Systems.” 2017. Masters Thesis, University of New South Wales. Accessed December 15, 2019. http://handle.unsw.edu.au/1959.4/57376 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:43340/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Azim, Mohammad Imran. “Islanded Operation of Parallel Inverter-interfaced Microgrids with Photovoltaic Systems.” 2017. Web. 15 Dec 2019.

Vancouver:

Azim MI. Islanded Operation of Parallel Inverter-interfaced Microgrids with Photovoltaic Systems. [Internet] [Masters thesis]. University of New South Wales; 2017. [cited 2019 Dec 15]. Available from: http://handle.unsw.edu.au/1959.4/57376 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:43340/SOURCE02?view=true.

Council of Science Editors:

Azim MI. Islanded Operation of Parallel Inverter-interfaced Microgrids with Photovoltaic Systems. [Masters Thesis]. University of New South Wales; 2017. Available from: http://handle.unsw.edu.au/1959.4/57376 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:43340/SOURCE02?view=true

Colorado State University

12. Panwar, Mayank. Operation of electric microgrids under uncertainty.

Degree: PhD, Electrical and Computer Engineering, 2017, Colorado State University

URL: http://hdl.handle.net/10217/181307

► Optimization and decision-making are non-trivial in case of multiple, incommensurable, and conflicting objectives. Decision-making becomes more complicated with uncertainty in inputs. Power system operation with… (more)

▼ Optimization and decision-making are non-trivial in case of multiple, incommensurable, and conflicting objectives. Decision-making becomes more complicated with uncertainty in inputs. Power system operation with electric microgrids subsumes all of the abovementioned aspects. Centralized decision-making in day-ahead dispatch of microgrids with multiple objectives in a grid-connected mode is addressed from the perspective of a power distribution system operator. Uncertainties in the electrical output of variable distributed energy resources and load demand due to forecasting errors are treated statistically by using empirical distributions. Scenarios for simulation are generated using statistics of actual data for solar and load demand forecast. Kantorovich distance measure is used for scenario reduction to maintain computational tractability of the problem. Discrete compromise programming is used for multi-criteria decision-analysis to obtain non-dominated dispatch solutions without generating a computationally expensive Pareto front. Two step look-ahead dynamic program routine is used for dispatch optimization of dispatchable, non-dispatchable solar, and energy storage asset. New performance metrics are developed for reserve management in microgrids using North American Electric Reliability Corporation (NERC) metrics and some previously developed metrics by this researcher. The economic dispatch problem is formulated as a constrained optimization problem with the new metric for reserve as a constraint. Optimization programs are implemented using MATLAB® and power system simulations are performed on standard IEEE 13-node test distribution feeder using the real-time simulation platform—RTDS®. Some potential future developments and applications of performance metrics are presented as future work. Advisors/Committee Members: Suryanarayanan, Siddharth (advisor), Chakraborty, Sudipta (committee member), Hovsapian, Rob O. (committee member), Young, Peter M. (committee member), Zimmerle, Daniel J. (committee member).

Subjects/Keywords: dispatch; microgrids; uncertainty; metrics; decision making; optimization

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Panwar, M. (2017). Operation of electric microgrids under uncertainty. (Doctoral Dissertation). Colorado State University. Retrieved from http://hdl.handle.net/10217/181307

Chicago Manual of Style (16^th Edition):

Panwar, Mayank. “Operation of electric microgrids under uncertainty.” 2017. Doctoral Dissertation, Colorado State University. Accessed December 15, 2019. http://hdl.handle.net/10217/181307.

MLA Handbook (7^th Edition):

Panwar, Mayank. “Operation of electric microgrids under uncertainty.” 2017. Web. 15 Dec 2019.

Vancouver:

Panwar M. Operation of electric microgrids under uncertainty. [Internet] [Doctoral dissertation]. Colorado State University; 2017. [cited 2019 Dec 15]. Available from: http://hdl.handle.net/10217/181307.

Council of Science Editors:

Panwar M. Operation of electric microgrids under uncertainty. [Doctoral Dissertation]. Colorado State University; 2017. Available from: http://hdl.handle.net/10217/181307

13. Tamizi, Khaled. Control of multicellular power converters for microgrids and renewable energies applications : Commande de convertisseurs multicellulaires destinés aux microgrids et aux systèmes d'énergies renouvelables.

Degree: Docteur es, Génie électrique, 2018, Paris Saclay

URL: http://www.theses.fr/2018SACLS212

►

Les convertisseurs multicellulaires DC-DC sont utilisés dans de nombreuses applications et de nombreux systèmes électriques. Ils présentent un intérêt particulier pour des applications spécifiques liées… (more)

▼

Les convertisseurs multicellulaires DC-DC sont utilisés dans de nombreuses applications et de nombreux systèmes électriques. Ils présentent un intérêt particulier pour des applications spécifiques liées aux énergies renouvelables et aux Microgrids. Leur principal avantage provient de leur capacité intrinsèque à réduire les ondulations liées au découpage des grandeurs électriques en entrée et en sortie du système de conversion. Cette propriété intéressante au niveau système peut être étendue au fonctionnement interne du convertisseur en adjoignant à ce dernier un élément de filtrage par inductances couplées magnétiquement. Ce composant permet d’étendre les propriétés externes de réduction des ondulations au fonctionnement de chaque cellule du convertisseur. Il permet également d’augmenter la dynamique propre du système de conversion. Ces propriétés permettent de réduire significativement le niveau et le volume de filtrage en entrée et sortie du convertisseur et donc d’augmenter de manière importante sa compacité et son rendement énergétique. Cependant, l’ajout de ce dispositif magnétique induit, de par le couplage des équations du système qu’il provoque, une complexification du contrôle de la structure associée également à la nécessité d’augmenter le nombre de capteurs.Ce travail de thèse a pour objectif d’établir et d’évaluer différents modes de contrôle pour les convertisseurs multicellulaires DC-DC. Le point commun aux méthodes proposées est de permettre la gestion aussi bien des grandeurs externes au convertisseur que des grandeurs internes constituées par les courants de circulation entre cellules connectées en parallèle. Ces composantes de courant sont également nommées « courants différentiels ». Trois types de contrôle sont étudiés : Pour le premier, des correcteurs linéaires classiques sont utilisés conjointement avec des techniques de découplage des équations du système. La robustesse de ces méthodes de contrôle vis-à-vis des incertitudes sur la connaissance des paramètres du système fait l’objet d’un focus particulier dans cette partie du travail. Pour le second, une version modifiée de la technique de commande connue sous le nom Model Predictive Control est proposée. Celle-ci permet d’assurer le contrôle de la fréquence de commutation et l’entrelacement des commandes PWM des cellules. Pour le troisième mode, nous étudions une méthode basée sur le contrôle vectoriel direct des courants différentiels.Une implantation sur un système numérique équipé d’un micro-processeur et d’un FPGA est proposée et permet de valider les résultats de l’étude théorique.

The interleaved multicell DC-DC power converters are broadly used in many applications and systems especially in renewable energy systems and microgrids. They reduce the current ripple at the input and output side. Also, an implemented magnetic coupling between cells leads to reduce the current ripple in each of them and to improve the dynamical electrical behavior. These properties involve a reduction on the filtering requirements and so, allow to improve…

Advisors/Committee Members: Labouré, Eric (thesis director), Bethoux, Olivier (thesis director).

Subjects/Keywords: Electronique de puissance; Commande; Énergie renouvelable; Microgrids; MPC; Power Electronics; Control; Renewable Energy; Microgrids; MPC

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Tamizi, K. (2018). Control of multicellular power converters for microgrids and renewable energies applications : Commande de convertisseurs multicellulaires destinés aux microgrids et aux systèmes d'énergies renouvelables. (Doctoral Dissertation). Paris Saclay. Retrieved from http://www.theses.fr/2018SACLS212

Chicago Manual of Style (16^th Edition):

Tamizi, Khaled. “Control of multicellular power converters for microgrids and renewable energies applications : Commande de convertisseurs multicellulaires destinés aux microgrids et aux systèmes d'énergies renouvelables.” 2018. Doctoral Dissertation, Paris Saclay. Accessed December 15, 2019. http://www.theses.fr/2018SACLS212.

