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Georgia Tech
1.
Bednar, Chad Michael.
Parametric thermal modeling of switched reluctance and induction machines.
Degree: MS, Mechanical Engineering, 2014, Georgia Tech
URL: http://hdl.handle.net/1853/53394 
► This research focuses on the creation of a thermal estimator to be used in an integrated electromagnetic, thermo-mechanical design tool for the rapid optimal initial…
(more)
▼ This research focuses on the creation of a thermal estimator to be used in an integrated electromagnetic, thermo-mechanical design tool for the rapid optimal initial sizing of switched reluctance and induction machines. The switched reluctance model includes heat generation in the rotor due to core losses, heat transfer across the air gap through convection, and a heat transfer path through the shaft to ambient. Empirical Nusselt correlations for laminar shear flow, laminar flow with vortices and turbulent flow are used to estimate the convective heat transfer coefficient in the air gap. The induction model adds ohmic heat generation within the rotor bars of the machine as an additional rotor heat source. A parametric, self-segmenting mesh generation tool was created to capture the complex rotor geometries found within switched reluctance or induction machines. Modeling the rotor slot geometries in the R-θ polar coordinate system proved to be a key challenge in the work. Segmentation algorithms were established to model standard slot geometries including radial, rectangular (parallel-sided), circular and kite-shaped features in the polar coordinate system used in the R-θ solution plane. The center-node mesh generation tool was able optimize the size and number of nodes to accurately capture the cross sectional area of the feature, in the solution plane. The algorithms pursue a tradeoff between computational accuracy and computational speed by adopting a hybrid approach to estimate three dimensional effects. A thermal circuits approach links the R-θ finite difference solution to the three dimensional boundary conditions. The thermal estimator was able to accurately capture the temperature distribution in switched reluctance and induction machines as verified with experimental results.
Advisors/Committee Members: Mayor, J. Rhett R. (advisor), Jeter, Sheldon (committee member), Harley, Ronald (committee member).
Subjects/Keywords: Thermal modeling; Finite difference; Electric machines; Switched reluctance; Induction
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APA (6th Edition):
Bednar, C. M. (2014). Parametric thermal modeling of switched reluctance and induction machines. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/53394
Chicago Manual of Style (16th Edition):
Bednar, Chad Michael. “Parametric thermal modeling of switched reluctance and induction machines.” 2014. Masters Thesis, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/53394.
MLA Handbook (7th Edition):
Bednar, Chad Michael. “Parametric thermal modeling of switched reluctance and induction machines.” 2014. Web. 27 Feb 2021.
Vancouver:
Bednar CM. Parametric thermal modeling of switched reluctance and induction machines. [Internet] [Masters thesis]. Georgia Tech; 2014. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/53394.
Council of Science Editors:
Bednar CM. Parametric thermal modeling of switched reluctance and induction machines. [Masters Thesis]. Georgia Tech; 2014. Available from: http://hdl.handle.net/1853/53394
Georgia Tech
2.
Onyewuchi, Urenna.
Managing environmentally stressed aging assets in electric power utilities.
Degree: PhD, Electrical and Computer Engineering, 2012, Georgia Tech
URL: http://hdl.handle.net/1853/53150
► A model for optimizing the differential cost between a preventive maintenance program and a traditional run-to-failure program on managing assets under uncertainty is developed to…
(more)
▼ A model for optimizing the differential cost between a preventive maintenance program and a traditional run-to-failure program on managing assets under uncertainty is developed to assist electric power utilities in decision-making. The assets studied, though not necessarily critical to power delivery, are so numerous in number that the failures of thousands of them result in millions of dollars in instantaneous replacement cost to the utility. The ages of some of the assets are approaching an excess of one hundred years, the age of commercial electricity in the United States. The developed model includes the economics of inspections and replacements as random variables, where the cost of corrective replacements could significantly exceed the cost of planned or preventive replacements. The model also relies on uncertainties in annual failures and inaccuracy of diagnostics that drive planned replacements. Age-specific fragilities of the assets under environmental stress are assessed, and the likelihood of failures of the assets was found to increase significantly as they approached one hundred years, past some initial age of failures that are comparable to new assets. This finding led to the development of an improved geographical inspection scheme, where only components past that initial age are recommended for diagnostic evaluation. The optimization results suggest that the present net benefit/cost of preventive replacement programs of the electric power utility to the unpopular run-to-failure program can be improved on. This, by using the developed models and adopting the frameworks presented in the research work. Implications for future research are also discussed.