MLA Handbook (7^th Edition):

Tamizi, Khaled. “Control of multicellular power converters for microgrids and renewable energies applications : Commande de convertisseurs multicellulaires destinés aux microgrids et aux systèmes d'énergies renouvelables.” 2018. Web. 15 Dec 2019.

Vancouver:

Tamizi K. Control of multicellular power converters for microgrids and renewable energies applications : Commande de convertisseurs multicellulaires destinés aux microgrids et aux systèmes d'énergies renouvelables. [Internet] [Doctoral dissertation]. Paris Saclay; 2018. [cited 2019 Dec 15]. Available from: http://www.theses.fr/2018SACLS212.

Council of Science Editors:

Tamizi K. Control of multicellular power converters for microgrids and renewable energies applications : Commande de convertisseurs multicellulaires destinés aux microgrids et aux systèmes d'énergies renouvelables. [Doctoral Dissertation]. Paris Saclay; 2018. Available from: http://www.theses.fr/2018SACLS212

14. Martinez Bolaños, Julio Romel. Análise da estabilidade dinâmica em minirredes com controle autônomo de frequência e tensão.

Degree: PhD, Sistemas de Potência, 2012, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/3/3143/tde-03072013-144136/ ;

►

Cargas e fontes elétricas de pequeno porte, integradas através de alimentadores de distribuição de baixa tensão, agrupadas e gerenciadas de tal maneira que se comportem… (more)

▼

Cargas e fontes elétricas de pequeno porte, integradas através de alimentadores de distribuição de baixa tensão, agrupadas e gerenciadas de tal maneira que se comportem como uma única entidade controlável dentro de um sistema de potência e com a capacidade de operar de forma paralela ou isolada da rede elétrica convencional, constituem-se em um novo tipo de sistema elétrico conhecido como Minirrede. Esta tese aborda o problema relacionado à estabilidade dinâmica de Minirredes com controle autônomo de frequência e tensão, quando operadas de forma isolada da rede convencional. As minirredes analisadas são compostas por combinações de fontes elétricas convencionais e fontes alternativas que não geram naturalmente em 50 ou 60 Hz, sendo necessária a utilização de inversores para sua conexão com a rede elétrica. A análise se realiza no espaço de estados com metodologias baseadas nas teorias que envolvem os autovalores e autovetores da matriz de estado. Para isto, modelos no espaço de estados são desenvolvidos para cada componente da Minirrede, mantendo um compromisso entre precisão e complexidade. O caráter analítico da análise permite investigar a relação entre a estabilidade da Minirrede e os parâmetros do sistema, tais como ganhos dos controladores, dimensionamento da rede, configurações de geração, entre outros. Análises complementares de sensibilidade dos autovalores aos parâmetros elétricos do sistema permitem inferir o comportamento dinâmico de diversas configurações de Minirredes, obtendo-se importantes conclusões à respeito. Os resultados analíticos são verificados através de simulação computacional no ambiente Simulink/Matlab®.

Electrical loads and small power sources, integrated through low voltage distribution feeders, managed in such a way to behave as one controllable entity within in a power system, and with the ability to operate connected or non-connected to the conventional power system is a new kind of electrical system known as Microgrid. This thesis addresses the problem related to dynamic stability of island Microgrids with autonomous control of frequency and voltage. The Microgrids analyzed are composed of combinations of conventional and alternative power sources that do not generate electricity naturally in 50 or 60 Hz, therefore inverters are needed to provide AC network interface. The analysis is performed in the state space with methodologies based on theories involving the eigenvalues and eigenvectors of the state matrix. For this, state-space models are developed for each component of Microgrid, maintaining a compromise between accuracy and complexity. The analytical nature of this study allows investigating the relationship between the stability of Microgrid and parameters of the system, such as controller gains, network design, generation architectures, among others. Complementary sensitivity analyzes of eigenvalues to the electrical parameters of the system allow us to infer the dynamic behavior of various configurations of Microgrids, obtaining important conclusions on the matter. The…

Advisors/Committee Members: Fadigas, Eliane Aparecida Faria Amaral.

Subjects/Keywords: Dynamic stability; Estabilidade dinâmica; Inversores; Inverters; Microgrids; Minirrede

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Martinez Bolaños, J. R. (2012). Análise da estabilidade dinâmica em minirredes com controle autônomo de frequência e tensão. (Doctoral Dissertation). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/3/3143/tde-03072013-144136/ ;

Chicago Manual of Style (16^th Edition):

Martinez Bolaños, Julio Romel. “Análise da estabilidade dinâmica em minirredes com controle autônomo de frequência e tensão.” 2012. Doctoral Dissertation, University of São Paulo. Accessed December 15, 2019. http://www.teses.usp.br/teses/disponiveis/3/3143/tde-03072013-144136/ ;.

MLA Handbook (7^th Edition):

Martinez Bolaños, Julio Romel. “Análise da estabilidade dinâmica em minirredes com controle autônomo de frequência e tensão.” 2012. Web. 15 Dec 2019.

Vancouver:

Martinez Bolaños JR. Análise da estabilidade dinâmica em minirredes com controle autônomo de frequência e tensão. [Internet] [Doctoral dissertation]. University of São Paulo; 2012. [cited 2019 Dec 15]. Available from: http://www.teses.usp.br/teses/disponiveis/3/3143/tde-03072013-144136/ ;.

Council of Science Editors:

Martinez Bolaños JR. Análise da estabilidade dinâmica em minirredes com controle autônomo de frequência e tensão. [Doctoral Dissertation]. University of São Paulo; 2012. Available from: http://www.teses.usp.br/teses/disponiveis/3/3143/tde-03072013-144136/ ;

Texas A&M University

15. Chen, Bo. Black Start Restoration for Electric Distribution Systems and Microgrids.

Degree: 2017, Texas A&M University

URL: http://hdl.handle.net/1969.1/161665

► Modern power systems face increased risk of wide area blackouts caused by extreme weather events, man-made errors, cyber-attacks, and other threats. In order to promptly… (more)

▼ Modern power systems face increased risk of wide area blackouts caused by extreme weather events, man-made errors, cyber-attacks, and other threats. In order to promptly restore power after a blackout, an efficient black start restoration methodology should be developed. Emerging smart grid technologies such as remote control switches (RCSs) and distributed energy resources (DERs) present significant potential that can be leveraged for developing advanced black start restoration methodologies. In this dissertation research, a new black start restoration (BSR) method, which could be used in distribution management system (DMS) or microgrid control center (MGCC), was presented. The BSR problem was formulated as a dynamic optimization problem in order to coordinate the dispatching actions of DERs and the switching actions of RCSs over multiple decision time steps. Several linearization techniques were presented to reformulate the dynamic optimization model as a mixed-integer linear programming (MILP) model. The rolling-horizon functionality was used to reduce the computation time. The MILP mode was simulated in MATLAB? using YALMIP Toolbox and solved in the IBM CPLEXTM solver. Several case studies were conducted to illustrate how the new BSR method works on the modified IEEE 13 node and 123 node systems installed with dispatchable distributed generations (DGs), renewable DGs, energy storage systems (ESSs), and RCSs. OpenDSS was used to simulate power flow, and PSCAD?/EMTDC? was used to simulate frequency response. The new BSR method was able to generate black start sequences in response to varying operating conditions such as balanced and unbalanced conditions, cold load pick up (CLPU) conditions, and different fault scenarios. The performance of the new BSR method was analyzed through extensive case studies. It was observed that using properly selected rolling-horizon parameters could reduce the computation time and achieve near-optimal solutions. However, some operating conditions resulted in infeasible solutions, such as limited DG ramp rate and capacity, heavy loading conditions, and excessive fluctuation of renewable DG outputs and load demands. The new BSR method can be further improved by incorporating a method for determining the rolling-horizon parameters without conducting exhaustive case studies and developing an integrated structure to coordinate with DG primary controls. Advisors/Committee Members: Butler-Purry, Karen (advisor), Xie, Le (committee member), Hou, I-Hong (committee member), Butenko, Sergiy (committee member).

Subjects/Keywords: black start restoration; distribution systems; microgrids; dynamic optimization

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Chen, B. (2017). Black Start Restoration for Electric Distribution Systems and Microgrids. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/161665

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chen, Bo. “Black Start Restoration for Electric Distribution Systems and Microgrids.” 2017. Thesis, Texas A&M University. Accessed December 15, 2019. http://hdl.handle.net/1969.1/161665.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chen, Bo. “Black Start Restoration for Electric Distribution Systems and Microgrids.” 2017. Web. 15 Dec 2019.

Vancouver:

Chen B. Black Start Restoration for Electric Distribution Systems and Microgrids. [Internet] [Thesis]. Texas A&M University; 2017. [cited 2019 Dec 15]. Available from: http://hdl.handle.net/1969.1/161665.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chen B. Black Start Restoration for Electric Distribution Systems and Microgrids. [Thesis]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/161665

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Technology, Sydney

16. Hu, Jiefeng. Advanced control in smart microgrids.

Degree: 2013, University of Technology, Sydney

URL: http://hdl.handle.net/10453/24079

► This thesis presents various advanced control strategies in smart microgrid applications. In recent years, due to the rapid depletion of fossil fuels, increasing demand of… (more)

▼ This thesis presents various advanced control strategies in smart microgrid applications. In recent years, due to the rapid depletion of fossil fuels, increasing demand of electricity, and more strict compulsory government policies on reduction of greenhouse gas emissions, renewable energy technologies are attracting more and more attentions and various types of distributed generation (DG) sources, such as wind turbine generators and solar photovoltaic (PV) panels, are being connected to low-voltage distribution networks. Because of the intermittent nature of the renewable energy sources, it would be a good idea to connect these DG units together with energy storage units and loads to form a local micro power system, known as microgrid. This PhD thesis project aims to develop new and competitive control methods for microgrid applications. Based on a review of the state of the art of the wind power techniques, a new predictive direct control strategy of doubly fed induction generator is proposed. This method can achieve fast and smooth grid synchronization, and after grid connection, the active and reactive power can be regulated flexibly, which enables the wind power systems contributing to the grid voltage support and power quality improvement. The proposed strategy is simple and reliable, and presents excellent steady-state and dynamic performance. A new control approach using the model predictive scheme is developed for a PV system in microgrid applications. In the islanded operation, the inverter output voltage is controlled stably for the local loads. A simple synchronization scheme is introduced to achieve seamless transfer, and after being connected to the utility grid, the PV system can inject both active and reactive power into the grid flexibly within its capacity. As the capacity of DGs getting larger, the power conversion efficiency becomes more important. In order to reduce the switching loss, a multi-objective model-predictive control strategy is proposed for the control of high power converters. By revising the cost function properly, the switching frequency can be reduced considerably without deteriorating the system performance. The control strategy is simplified using a graphical algorithm to reduce the computational burden, which is very useful in practical digital implementation where high sampling frequency is required. The proposed method is very flexible and can be employed in both AC/DC and DC/AC energy conversions in microgrids. For a microgrid consisting of several DG units, various system level control methods are studied. A novel flux droop control approach is developed for parallel-connected DGs by drooping the inverter flux instead of drooping the inverter output voltage. The proposed method can achieve autonomous active and reactive power sharing with much lower frequency deviation and better transient performance than the conventional voltage droop method. Besides, it includes a direct flux control (DFC) algorithm, which avoids the use of proportional-integral (PI) controllers and…

Subjects/Keywords: Microgrids.; Smart grids.; Direct power control.; Power converters.; Renewable power generation.

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hu, J. (2013). Advanced control in smart microgrids. (Thesis). University of Technology, Sydney. Retrieved from http://hdl.handle.net/10453/24079

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hu, Jiefeng. “Advanced control in smart microgrids.” 2013. Thesis, University of Technology, Sydney. Accessed December 15, 2019. http://hdl.handle.net/10453/24079.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hu, Jiefeng. “Advanced control in smart microgrids.” 2013. Web. 15 Dec 2019.

Vancouver:

Hu J. Advanced control in smart microgrids. [Internet] [Thesis]. University of Technology, Sydney; 2013. [cited 2019 Dec 15]. Available from: http://hdl.handle.net/10453/24079.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hu J. Advanced control in smart microgrids. [Thesis]. University of Technology, Sydney; 2013. Available from: http://hdl.handle.net/10453/24079

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Cape Peninsula University of Technology

17. Du Plooy, Henri. Comparative strategies for efficient control and storage of renewable energy in a microgrid .

Degree: 2016, Cape Peninsula University of Technology

URL: http://etd.cput.ac.za/handle/20.500.11838/2486

► Power fluctuations in a microgrid are caused by disturbances due to the connection and disconnection of Distributed Generators (DG’s), as well as the irregular input… (more)

Subjects/Keywords: Renewable energy sources; Energy storage; Microgrids (Smart power grids)

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Du Plooy, H. (2016). Comparative strategies for efficient control and storage of renewable energy in a microgrid . (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/2486

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Du Plooy, Henri. “Comparative strategies for efficient control and storage of renewable energy in a microgrid .” 2016. Thesis, Cape Peninsula University of Technology. Accessed December 15, 2019. http://etd.cput.ac.za/handle/20.500.11838/2486.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Du Plooy, Henri. “Comparative strategies for efficient control and storage of renewable energy in a microgrid .” 2016. Web. 15 Dec 2019.

Vancouver:

Du Plooy H. Comparative strategies for efficient control and storage of renewable energy in a microgrid . [Internet] [Thesis]. Cape Peninsula University of Technology; 2016. [cited 2019 Dec 15]. Available from: http://etd.cput.ac.za/handle/20.500.11838/2486.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Du Plooy H. Comparative strategies for efficient control and storage of renewable energy in a microgrid . [Thesis]. Cape Peninsula University of Technology; 2016. Available from: http://etd.cput.ac.za/handle/20.500.11838/2486

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

UCLA

18. Huang, Rui. Integration of Renewable Distributed Energy Resources into Microgrids.

Degree: Mechanical Engineering, 2015, UCLA

URL: http://www.escholarship.org/uc/item/2m37f7pv

► Although the existing traditional power grid can maintain an instantaneous balance between supply and demand, it is constantly facing many problems such as energy crisis,… (more)

Subjects/Keywords: Mechanical engineering; Distributed Generation; Microgrids; Renewable Energy Resources

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Huang, R. (2015). Integration of Renewable Distributed Energy Resources into Microgrids. (Thesis). UCLA. Retrieved from http://www.escholarship.org/uc/item/2m37f7pv

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Huang, Rui. “Integration of Renewable Distributed Energy Resources into Microgrids.” 2015. Thesis, UCLA. Accessed December 15, 2019. http://www.escholarship.org/uc/item/2m37f7pv.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Huang, Rui. “Integration of Renewable Distributed Energy Resources into Microgrids.” 2015. Web. 15 Dec 2019.