Advisors/Committee Members: Begovic, Miroslav (advisor), DesRoches, Reginald (committee member), Habetler, Thomas (committee member), Mukhopadhyay, Saibal (committee member), Harley, Ronald (committee member).
Subjects/Keywords: Asset management; Environmental stress; Decision making; Electric utility; Aging infrastructure
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APA (6th Edition):
Onyewuchi, U. (2012). Managing environmentally stressed aging assets in electric power utilities. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/53150
Chicago Manual of Style (16th Edition):
Onyewuchi, Urenna. “Managing environmentally stressed aging assets in electric power utilities.” 2012. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/53150.
MLA Handbook (7th Edition):
Onyewuchi, Urenna. “Managing environmentally stressed aging assets in electric power utilities.” 2012. Web. 27 Feb 2021.
Vancouver:
Onyewuchi U. Managing environmentally stressed aging assets in electric power utilities. [Internet] [Doctoral dissertation]. Georgia Tech; 2012. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/53150.
Council of Science Editors:
Onyewuchi U. Managing environmentally stressed aging assets in electric power utilities. [Doctoral Dissertation]. Georgia Tech; 2012. Available from: http://hdl.handle.net/1853/53150
Georgia Tech
3.
Peppanen, Jouni Aleksi.
Improving distribution system model accuracy by leveraging ubiquitous sensors.
Degree: PhD, Electrical and Computer Engineering, 2016, Georgia Tech
URL: http://hdl.handle.net/1853/58179
► To enable advanced distribution automation schemes with ubiquitous distributed energy resources, it is imperative to increase distribution system modeling accuracy and detail, and to manage…
(more)
▼ To enable advanced distribution automation schemes with ubiquitous distributed energy resources, it is imperative to increase distribution system modeling accuracy and detail, and to manage the Big Data from smart meters and other modern distribution system sensors. This dissertation shows accurate and computationally efficient parameter and topology estimation methods to calibrate existing utility distribution system secondary circuit low-voltage models with the modern distribution system sensor data. The methods are shown to be efficient with the
Georgia Tech distribution system with smart meter measurements and with large utility feeder models with advanced PV inverter measurements. This dissertation also shows data validation and data imputation methods to manage the accuracy and reliability issues related to the modern distribution system sensor data. The presented data validation methods were effectively used to detect numerous issues in
Georgia Tech smart meter data. Compared to conventional approaches, the presented data imputation method has a superior average accuracy in imputing
Georgia Tech smart meter measurements. The method is computationally efficient and creates a series of imputed samples that have a continuous profile with respect to the adjacent available measurements, which is a highly desirable feature for time-series analyses.
Advisors/Committee Members: Harley, Ronald G. (advisor), Grijalva, Santiago (committee member), Saeedifard, Maryam (committee member), Meliopoulos, A. P. (committee member), Ahmed, Shabbir (committee member).
Subjects/Keywords: Power distribution; Power system modeling; Parameter estimation; Power system measurements; Power system simulation; Regression analysis; Smart grids
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APA (6th Edition):
Peppanen, J. A. (2016). Improving distribution system model accuracy by leveraging ubiquitous sensors. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/58179
Chicago Manual of Style (16th Edition):
Peppanen, Jouni Aleksi. “Improving distribution system model accuracy by leveraging ubiquitous sensors.” 2016. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/58179.
MLA Handbook (7th Edition):
Peppanen, Jouni Aleksi. “Improving distribution system model accuracy by leveraging ubiquitous sensors.” 2016. Web. 27 Feb 2021.
Vancouver:
Peppanen JA. Improving distribution system model accuracy by leveraging ubiquitous sensors. [Internet] [Doctoral dissertation]. Georgia Tech; 2016. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/58179.
Council of Science Editors:
Peppanen JA. Improving distribution system model accuracy by leveraging ubiquitous sensors. [Doctoral Dissertation]. Georgia Tech; 2016. Available from: http://hdl.handle.net/1853/58179
Georgia Tech
4.
Kim, Suhwan.
Mixed-source charger-supply CMOS IC.