Vancouver:

Huang R. Integration of Renewable Distributed Energy Resources into Microgrids. [Internet] [Thesis]. UCLA; 2015. [cited 2019 Dec 15]. Available from: http://www.escholarship.org/uc/item/2m37f7pv.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Huang R. Integration of Renewable Distributed Energy Resources into Microgrids. [Thesis]. UCLA; 2015. Available from: http://www.escholarship.org/uc/item/2m37f7pv

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Tennessee – Knoxville

19. Azim, Md Riyasat. Management of Islanded Operation of Microgirds.

Degree: 2017, University of Tennessee – Knoxville

URL: https://trace.tennessee.edu/utk_graddiss/4380

► Distributed generations with continuously growing penetration levels offer potential solutions to energy security and reliability with minimum environmental impacts. Distributed Generations when connected to the… (more)

▼ Distributed generations with continuously growing penetration levels offer potential solutions to energy security and reliability with minimum environmental impacts. Distributed Generations when connected to the area electric power systems provide numerous advantages. However, grid integration of distributed generations presents several technical challenges which has forced the systems planners and operators to account for the repercussions on the distribution feeders which are no longer passive in the presence of distributed generations. Grid integration of distributed generations requires accurate and reliable islanding detection methodology for secure system operation. Two distributed generation islanding detection methodologies are proposed in this dissertation. First, a passive islanding detection technique for grid-connected distributed generations based on parallel decision trees is proposed. The proposed approach relies on capturing the underlying signature of a wide variety of system events on a set of critical system parameters and utilizes multiple optimal decision tress in a parallel network for classification of system events. Second, a hybrid islanding detection method for grid-connected inverter based distributed generations combining decision trees and Sandia frequency shift method is also proposed. The proposed method combines passive and active islanding detection techniques to aggregate their individual advantages and reduce or eliminate their drawbacks. In smart grid paradigm, microgrids are the enabling engine for systematic integration of distributed generations with the utility grid. A systematic approach for controlled islanding of grid-connected microgrids is also proposed in this dissertation. The objective of the proposed approach is to develop an adaptive controlled islanding methodology to be implemented as a preventive control component in emergency control strategy for microgrid operations. An emergency power management strategy for microgrid autonomous operation subsequent to inadvertent islanding events is also proposed in this dissertation. The proposed approach integrates microgrid resources such as energy storage systems, demand response resources, and controllable micro-sources to layout a comprehensive power management strategy for ensuring secure and stable microgrid operation following an unplanned islanding event. In this dissertation, various case studies are presented to validate the proposed methods. The simulation results demonstrate the effectiveness of the proposed methodologies.

Subjects/Keywords: Distributed Generations; Microgrids; Islanding Detection; Power Management; Power and Energy

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Azim, M. R. (2017). Management of Islanded Operation of Microgirds. (Doctoral Dissertation). University of Tennessee – Knoxville. Retrieved from https://trace.tennessee.edu/utk_graddiss/4380

Chicago Manual of Style (16^th Edition):

Azim, Md Riyasat. “Management of Islanded Operation of Microgirds.” 2017. Doctoral Dissertation, University of Tennessee – Knoxville. Accessed December 15, 2019. https://trace.tennessee.edu/utk_graddiss/4380.

MLA Handbook (7^th Edition):

Azim, Md Riyasat. “Management of Islanded Operation of Microgirds.” 2017. Web. 15 Dec 2019.

Vancouver:

Azim MR. Management of Islanded Operation of Microgirds. [Internet] [Doctoral dissertation]. University of Tennessee – Knoxville; 2017. [cited 2019 Dec 15]. Available from: https://trace.tennessee.edu/utk_graddiss/4380.

Council of Science Editors:

Azim MR. Management of Islanded Operation of Microgirds. [Doctoral Dissertation]. University of Tennessee – Knoxville; 2017. Available from: https://trace.tennessee.edu/utk_graddiss/4380

Stellenbosch University

20. Terblanche, Wynand Dreyer. Development and application of intelligent histogram logger for load profiling applications.

Degree: MEng, Electrical and Electronic Engineering, 2018, Stellenbosch University

URL: http://hdl.handle.net/10019.1/103610

►

ENGLISH ABSTRACT: Over the past few years, rising electricity cost has increasingly put focus on energy management and energy efficient interventions with the aim at… (more)

▼

ENGLISH ABSTRACT: Over the past few years, rising electricity cost has increasingly put focus on energy management and energy efficient interventions with the aim at consuming electrical energy sustainably and decrease dependency on fossil fuels. Energy management and energy conservation exercises, however, require accurate and reliable load-specific energy consumption data and statistics. To date, high costs of logging instrumentation and data communication remains the restrictive aspect for acquiring statistically significant distributed load modelling data. Conventional long-term measuring instrumentation is, furthermore, highly intrusive which motivates research in non-intrusive load modelling and emphasizes the limiting factor towards energy management exercises. This project provides a solution for modern large-scale load monitoring studies by proposing a low-cost event-based histogram logger. Several studies in the literature where investigated to develop a cost-effective alternative logging device with the aim at design objectives such as low-cost hardware, power efficiency, small physical footprint and non-intrusive current sensing. The proposed system is thoroughly discussed in terms of the system topology, firmware design and the implementation of application software. Numerous methods of data acquisition are investigated to find the optimal recording technique that satisfies the requirements of energy management exercises. Histogram data logging is studied and introduced as an attempt to reduce non-volatile memory requirements in modern data loggers. The application software, which offers a user-friendly interface to assist in setting up the logger, as well as retrieving and presenting data, is presented. Performance results are also presented for the power consumption characteristics of the design. Energy management interventions give rise to the implementation of renewable energy sources and micro-grid energy systems. The proposed system has been studied in the case study using an islanded micro-grid energy system. Historical data is provided for the photovoltaic power plant, battery storage system and diesel generator energy system, while the proposed loggers were installed at certain targeted residential appliances to gather usage data. Simulation software is presented, together with mathematical formulations, to determine various energy profiles and possible energy saving opportunities. The results of the case study proof the concept of histogram event recording and feasibility of implementing the proposed system for energy management exercises.

AFRIKAANSE OPSOMMING: Oor die afgelope paar jaar het stygende elektrisiteitskoste toenemende fokus op energie bestuur en energie-effektiewe ontwikkelinge geplaas. Die doel daarvan is om elektriese energie meer effektief te gebruik en ons afhanklikheid van fossielbrandstowwe te verminder. Energie bestuur en energie-effektiewe ontwikkelinge vereis egter akkurate en betroubare energie verbruikers data. Tot op hede, bly die hoë koste van data versameling…

Advisors/Committee Members: Vermeulen, H. J., Stellenbosch University. Faculty of Engineering. Dept. of Electrical and Electronic Engineering..

Subjects/Keywords: UCTD; Energy conservation; Microgrids (Smart power grids); Electronic data loggers

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Terblanche, W. D. (2018). Development and application of intelligent histogram logger for load profiling applications. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/103610

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Terblanche, Wynand Dreyer. “Development and application of intelligent histogram logger for load profiling applications.” 2018. Thesis, Stellenbosch University. Accessed December 15, 2019. http://hdl.handle.net/10019.1/103610.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Terblanche, Wynand Dreyer. “Development and application of intelligent histogram logger for load profiling applications.” 2018. Web. 15 Dec 2019.

Vancouver:

Terblanche WD. Development and application of intelligent histogram logger for load profiling applications. [Internet] [Thesis]. Stellenbosch University; 2018. [cited 2019 Dec 15]. Available from: http://hdl.handle.net/10019.1/103610.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Terblanche WD. Development and application of intelligent histogram logger for load profiling applications. [Thesis]. Stellenbosch University; 2018. Available from: http://hdl.handle.net/10019.1/103610

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Virginia Tech

21. Diagne, Ibrahima. Dynamic Analysis and Control of Multi-machine Power System with Microgrids: A Koopman Mode Analysis Approach.

Degree: PhD, Electrical and ComputerEngineering, 2017, Virginia Tech

URL: http://hdl.handle.net/10919/84546

► Electric power systems are undergoing significant changes with the deployment of large-scale wind and solar plants connected to the transmission system and small-scale Distributed Energy… (more)

▼ Electric power systems are undergoing significant changes with the deployment of large-scale wind and solar plants connected to the transmission system and small-scale Distributed Energy Resources (DERs) and microgrids connected to the distribution system, making the latter an active system. A microgrid is a small-scale power system that interconnects renewable and non-renewable generating units such as solar photo-voltaic panels and micro-turbines, storage devices such as batteries and fly wheels, and loads. Typically, it is connected to the distribution feeders via power electronic converters with fast control responses within the micro-seconds. These new developments have prompted growing research activities in stability analysis and control of the transmission and the distribution systems. Unfortunately, these systems are treated as separated entities, limiting the scope of the applicability of the proposed methods to real systems. It is worth stressing that the transmission and distribution systems are interconnected via HV/MV transformers and therefore, are interacting dynamically in a complex way. In this research work, we overcome this problem by investigating the dynamics of the transmission and distribution systems with parallel microgrids as an integrated system . Specifically, we develop a generic model of a microgrid that consists of a DC voltage source connected to an inverter with real and reactive power control and voltage control. We analyze the small-signal stability of the two-area four-machine system with four parallel microgrids connected to the distribution feeders though different impedances. We show that the conventional PQ control of the inverters is insufficient to stabilize the voltage at the point-of-common coupling when the feeder impedances have highly unequal values. To ensure the existence of a stable equilibrium point associated with a sufficient stability margin of the system, we propose a new voltage control implemented as an additional feedback control loop of the conventional inner and outer current control schemes of the inverter. Furthermore, we carry out a modal analysis of the four-machine system with microgrids using Koopman mode analysis. We reveal the existence of local modes of oscillation of a microgrid against the rest of the system and between parallel microgrids at frequencies that range between 0.1 and 3 Hz. When the control of the microgrid becomes unstable, the frequencies of the oscillation are about 20 Hz. Recall that the Koopman mode analysis is a new technique developed in fluid dynamics and recently introduced in power systems by Suzuki and Mezic. It allows us to carry out small signal and transient stability analysis by processing only measurements, without resorting to any model and without assuming any linearization. Advisors/Committee Members: Centeno, Virgilio A. (committeechair), Mili, Lamine M. (committeechair), Lai, Jih S. (committee member), Broadwater, Robert P. (committee member), Urken, Arnold (committee member).

Subjects/Keywords: Microgrids; Voltage Control; Modal Analysis; Koopman Mode Analysis

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Diagne, I. (2017). Dynamic Analysis and Control of Multi-machine Power System with Microgrids: A Koopman Mode Analysis Approach. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/84546

Chicago Manual of Style (16^th Edition):

Diagne, Ibrahima. “Dynamic Analysis and Control of Multi-machine Power System with Microgrids: A Koopman Mode Analysis Approach.” 2017. Doctoral Dissertation, Virginia Tech. Accessed December 15, 2019. http://hdl.handle.net/10919/84546.

MLA Handbook (7^th Edition):

Diagne, Ibrahima. “Dynamic Analysis and Control of Multi-machine Power System with Microgrids: A Koopman Mode Analysis Approach.” 2017. Web. 15 Dec 2019.

Vancouver:

Diagne I. Dynamic Analysis and Control of Multi-machine Power System with Microgrids: A Koopman Mode Analysis Approach. [Internet] [Doctoral dissertation]. Virginia Tech; 2017. [cited 2019 Dec 15]. Available from: http://hdl.handle.net/10919/84546.

Council of Science Editors:

Diagne I. Dynamic Analysis and Control of Multi-machine Power System with Microgrids: A Koopman Mode Analysis Approach. [Doctoral Dissertation]. Virginia Tech; 2017. Available from: http://hdl.handle.net/10919/84546

Virginia Tech

22. Bhela, Siddharth. A Game-theoretic Framework to Investigate Conditions for Cooperation between Wind Power Producers and Energy Storage Operators.

Degree: MS, Electrical and Computer Engineering, 2015, Virginia Tech

URL: http://hdl.handle.net/10919/52026

► Game theory has its applications in various domains, but has only recently been applied to study open problems in smart microgrids. A simple microgrid system… (more)

Subjects/Keywords: Game Theory; Wind Power; Energy Storage; Electricity Markets; Smart Microgrids; Optimization

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Bhela, S. (2015). A Game-theoretic Framework to Investigate Conditions for Cooperation between Wind Power Producers and Energy Storage Operators. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/52026

Chicago Manual of Style (16^th Edition):

Bhela, Siddharth. “A Game-theoretic Framework to Investigate Conditions for Cooperation between Wind Power Producers and Energy Storage Operators.” 2015. Masters Thesis, Virginia Tech. Accessed December 15, 2019. http://hdl.handle.net/10919/52026.

MLA Handbook (7^th Edition):

Bhela, Siddharth. “A Game-theoretic Framework to Investigate Conditions for Cooperation between Wind Power Producers and Energy Storage Operators.” 2015. Web. 15 Dec 2019.

Vancouver:

Bhela S. A Game-theoretic Framework to Investigate Conditions for Cooperation between Wind Power Producers and Energy Storage Operators. [Internet] [Masters thesis]. Virginia Tech; 2015. [cited 2019 Dec 15]. Available from: http://hdl.handle.net/10919/52026.

Council of Science Editors:

Bhela S. A Game-theoretic Framework to Investigate Conditions for Cooperation between Wind Power Producers and Energy Storage Operators. [Masters Thesis]. Virginia Tech; 2015. Available from: http://hdl.handle.net/10919/52026

University of Melbourne

23. Kolluri, Ramachandra Rao. Operating converter interfaced microgrids.

Degree: 2016, University of Melbourne

URL: http://hdl.handle.net/11343/191670

► Microgrids have potential applications for both developing as well as developed countries. In developed countries, microgrid deployment can help in lowering carbon-dioxide emissions and increasing… (more)

▼ Microgrids have potential applications for both developing as well as developed countries. In developed countries, microgrid deployment can help in lowering carbon-dioxide emissions and increasing resiliency of the electricity network. In developing countries, microgrids can be used to improve rural electrification levels. The microgrid trend is going to disrupt the traditional energy generation paradigm of monolithic generation. This thesis addresses some challenges that arise with the evolution of microgrids. Microgrids are small sections of the electrical network that comprises of local generation and load. Microgrids, by definition, must be able to operate in isolation from the main grid. In isolated operation, the coordination between sources is very important to achieve stability and ensure operational longevity. Two control hierarchies are popular in microgrid design: 1) master-slave control, and 2) master-less control. These controls are implemented on the sources' power electronic converters. In master-slave control based microgrids, sizing and operating storage systems in combination with local generation is deemed beneficial for reasons like, facilitating pre-meter consumption and leveraging the time-of-use price arbitrage. In this thesis, a model of radial master slave microgrid network with distributed generation and storage is developed. The model developed can be readily adopted to DC master-slave microgrids as well as AC master-slave microgrids with high power factor. Using this model, a central optimization algorithm is proposed. This algorithm allows users to size, position and operate batteries in an intelligent manner where all the network constraints are satisfied and the network costs (capital + operational) are minimized. On solving the problem as a mixed integer linear program (MILP) we obtain appropriate battery sizing decisions at each house in the network and their intended temporal charging and discharging profiles. We extend our results using Monte-Carlo simulation based analysis to address forecasting errors in generation and demand. On the other hand, the design and operation of master-less converter-based microgrids depend on various factors. Little explored is the effect of component mismatches and parameters drifts on the stability and power sharing properties of these systems. On this subject, this works also aims to comprehend the stability and steady state behaviour of multi-master converter based microgrid systems under the presence of non-identical components and parameter drifts. It is shown that microgrid wellness is very sensitive to such changes. We propose a set of coordination controls based on sparse (inter-node) communications to improve the stability margin and ensuring desired power sharing properties. Stability conditions are developed using Lyapunov's indirect method. The performance of the proposed microgrid design is verified using simulation results. For master-slave microgrids, the proposed optimization algorithm improves the economics of microgrid…

Subjects/Keywords: microgrids; distributed generation; frequency and voltage stability; battery optimization

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kolluri, R. R. (2016). Operating converter interfaced microgrids. (Doctoral Dissertation). University of Melbourne. Retrieved from http://hdl.handle.net/11343/191670

Chicago Manual of Style (16^th Edition):

Kolluri, Ramachandra Rao. “Operating converter interfaced microgrids.” 2016. Doctoral Dissertation, University of Melbourne. Accessed December 15, 2019. http://hdl.handle.net/11343/191670.

MLA Handbook (7^th Edition):

Kolluri, Ramachandra Rao. “Operating converter interfaced microgrids.” 2016. Web. 15 Dec 2019.

Vancouver:

Kolluri RR. Operating converter interfaced microgrids. [Internet] [Doctoral dissertation]. University of Melbourne; 2016. [cited 2019 Dec 15]. Available from: http://hdl.handle.net/11343/191670.