Degree: PhD, Electrical and Computer Engineering, 2014, Georgia Tech
URL: http://hdl.handle.net/1853/52210
► The proposed research objective is to develop, test, and evaluate a mixer and charger-supply CMOS IC that derives and mixes energy and power from mixed…
(more)
▼ The proposed research objective is to develop, test, and evaluate a mixer and charger-supply CMOS IC that derives and mixes energy and power from mixed sources to accurately supply a miniaturized system. Since the energy-dense source stores more energy than the power-dense source while the latter supplies more power than the former, the proposed research aims to develop an IC that automatically selects how much and from which source to draw power to maximize lifetime per unit volume. Today, the state of the art lacks the intelligence and capability to select the most appropriate source from which to extract power to supply the time-varying needs of a small system. As such, the underlying objective and benefit of this research is to reduce the size of a complete electronic system so that wireless sensors and biomedical implants, for example, as a whole, perform well, operate for extended periods, and integrate into tiny spaces.
Advisors/Committee Members: Rincon-Mora, Gabriel A. (advisor), Ghovanloo, Maysam (committee member), Wang, Hua (committee member), Harley, Ronald Gordon (committee member), Kohl, Paul A. (committee member).
Subjects/Keywords: DC-DC converter; CMOS; Power supply; Hybrid source
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APA ·
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APA (6th Edition):
Kim, S. (2014). Mixed-source charger-supply CMOS IC. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/52210
Chicago Manual of Style (16th Edition):
Kim, Suhwan. “Mixed-source charger-supply CMOS IC.” 2014. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/52210.
MLA Handbook (7th Edition):
Kim, Suhwan. “Mixed-source charger-supply CMOS IC.” 2014. Web. 27 Feb 2021.
Vancouver:
Kim S. Mixed-source charger-supply CMOS IC. [Internet] [Doctoral dissertation]. Georgia Tech; 2014. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/52210.
Council of Science Editors:
Kim S. Mixed-source charger-supply CMOS IC. [Doctoral Dissertation]. Georgia Tech; 2014. Available from: http://hdl.handle.net/1853/52210
Georgia Tech
5.
Alquthami, Thamer.
A smart house energy management system.
Degree: PhD, Electrical and Computer Engineering, 2015, Georgia Tech
URL: http://hdl.handle.net/1853/53900
► The impact of distributed energy resources (DERs), electric vehicles/plug-in hybrid electric vehicles (EVs/PHEVs), and smart appliances on the distribution grid has been expected to be…
(more)
▼ The impact of distributed energy resources (DERs), electric vehicles/plug-in hybrid electric vehicles (EVs/PHEVs), and smart appliances on the distribution grid has been expected to be beneficial in terms of environment, economy, and reliability. But, it can be more beneficial by implementing smart controls. In the absence of additional controls, a negative effect was identified regarding the service lifetime of power distribution components. This research presents a new class of a smart house energy management system that can provide management and control of a residential house electric energy without inconvenience to the residents of the house and without overloading the distribution infrastructure. The implementation of these controls requires an infrastructure that continuously monitors the house power system operation, determines the real-time model of the house, computes better operating strategies over a planning period of time, and enables control of house resources. The smart house energy management system provides benefits for the good of utility and customer. In case of variable electricity rates, the management system can reduce the customer’s total energy cost. The benefits can be also extended to provide ancillary services to the utility such as control of peak load and reactive power support– assuming that this is worked out under a certain mutually beneficial arrangement between the utility and customer.
Advisors/Committee Members: Meliopoulos, A. P. Sakis (advisor), Harley, Ronald (committee member), Saeedifard, Maryam (committee member), Zhang, Ying (committee member), Ahmed, Shabbir (committee member).
Subjects/Keywords: Smart grid; Energy management; House energy management; Energy optimization
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APA (6th Edition):
Alquthami, T. (2015). A smart house energy management system. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/53900
Chicago Manual of Style (16th Edition):
Alquthami, Thamer. “A smart house energy management system.” 2015. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/53900.
MLA Handbook (7th Edition):
Alquthami, Thamer. “A smart house energy management system.” 2015. Web. 27 Feb 2021.
Vancouver:
Alquthami T. A smart house energy management system. [Internet] [Doctoral dissertation]. Georgia Tech; 2015. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/53900.
Council of Science Editors:
Alquthami T. A smart house energy management system. [Doctoral Dissertation]. Georgia Tech; 2015. Available from: http://hdl.handle.net/1853/53900
Georgia Tech
6.
Dang, Jie.
Switched reluctance machine electromagnetic design and optimization.