Council of Science Editors:

Kolluri RR. Operating converter interfaced microgrids. [Doctoral Dissertation]. University of Melbourne; 2016. Available from: http://hdl.handle.net/11343/191670

University of Tennessee – Knoxville

24. Smith, Montie Edwin, Jr. Evaluation of IEEE 802.1 Time Sensitive Networking Performance for Microgrid and Smart Grid Power System Applications.

Degree: MS, Electrical Engineering, 2018, University of Tennessee – Knoxville

URL: https://trace.tennessee.edu/utk_gradthes/5104

► Proliferation of distributed energy resources and the importance of smart energy management has led to increased interest in microgrids. A microgrid is an area of… (more)

▼ Proliferation of distributed energy resources and the importance of smart energy management has led to increased interest in microgrids. A microgrid is an area of the grid that can be disconnected and operated independently from the main grid when required and can generate some or all of its own energy needs with distributed energy resources and battery storage. This allows for the microgrid area to continue operating even when the main grid is unavailable. In addition, often a microgrid can utilize waste heat from energy generation to drive thermal loads, further improving energy utilization. This leads to increased reliability and overall efficiency in the microgrid area.As microgrids (and by extension the smart grid) become more widespread, new methods of communication and control are required to aid in management of many different distributed entities. One such communication architecture that may prove useful is the set of IEEE 802.1 Time Sensitive Networking (TSN) standards. These standards specify improvements and new capabilities for LAN based communication networks that previously made them unsuitable for widespread deployment in a power system setting. These standards include specifications for low latency guarantees, clock synchronization, data frame redundancy, and centralized system administration. These capabilities were previously available on proprietary or application specific solutions. However, they will now be available as part of the Ethernet standard, enabling backwards compatibility with existing network architecture and support with future advances.Two of the featured standards, IEEE 802.1AS (governing time-synchronization) and IEEE 802.1Qbv (governing time aware traffic shaping), will be tested and evaluated for their potential utility in power systems and microgrid applications. These tests will measure the latency achievable using TSN over a network at various levels of congestion and compare these results with UDP and TCP protocols. In addition, the ability to use synchronized clocks to generate waveforms for microgrid inverter synchronization will be explored. Advisors/Committee Members: Leon M. Tolbert, Qing Charles Cao, Fei Wang.

Subjects/Keywords: Time Sensitive Networking; Microgrids; LAN; TSN; 802.1AS; 802.1Qbv

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Smith, Montie Edwin, J. (2018). Evaluation of IEEE 802.1 Time Sensitive Networking Performance for Microgrid and Smart Grid Power System Applications. (Thesis). University of Tennessee – Knoxville. Retrieved from https://trace.tennessee.edu/utk_gradthes/5104

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Smith, Montie Edwin, Jr. “Evaluation of IEEE 802.1 Time Sensitive Networking Performance for Microgrid and Smart Grid Power System Applications.” 2018. Thesis, University of Tennessee – Knoxville. Accessed December 15, 2019. https://trace.tennessee.edu/utk_gradthes/5104.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Smith, Montie Edwin, Jr. “Evaluation of IEEE 802.1 Time Sensitive Networking Performance for Microgrid and Smart Grid Power System Applications.” 2018. Web. 15 Dec 2019.

Vancouver:

Smith, Montie Edwin J. Evaluation of IEEE 802.1 Time Sensitive Networking Performance for Microgrid and Smart Grid Power System Applications. [Internet] [Thesis]. University of Tennessee – Knoxville; 2018. [cited 2019 Dec 15]. Available from: https://trace.tennessee.edu/utk_gradthes/5104.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Smith, Montie Edwin J. Evaluation of IEEE 802.1 Time Sensitive Networking Performance for Microgrid and Smart Grid Power System Applications. [Thesis]. University of Tennessee – Knoxville; 2018. Available from: https://trace.tennessee.edu/utk_gradthes/5104

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Waterloo

25. Farrokhabadi, Mostafa. Primary and Secondary Frequency Control Techniques for Isolated Microgrids.

Degree: 2017, University of Waterloo

URL: http://hdl.handle.net/10012/11206

► Isolated microgrids have been shown to be a reliable and efficient solution to provide energy to remote communities. From the primary control perspective, due to… (more)

▼ Isolated microgrids have been shown to be a reliable and efficient solution to provide energy to remote communities. From the primary control perspective, due to the low system inertia and fast changes in the output power of wind and solar power sources, isolated microgrids' frequency can experience large excursions and thus easily deviate from nominal operating conditions, even when there is sufficient frequency control reserves; hence, it is challenging to maintain frequency around its nominal value. From the secondary control perspective, the generation scheduling of dispatchable units obtained from a conventional Unit Commitment (UC) are considered fixed between two dispatch time intervals, yielding a staircase generation pro file over the UC time horizon; given the high variability of renewable generation output power, committed units participating in frequency regulation would not remain fixed between two time intervals. The present work proposes techniques to address these issues in primary and secondary frequency control in isolated microgrids with high penetration of renewable generation. In this thesis, first, a new frequency control mechanism is developed which makes use of the load sensitivity to operating voltage and can be easily adopted for various types of isolated microgrids. The proposed controller offers various advantages, such as allowing the integration of significant levels of intermittent renewable resources in isolated/islanded microgrids without the need for large energy storage systems, providing fast and smooth frequency regulation with no steady-state error, regardless of the generator control mechanism. The controller requires no extra communication infrastructure and only local voltage and frequency is used as feedback. The performance of the controller is evaluated and validated using PSCAD/EMTDC on a modified version of the CIGRE benchmark; also, small-perturbation stability analysis is carried out to demonstrate the contribution of the proposed controller to system damping. In the second stage of the thesis, a mathematical model of frequency control in isolated microgrids is proposed and integrated into the UC problem. The proposed formulation considers the impact of the frequency control mechanism on the changes in the generation output using a linear model. Based on this model, a novel UC model is developed which yields a more cost e efficient solution for isolated microgrids. The proposed UC is formulated based on a day-ahead scheduling horizon with Model Predictive Control (MPC) approach. To test and validate the proposed UC, the realistic test system used in the first part of the thesis is utilized. The results demonstrate that the proposed UC would reduce the operational costs of isolated microgrids compared to conventional UC methods, at similar complexity levels and computational costs.

Subjects/Keywords: Isolated Microgrids; Frequency Control; Frequency Stability; Unit Commitment

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Farrokhabadi, M. (2017). Primary and Secondary Frequency Control Techniques for Isolated Microgrids. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/11206

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Farrokhabadi, Mostafa. “Primary and Secondary Frequency Control Techniques for Isolated Microgrids.” 2017. Thesis, University of Waterloo. Accessed December 15, 2019. http://hdl.handle.net/10012/11206.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Farrokhabadi, Mostafa. “Primary and Secondary Frequency Control Techniques for Isolated Microgrids.” 2017. Web. 15 Dec 2019.

Vancouver:

Farrokhabadi M. Primary and Secondary Frequency Control Techniques for Isolated Microgrids. [Internet] [Thesis]. University of Waterloo; 2017. [cited 2019 Dec 15]. Available from: http://hdl.handle.net/10012/11206.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Farrokhabadi M. Primary and Secondary Frequency Control Techniques for Isolated Microgrids. [Thesis]. University of Waterloo; 2017. Available from: http://hdl.handle.net/10012/11206

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Waterloo

26. Lara, Jose Daniel. Robust Energy Management Systems for Isolated Microgrids Under Uncertainty.

Degree: 2014, University of Waterloo

URL: http://hdl.handle.net/10012/8796

► Microgrids are small and local clusters of generation and load operated in a coordinated manner. These systems are being enhanced with Smart Grid technologies in… (more)

▼ Microgrids are small and local clusters of generation and load operated in a coordinated manner. These systems are being enhanced with Smart Grid technologies in order to better integrate more Renewable Energy (RE) sources and thus reduce dependency on fossil fuels. This thesis focuses on isolated microgrids, which are characterized by low inertia Distributed Energy Resources (DERs), limited availability of resources, and high correlation of RE sources of the same type, where, variability and uncertainty become significant issues. In order to enhance the operation of microgrids, a mathematical formulation and archi- tecture of a robust Energy Management System (EMS) for isolated microgrids is proposed in this thesis. The developed algorithm is able to manage the uncertainty of RE sources and hedge the system against uncertainty in RE forecast. The proposed strategy addresses uncertainty using Receding Horizon Control (RHC), combined with a two-stage decision- making process with recourse. The first-stage decisions are the Unit Commitment (UC) variables, determined using a Robust Optimization (RO)-based formulation, and solved using a primal cutting-planes algorithm. Also a method based on the historical perfor- mance of the forecasting system is presented for the selection of the uncertainty policy, which represents the decision maker’s risk preference. The second stage refines the dis- patch commands using an Optimal Power Flow (OPF) calculation with a rather detailed model of the microgrid considering relevant system dynamic constraints. The proposed architecture is based on di↵erent look-ahead windows to better account for uncertainty, and obtain a feasible dispatch solution within reasonable computational times. The EMS is tested on a modified CIGRE test system for di↵erent configurations, com- paring the results with respect to deterministic and Stochastic Optimization (SO)-based formulations. The results reflect the e↵ectiveness of the proposed EMS to hedge the sys- tem against uncertainties, improving the system’s level of reserves, and dispatching Energy Storage Systems (ESSs) appropriately, so that the operational costs are reduced. The im- provements are achieved without requiring probabilistic information from the forecasting system, and based on an appropriate definition of the uncertainty set. The results show that the developed architecture and algorithm are compatible with real-time applications.

Subjects/Keywords: power systems; microgrids; robust optimization; optimal power flow; uncertainty

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lara, J. D. (2014). Robust Energy Management Systems for Isolated Microgrids Under Uncertainty. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/8796

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lara, Jose Daniel. “Robust Energy Management Systems for Isolated Microgrids Under Uncertainty.” 2014. Thesis, University of Waterloo. Accessed December 15, 2019. http://hdl.handle.net/10012/8796.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lara, Jose Daniel. “Robust Energy Management Systems for Isolated Microgrids Under Uncertainty.” 2014. Web. 15 Dec 2019.

Vancouver:

Lara JD. Robust Energy Management Systems for Isolated Microgrids Under Uncertainty. [Internet] [Thesis]. University of Waterloo; 2014. [cited 2019 Dec 15]. Available from: http://hdl.handle.net/10012/8796.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lara JD. Robust Energy Management Systems for Isolated Microgrids Under Uncertainty. [Thesis]. University of Waterloo; 2014. Available from: http://hdl.handle.net/10012/8796

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Toronto

27. Singh, Amrit. Phasor Measurement Unit Enabled Power Dispatch and Autonomous Black Start of AC Microgrids.

Degree: 2018, University of Toronto

URL: http://hdl.handle.net/1807/89531

►

The aim of this thesis is to develop a mathematical model and control for black start and power dispatch of AC microgrids powered by converter… (more)

Subjects/Keywords: ac microgrids; black start; Phasor measurement units; 0544

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Singh, A. (2018). Phasor Measurement Unit Enabled Power Dispatch and Autonomous Black Start of AC Microgrids. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/89531

Chicago Manual of Style (16^th Edition):

Singh, Amrit. “Phasor Measurement Unit Enabled Power Dispatch and Autonomous Black Start of AC Microgrids.” 2018. Masters Thesis, University of Toronto. Accessed December 15, 2019. http://hdl.handle.net/1807/89531.

MLA Handbook (7^th Edition):

Singh, Amrit. “Phasor Measurement Unit Enabled Power Dispatch and Autonomous Black Start of AC Microgrids.” 2018. Web. 15 Dec 2019.

Vancouver:

Singh A. Phasor Measurement Unit Enabled Power Dispatch and Autonomous Black Start of AC Microgrids. [Internet] [Masters thesis]. University of Toronto; 2018. [cited 2019 Dec 15]. Available from: http://hdl.handle.net/1807/89531.

Council of Science Editors:

Singh A. Phasor Measurement Unit Enabled Power Dispatch and Autonomous Black Start of AC Microgrids. [Masters Thesis]. University of Toronto; 2018. Available from: http://hdl.handle.net/1807/89531

University of New South Wales

28. Kamankesh, Hamidreza. Stochastic Operation of Reconfigurable Micro-Grids In the presence of Renewable energy Sources and Electric Vehicles.

Degree: Electrical Engineering & Telecommunications, 2019, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/61971 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:57867/SOURCE02?view=true

► According to the recent developments, the application of Renewable Energy Sources (RESs) such as wind, solar, biomass and hydro has become popular especially in the… (more)

▼ According to the recent developments, the application of Renewable Energy Sources (RESs) such as wind, solar, biomass and hydro has become popular especially in the distribution systems. Improved reliability, higher flexibility, less cost and lower emission are some of the main advantages of utilising RESs. Renewable and distributed energy sources such as solar photovoltaic, fuel cells, wind turbines, micro turbines and energy storage devices are expected to play an important role in the electricity supply industry and low carbon economy of near future. Nevertheless, the high utilisation of distributed generating resources and high penetration level of Electric Vehicles (EVs) in the new power systems has caused new challenges from both operation and management perspectives. A part of these challenges is addressed in the form of microgrids (MGs). This thesis aims to investigate the optimal operation and management of renewable MGs in the presence of EVs. In this regard, different RESs, EVs and storage devices are modelled and analysed as integrated parts of a MG. Here, the concept of vehicle2grid (V2G) technology is used to change the EVs role from only mobile loads into mobile storages which can benefit the main grid. To make the analysis more practical, the battery degradation costs due to V2G are included as additional term in the objective function. To improve the MG performance through a more effective scheduling of units, optimal reconfiguration strategy is employed to alter the feeders’ paths and thus change the power flow direction in the system. The simulation results show that reconfigurable MGs can support the electric consumers with lower power losses and costs while providing better power dispatch of units. In the case of congestion, optimal reconfiguration can also help to release the feeder capacity by transferring heavy-loads to other feeders with light-load. The uncertainties associated with MG components such as load demand prediction error, wind turbine output power variations, solar photovoltaic output power forecast errors, EVs charging and discharging characteristics, and market price forecast error are considered using a stochastic framework based on Unscented Transform (UT) method. The simulation results show that the proposed stochastic framework can provide more realistic results while showing better scheduling of units in the MG with lower costs. Finally, the proposed optimisation method could overcome the traditional methods such as genetic algorithm and particle swarm optimisation in the literature. The feasibility and satisfying performance of the proposed methods are shown on several tests systems. Advisors/Committee Members: Zhang, Daming, Electrical Engineering & Telecommunications, Faculty of Engineering, UNSW.

Subjects/Keywords: Storage units; Microgrids; Electric vehicle; Stochastic optimisation; Distributed generation

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kamankesh, H. (2019). Stochastic Operation of Reconfigurable Micro-Grids In the presence of Renewable energy Sources and Electric Vehicles. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/61971 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:57867/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Kamankesh, Hamidreza. “Stochastic Operation of Reconfigurable Micro-Grids In the presence of Renewable energy Sources and Electric Vehicles.” 2019. Doctoral Dissertation, University of New South Wales. Accessed December 15, 2019. http://handle.unsw.edu.au/1959.4/61971 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:57867/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Kamankesh, Hamidreza. “Stochastic Operation of Reconfigurable Micro-Grids In the presence of Renewable energy Sources and Electric Vehicles.” 2019. Web. 15 Dec 2019.

Vancouver:

Kamankesh H. Stochastic Operation of Reconfigurable Micro-Grids In the presence of Renewable energy Sources and Electric Vehicles. [Internet] [Doctoral dissertation]. University of New South Wales; 2019. [cited 2019 Dec 15]. Available from: http://handle.unsw.edu.au/1959.4/61971 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:57867/SOURCE02?view=true.