Degree: PhD, Electrical and Computer Engineering, 2015, Georgia Tech
URL: http://hdl.handle.net/1853/53908
► The objective of this dissertation is to study the switched reluctance machine (SRM) electromagnetic design and optimization. The research of electric machines is mostly driven…
(more)
▼ The objective of this dissertation is to study the switched reluctance machine (SRM) electromagnetic design and optimization. The research of electric machines is mostly driven by the motivation for higher efficiency and lower cost. The demands for high-performance electric machines also come from the development of emerging industries, such as electric vehicles (EV), hybrid electric vehicles (HEV), renewable energy conversion, energy storage and precision manufacturing. The additional requirements for those applications include volume, weight, speed, torque, reliability, fault tolerance capability, etc. The focus of the research effort is on the high speed and high torque applications, where the SRM stands out compared to other types of machines. The conventional design method significantly depends on the designer’s experience, which uses equivalent magnetic circuit models, and therefore the SRM design is not well developed.
A novel SRM electromagnetic design and optimization method is developed, which uses the current-fed FEA simulation as the SRM performance estimation tool. This method serves as the main innovation of this research work. First, the proposed method is applicable to any SRM topologies and dimension, and no detailed modeling of a specific SRM configuration is required in advance. Therefore, an automated SRM design and optimization approach is developed. Secondly, great accuracy of the SRM electromagnetic analysis, e.g. flux density, torque, and current calculation, is achieved by using FEA simulation instead of simplified magnetic circuit approximations. This contribution is particularly significant when considering the poor accuracy of conventional SRM analytical analysis methods, where several assumptions and approximations are used. Lastly, the proposed design method takes the typical SRM control strategy into account, where the excitation current profile is characterized as a trapezoid. This method adapts the flux linkage of the first FEA simulation result to specify the excitation current profile for the second FEA simulation, so the calculated SRM performance in FEA simulation agrees with the measurement on a practical machine.
The proposed SRM design and optimization method is used for a 12/8 SRM rotor design and for a complete 4/2 SRM design. These design examples validate the applicability of the proposed method to different SRM configurations and dimensions. Detailed design steps are presented for both design cases, and the selection of the parametric design variables are also discussed. The optimization results are demonstrated using multi-dimension diagrams, where the optimal design with the highest torque can be easily identified. The FEA simulation results are compared to the experimental results of a fabricated SRM prototype, and good agreement is found.
In addition, a new rotor configuration with a flux bridge is proposed for an ultra high speed SRM design. The primary motivation of this rotor topology is to reduce the windgae losses and the acoustic noise at a high speed of 50,000…
Advisors/Committee Members: Harley, Ronald (advisor), Habetler, Thomas (committee member), Mayor, Rhett (committee member), Taylor, David (committee member), Saeedifard, Maryam (committee member).
Subjects/Keywords: Switched reluctance machine; FEA, electromagnetic analysis; High speed machine; Motor drive; Motor control
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APA (6th Edition):
Dang, J. (2015). Switched reluctance machine electromagnetic design and optimization. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/53908
Chicago Manual of Style (16th Edition):
Dang, Jie. “Switched reluctance machine electromagnetic design and optimization.” 2015. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/53908.
MLA Handbook (7th Edition):
Dang, Jie. “Switched reluctance machine electromagnetic design and optimization.” 2015. Web. 27 Feb 2021.
Vancouver:
Dang J. Switched reluctance machine electromagnetic design and optimization. [Internet] [Doctoral dissertation]. Georgia Tech; 2015. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/53908.
Council of Science Editors:
Dang J. Switched reluctance machine electromagnetic design and optimization. [Doctoral Dissertation]. Georgia Tech; 2015. Available from: http://hdl.handle.net/1853/53908
Georgia Tech
7.
Ainsworth, Nathan Grey.
Towards a distributed control regime for robust synchronization and power sharing of inverter-based ac power networks.
Degree: PhD, Electrical and Computer Engineering, 2014, Georgia Tech
URL: http://hdl.handle.net/1853/53985
► The objective of the proposed research is 1) to develop a general dynamic condition sufficient to ensure frequency synchronization of inverter-based AC power networks, and…
(more)
▼ The objective of the proposed research is 1) to develop a general dynamic condition sufficient to ensure frequency synchronization of inverter-based AC power networks, and 2) to develop a distributed control regime that is capable of guaranteeing that the above condition holds for a scalable class of such networks. I will first develop a structure-preserving model of an arbitrary network whose sources are all inverters operating frequency-droop control. By applying graph theoretic methods to the model, I will show that there exists a “safe operating region” of the state space such that if the network angle trajectory stays in this region, then frequency synchronization is shown by Lyapunov-like methods. By analogy to similar problems solved in other applications, I will develop a new distributed control regime to constrain a network of the target class to the safe operating region, thus guaranteeing frequency synchronization. These techniques may form the basis for future development of ultra-reliable, scalable inverter-based networks.
Advisors/Committee Members: Grijalva, Santiago (advisor), Egerstedt, Magnus (committee member), Harley, Ronald (committee member), Saeedifard, Maryam (committee member), Nemirovski, Arkadi (committee member).
Subjects/Keywords: Power systems; Control systems
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APA (6th Edition):
Ainsworth, N. G. (2014). Towards a distributed control regime for robust synchronization and power sharing of inverter-based ac power networks. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/53985
Chicago Manual of Style (16th Edition):
Ainsworth, Nathan Grey. “Towards a distributed control regime for robust synchronization and power sharing of inverter-based ac power networks.” 2014. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/53985.
MLA Handbook (7th Edition):
Ainsworth, Nathan Grey. “Towards a distributed control regime for robust synchronization and power sharing of inverter-based ac power networks.” 2014. Web. 27 Feb 2021.
Vancouver:
Ainsworth NG. Towards a distributed control regime for robust synchronization and power sharing of inverter-based ac power networks. [Internet] [Doctoral dissertation]. Georgia Tech; 2014. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/53985.
Council of Science Editors:
Ainsworth NG. Towards a distributed control regime for robust synchronization and power sharing of inverter-based ac power networks. [Doctoral Dissertation]. Georgia Tech; 2014. Available from: http://hdl.handle.net/1853/53985
Georgia Tech
8.
Reno, Matthew J.
Streamlined interconnection analysis of distributed PV using advanced simulation methods.
Degree: PhD, Electrical and Computer Engineering, 2015, Georgia Tech
URL: http://hdl.handle.net/1853/54896
► With the penetration of PV on the distribution system continually increasing, new advanced simulation methods are necessary to model the potential technical impacts of PV…
(more)
▼ With the penetration of PV on the distribution system continually increasing, new advanced simulation methods are necessary to model the potential technical impacts of PV to the equipment and operation of the distribution system. With distributed PV, a timeseries analysis approach is necessary to more fully capture the time-varying nature of solar energy and the interaction with distribution system operations. The objective of the research is to streamline the PV interconnection process by providing more accurate methods that require less time for both the PV interconnection screening criteria and the PV interconnection impact study process. To improve the computational speed of timeseries simulations, an equivalent circuit reduction method is developed to simplify the circuit to a reduced-order model. The reduced circuit is equivalent during timeseries simulations, but it solves in a fraction of the time. The algorithm works with unbalanced multi-phase complex distribution system models, and it is shown to have high accuracy when validated against the full feeder models. An advanced PV hosting capacity simulation tool is developed and used to quantify system impacts for many PV interconnection scenarios, configurations, and locations, which can be generalized to develop improved future interconnection screening criteria. The advanced tools quantify location-specific impacts and the locational hosting capacity of potential PV interconnection locations on the feeder, including PV impact signatures and zones. A set of 50 different real distribution systems is analyzed in detail to demonstrate the range of scenarios and impacts that can occur depending on the feeder characteristics and topology. Specific methods are developed for time-series analysis, faster simulation times, distribution system equivalent circuit reduction, and PV hosting capacity analysis. The advancements presented in this thesis assist in streamlining PV interconnection studies with faster interconnection analysis times and more accurate screening criteria.
Advisors/Committee Members: Grijalva, Santiago (advisor), Harley, Ronald (committee member), Saeedifard, Maryam (committee member), Meliopoulos, Sakis (committee member), Shelton, Sam (committee member).
Subjects/Keywords: Distributed generation; Interconnection analysis; Distribution simulation; PV impact study
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APA ·
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APA (6th Edition):
Reno, M. J. (2015). Streamlined interconnection analysis of distributed PV using advanced simulation methods. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/54896
Chicago Manual of Style (16th Edition):
Reno, Matthew J. “Streamlined interconnection analysis of distributed PV using advanced simulation methods.” 2015. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/54896.