Council of Science Editors:

Kamankesh H. Stochastic Operation of Reconfigurable Micro-Grids In the presence of Renewable energy Sources and Electric Vehicles. [Doctoral Dissertation]. University of New South Wales; 2019. Available from: http://handle.unsw.edu.au/1959.4/61971 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:57867/SOURCE02?view=true

Victoria University of Wellington

29. Akinyele, Daniel. Techno-Economic and Life-Cycle Impact Analysis of Solar Photovoltaic Microgrid Systems for Off-Grid Communities.

Degree: 2016, Victoria University of Wellington

URL: http://hdl.handle.net/10063/5450

► This thesis proposes Solar Photovoltaic Microgrids (SPMs) for six different remote communities in Nigeria, one from each of the country’s geopolitical zones. The research analysis… (more)

▼ This thesis proposes Solar Photovoltaic Microgrids (SPMs) for six different remote communities in Nigeria, one from each of the country’s geopolitical zones. The research analysis is presented based on the basic load demand of 24 households within each of the selected communities. The arrangements of the houses are obtained from the community’s layout provided by a building consortium. The study first presents the intended users’ basic energy needs and their daily energy usage. The available solar energy resources of the different locations are also carefully examined, in relation to their disparities, intermittent characteristics and seasonal variations. The research also emphasises the possibility of load growth. With such consideration, more practical electrification solutions can be achieved. The study considers users’ electricity demand growth of 25 to 75% of the baseline value of 175 kWh/d. The photovoltaic microgrid systems are modelled in the DIgSILENT PowerFactory environment. The lengths of the lines running from the electric power plant to the households are obtained from the community’s layout. This information is included in the model, coupled with the solar energy data and the technical configurations of the PV arrays. The effectiveness of the proposed SPMs is evaluated by first comparing the techno-economic and environmental assessment results with those of a diesel power plant. This is also done by comparing the results with some existing related outputs in the literature, which are reported for solar photovoltaic systems in different regions of the world. The research results indicate that it is possible to develop practical, cost-effective and reliable clean energy systems for the specified communities based on solar photovoltaic technology. The SPMs have the capability to compete with conventional electricity options – diesel/petrol generators with which some households are already familiar. Furthermore, even though the diesel plant’s initial capital cost is as low as ~ 10 - 17% of those of the SPMs, its life cycle costs are ~ 2 - 2.3 times the life cycle costs of the proposed SPMs for the six locations. Over the 25-year project life span, the SPMs clearly provide a significant economic benefit. The battery average SoC probability distribution values of >98% above the minimum set point of 30% were also achieved. The reliability indices, i.e. LOEP of < 5%, availability of > 95% achieved in this study for the SPMs, are also comparable with the existing results in the literature. The SPM’s estimated emission rate is ~57 gCO₂/kWh, which is lower than the values of 576 - 695 gCO₂/kWh obtained for diesel systems. The SPM system’s GWP ranges from 3,409 to 7,945 kgCO₂-eq. Also, the system’s EPBTs and EROIs range from 1.11 to 1.6 years and 15.63 to 22.52, respectively, of the specified locations. The proposed SPM model is based on the global engineering standards and best practices and has very considerable practical applications. These can provide a reference point for governments, policymakers,… Advisors/Committee Members: Rayudu, Ramesh, Nair, Nirmal, Tan, Rodney.

Subjects/Keywords: Solar microgrids; Solar PV life-cycle impact; Techno-economic analysis

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Akinyele, D. (2016). Techno-Economic and Life-Cycle Impact Analysis of Solar Photovoltaic Microgrid Systems for Off-Grid Communities. (Doctoral Dissertation). Victoria University of Wellington. Retrieved from http://hdl.handle.net/10063/5450

Chicago Manual of Style (16^th Edition):

Akinyele, Daniel. “Techno-Economic and Life-Cycle Impact Analysis of Solar Photovoltaic Microgrid Systems for Off-Grid Communities.” 2016. Doctoral Dissertation, Victoria University of Wellington. Accessed December 15, 2019. http://hdl.handle.net/10063/5450.

MLA Handbook (7^th Edition):

Akinyele, Daniel. “Techno-Economic and Life-Cycle Impact Analysis of Solar Photovoltaic Microgrid Systems for Off-Grid Communities.” 2016. Web. 15 Dec 2019.

Vancouver:

Akinyele D. Techno-Economic and Life-Cycle Impact Analysis of Solar Photovoltaic Microgrid Systems for Off-Grid Communities. [Internet] [Doctoral dissertation]. Victoria University of Wellington; 2016. [cited 2019 Dec 15]. Available from: http://hdl.handle.net/10063/5450.

Council of Science Editors:

Akinyele D. Techno-Economic and Life-Cycle Impact Analysis of Solar Photovoltaic Microgrid Systems for Off-Grid Communities. [Doctoral Dissertation]. Victoria University of Wellington; 2016. Available from: http://hdl.handle.net/10063/5450

University of Minnesota

30. Luo, Ling. Spatio-temporal model reduction of inverter-based islanded microgrids.

Degree: MS, Electrical Engineering, 2014, University of Minnesota

URL: http://hdl.handle.net/11299/162831

► Microgrids, are small foot-print power systems that balance critical loads against available energy supply, and are capable of operating in both grid-connected and islanded operation… (more)

▼ Microgrids, are small foot-print power systems that balance critical loads against available energy supply, and are capable of operating in both grid-connected and islanded operation modes. Numerous factors such as energy assurance, reliability, renewable integration and economics are driving increased research and development in the modeling, analysis and control of microgrids.In intentionally islanded operation, well-established droop control techniques are employed to keep inverters synchronized and regulate frequency and voltage within stability limits in microgrids. Computationally efficient and accurate models that describe droop-controlled inverter dynamics are key to controller design, stability assessment, and performance evaluation of islanded microgrids. Typical models for droop-controlled inverters are very detailed, and include myriad states from internal control loops and filters. Conceivably, control design, numerical simulations, and stability assessment with such models in islanded microgrids comprising tens of or even hundreds of inverters is computationally expensive and do not offer any analytical insights. This calls for the development of reduced-order models of inverter-based microgrids. Model reduction methods can isolate relevant spatio-temporal dynamics and mutual interactions of interest. While model reduction methods have been widely applied in bulk power systems, a systematic model-reduction procedure for droop-controlled islanded inverters has thus far been lacking. The objective of this thesis is to reduce large-signal dynamic models of inverter-based islanded microgrids in both spatial and temporal aspects. Singular perturbation methods are applied for temporal model reduction, and Kron reduction is employed for the spatial model reduction. The ensuing reduced-order models accurately describe the original dynamics with reduced computational burden. In addition, spatial model reduction isolates the mutual inverter interactions and clearly illustrates the equivalent loads that the inverters have to support in the microgrid - this aspect is leveraged in controller design to minimize power losses and voltage deviations.

Subjects/Keywords: Inverter; Islanded mode; Kron reduction; Microgrids; Model reduction; Singular perturbation methods

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Luo, L. (2014). Spatio-temporal model reduction of inverter-based islanded microgrids. (Masters Thesis). University of Minnesota. Retrieved from http://hdl.handle.net/11299/162831

Chicago Manual of Style (16^th Edition):

Luo, Ling. “Spatio-temporal model reduction of inverter-based islanded microgrids.” 2014. Masters Thesis, University of Minnesota. Accessed December 15, 2019. http://hdl.handle.net/11299/162831.

MLA Handbook (7^th Edition):

Luo, Ling. “Spatio-temporal model reduction of inverter-based islanded microgrids.” 2014. Web. 15 Dec 2019.

Vancouver:

Luo L. Spatio-temporal model reduction of inverter-based islanded microgrids. [Internet] [Masters thesis]. University of Minnesota; 2014. [cited 2019 Dec 15]. Available from: http://hdl.handle.net/11299/162831.

Council of Science Editors:

Luo L. Spatio-temporal model reduction of inverter-based islanded microgrids. [Masters Thesis]. University of Minnesota; 2014. Available from: http://hdl.handle.net/11299/162831

		in
And / Or
		in
And / Or
		in
And / Or
		in

Open Access Theses and Dissertations