MLA Handbook (7th Edition):
Reno, Matthew J. “Streamlined interconnection analysis of distributed PV using advanced simulation methods.” 2015. Web. 27 Feb 2021.
Vancouver:
Reno MJ. Streamlined interconnection analysis of distributed PV using advanced simulation methods. [Internet] [Doctoral dissertation]. Georgia Tech; 2015. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/54896.
Council of Science Editors:
Reno MJ. Streamlined interconnection analysis of distributed PV using advanced simulation methods. [Doctoral Dissertation]. Georgia Tech; 2015. Available from: http://hdl.handle.net/1853/54896
Georgia Tech
9.
Hubert, Tanguy F.
Decision-making in the future electricity grid: home energy management, pricing design, and architecture development.
Degree: PhD, Electrical and Computer Engineering, 2015, Georgia Tech
URL: http://hdl.handle.net/1853/54902
► As the number of autonomous decision-making entities in the electricity grid increases, it is necessary to develop (1) new decision-making capabilities embedded within the grid's…
(more)
▼ As the number of autonomous decision-making entities in the electricity grid increases, it is necessary to develop (1) new decision-making capabilities embedded within the grid's control and management, and (2) new grid architecture models ensuring that both individual and system objectives are met. This work develops (1) new decision-making mechanisms enabling residential energy users and electricity providers to interact through the use of dynamic price signals, and (2) policy recommendations to facilitate the emergence of shared architecture models describing the future state of the electricity grid. In the first part, two optimization models that capture the emerging flexible consumption, storage, and generation capabilities of residential end-users are formulated. An economic dispatch model that explicitly accounts for end-users' internal dynamics is proposed. A non-iterative pricing algorithm using convex and inverse linear programming is developed to induce autonomous residential end-users to behave cooperatively and minimize the provider's generation costs. In the second part, several factors that make the development of grid architecture models necessary from a public policy standpoint are identified and discussed. The grid architecture problem is rigorously framed as both a market failure legitimizing government intervention, and a meta-problem requiring the development of non-conventional methods of solution. A policy approach drawing on the theoretical concepts of broker, boundary object and boundary organization is proposed.
Advisors/Committee Members: Grijalva, Santiago (advisor), Harley, Ronald (committee member), Norton, Bryan (committee member), Tovey, Craig A. (committee member), Goodman, Seymour (committee member).
Subjects/Keywords: Home energy management; Electricity pricing; Inverse linear programming; Energy prosumers; Grid architecture
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APA (6th Edition):
Hubert, T. F. (2015). Decision-making in the future electricity grid: home energy management, pricing design, and architecture development. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/54902
Chicago Manual of Style (16th Edition):
Hubert, Tanguy F. “Decision-making in the future electricity grid: home energy management, pricing design, and architecture development.” 2015. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/54902.
MLA Handbook (7th Edition):
Hubert, Tanguy F. “Decision-making in the future electricity grid: home energy management, pricing design, and architecture development.” 2015. Web. 27 Feb 2021.
Vancouver:
Hubert TF. Decision-making in the future electricity grid: home energy management, pricing design, and architecture development. [Internet] [Doctoral dissertation]. Georgia Tech; 2015. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/54902.
Council of Science Editors:
Hubert TF. Decision-making in the future electricity grid: home energy management, pricing design, and architecture development. [Doctoral Dissertation]. Georgia Tech; 2015. Available from: http://hdl.handle.net/1853/54902
Georgia Tech
10.
Liu, Nan.
Design of a universal inductive charging system for electric vehicles.
Degree: PhD, Electrical and Computer Engineering, 2015, Georgia Tech
URL: http://hdl.handle.net/1853/54917
► A promising method for charging batteries of electric vehicles (EV) is inductive power transfer (IPT), also known as inductive charging. IPT, a convenient, safe, and…
(more)
▼ A promising method for charging batteries of electric vehicles (EV) is inductive power transfer (IPT), also known as inductive charging. IPT, a convenient, safe, and aesthetic method of charging EVs, inductively transfers high-frequency AC power in the transmitting pad, or coil, to the receiving pad, or coil. However, the application of IPT entails several practical limitations. For example, misalignment of the coils and varied charging distance (air gap) between the coils change the magnetic coupling effect between the transmitting and receiving coils. As a result, system stability decreases because the electrical characteristics in different charging cycles vary. Previous research has rarely proposed an adaptive and effective method to solve the problems of varied coupling. Many EV models, however, exist on the market and more will be released in the future. A universal charger suitable for charging various models of EVs will have broad applications, especially in public charging areas. Therefore, we must design a universal inductive charger capable of providing stable charging voltage to various loads, even with influences by varied magnetic coupling. Also important is the design standard of on-board chargers used for universal inductive charging. The design schemes of the universal inductive charger and on-board chargers can be used as references for the future development of the entire EV inductive charging system.
Advisors/Committee Members: Habetler, Thomas G. (advisor), Harley, Ronald G. (committee member), Saeedifard, Maryam (committee member), Graber, Lukas (committee member), Mayor, J. Rhett (committee member).
Subjects/Keywords: Electric vehicles; Inductive charging
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APA (6th Edition):
Liu, N. (2015). Design of a universal inductive charging system for electric vehicles. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/54917
Chicago Manual of Style (16th Edition):
Liu, Nan. “Design of a universal inductive charging system for electric vehicles.” 2015. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/54917.
MLA Handbook (7th Edition):
Liu, Nan. “Design of a universal inductive charging system for electric vehicles.” 2015. Web. 27 Feb 2021.
Vancouver:
Liu N. Design of a universal inductive charging system for electric vehicles. [Internet] [Doctoral dissertation]. Georgia Tech; 2015. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/54917.
Council of Science Editors:
Liu N. Design of a universal inductive charging system for electric vehicles. [Doctoral Dissertation]. Georgia Tech; 2015. Available from: http://hdl.handle.net/1853/54917
Georgia Tech
11.
Taylor, Alyse Michelle.
Informing U.S. Electricity Policy: Independent Data-Driven Policy Tools to Support Regulators, Policy Makers, and Utilities.
Degree: PhD, Electrical and Computer Engineering, 2015, Georgia Tech
URL: http://hdl.handle.net/1853/56213
► Electric grids are undergoing unprecedented changes to accommodate increased social demand for sustainability, better economics, improved reliability and greater efficiency. These transformed grids, or grids…
(more)
▼ Electric grids are undergoing unprecedented changes to accommodate increased social demand for sustainability, better economics, improved reliability and greater efficiency. These transformed grids, or grids in transformation, are often referred to as “Smart Grids”. Achieving the objectives of the Smart Grid will allow the grid to be more flexible and autonomous; enabling it to better use current resources and respond to the needs of consumers. The objective of this dissertation is to study and understand U.S. Smart Grid progress, identify problems in Smart Grid development, and propose data-driven tools to help utilities and regulators address those problems. Three tools are proposed in this research (1) a Smart Grid development metric and (2) an electric utility business model framework and (3) an electric utility business model financial tool.
The dissertation is split into three segments. The first segment of the dissertation assesses U.S. Smart Grid progress based on information gathered directly from industry stakeholders. In that assessment eight areas were studied in depth and seven key recommendations were made. The second segment of the dissertation addresses the first recommendation identified in the Smart Grid assessment; a lack of specific Smart Grid goals and success metrics. This dissertation presents the Smart Grid development metric as a potential solution to this problem. The development metric solution is composed of twelve indicators that comprehensively measure Smart Grid progress either over time or in comparison to other nations/states. The third segment of the dissertation addresses the second problem identified; determining the appropriate way to calculate the costs and benefits of renewable generation and Smart Grid technology. The changes prompted by the Smart Grid challenge many of the traditional electric utility methods for conducting business. This dissertation work creates an electric utility business model framework as a potential solution to this problem. The electric utility business model framework is intended to help utilities determine new ways to create value around Smart Grid technology and opportunities. The electric utility business financial tool is intended to assist utilities in understanding the possible financial implications of the new value streams generated from the electric utility business model framework.
Advisors/Committee Members: Grijalva, Santiago (advisor), Thomas, Valerie M. (committee member), Harley, Ronald (committee member), Saeedifard, Maryam (committee member), Goodman, Seymour (committee member).
Subjects/Keywords: Smart Grid; metrics; policy; OECD; electric utility; business model; indicator; finance model; electricity; United States; electric grid
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APA (6th Edition):
Taylor, A. M. (2015). Informing U.S. Electricity Policy: Independent Data-Driven Policy Tools to Support Regulators, Policy Makers, and Utilities. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/56213
Chicago Manual of Style (16th Edition):
Taylor, Alyse Michelle. “Informing U.S. Electricity Policy: Independent Data-Driven Policy Tools to Support Regulators, Policy Makers, and Utilities.” 2015. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/56213.
MLA Handbook (7th Edition):
Taylor, Alyse Michelle. “Informing U.S. Electricity Policy: Independent Data-Driven Policy Tools to Support Regulators, Policy Makers, and Utilities.” 2015. Web. 27 Feb 2021.
Vancouver:
Taylor AM. Informing U.S. Electricity Policy: Independent Data-Driven Policy Tools to Support Regulators, Policy Makers, and Utilities. [Internet] [Doctoral dissertation]. Georgia Tech; 2015. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/56213.
Council of Science Editors:
Taylor AM. Informing U.S. Electricity Policy: Independent Data-Driven Policy Tools to Support Regulators, Policy Makers, and Utilities. [Doctoral Dissertation]. Georgia Tech; 2015. Available from: http://hdl.handle.net/1853/56213
Georgia Tech
12.
Chen, Hao.
Soft-switching solid state transformer (S4T).
Degree: PhD, Electrical and Computer Engineering, 2016, Georgia Tech
URL: http://hdl.handle.net/1853/56279
► Solid state transformer is a device that can convert single- or multi-phase AC to another single or multi-phase AC or DC with high-frequency isolation between…
(more)
▼ Solid state transformer is a device that can convert single- or multi-phase AC to another single or multi-phase AC or DC with high-frequency isolation between the input and the output. It provides features of bidirectional power flow control, reactive power compensation, harmonics suppression, voltage regulation, sag correction, and fault isolation. Conventional topologies to implement the SST have issues of complex multi-stage structure, high device count, hard-switching with severe parasitic impact, low efficiency, and poor reliability. This research proposed a novel soft-switching solid state transformer (S4T) topology, which has the features of: 1) minimal power conversion stage with low device count, 2) soft-switching feature for all devices over the full load range, 3) fully bidirectional active and reactive power flow control with voltage buck and boost capability, 4) arbitrary power factors and frequencies for input/output, 5) eliminating large DC capacitors to avoid inrush and to improve reliability, 6) fast dynamic response to transients, 7) ease of control to achieve soft-switching operation, 8) flexible configurations for two- or multi-terminal DC, single- and multi-phase AC systems such that it acts as a universal power converter, and 9) modular structure to scale to medium voltage and high power though stacking the converter modules.
Advisors/Committee Members: Divan, Deepak M. (advisor), Habetler, Thomas G. (committee member), Saeedifard, Maryam (committee member), Harley, Ronald G. (committee member), Mayor, Rhett (committee member).
Subjects/Keywords: Soft switching; ZVS; High-frequency isolation; Bidirectional power control; Solid state transformer; DC; Single-phase AC; Three-phase AC; Multi-terminal; High-frequency transformer
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APA (6th Edition):
Chen, H. (2016). Soft-switching solid state transformer (S4T). (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/56279
Chicago Manual of Style (16th Edition):
Chen, Hao. “Soft-switching solid state transformer (S4T).” 2016. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/56279.
MLA Handbook (7th Edition):
Chen, Hao. “Soft-switching solid state transformer (S4T).” 2016. Web. 27 Feb 2021.
Vancouver:
Chen H. Soft-switching solid state transformer (S4T). [Internet] [Doctoral dissertation]. Georgia Tech; 2016. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/56279.
Council of Science Editors:
Chen H. Soft-switching solid state transformer (S4T). [Doctoral Dissertation]. Georgia Tech; 2016. Available from: http://hdl.handle.net/1853/56279
Georgia Tech
13.
Tan, Zhenyu.
Dynamic state estimation based transmission line protection.
Degree: PhD, Electrical and Computer Engineering, 2016, Georgia Tech
URL: http://hdl.handle.net/1853/56306
► This thesis proposed a dynamic state estimation based protection algorithm for the transmission line to 1) eliminate complex protection settings in order to prevent human…
(more)
▼ This thesis proposed a dynamic state estimation based protection algorithm for the transmission line to 1) eliminate complex protection settings in order to prevent human errors, 2) fulfill the protection gaps caused by legacy protection functions, and as a result, reduce relay misoperations. The dynamic model of the line is first converted into an equivalent algebraic companion form by quadratic integration. Then three dynamic state estimation algorithms and the protection logic based on the estimation results are introduced for the protection purpose. The proposed algorithm is compared with legacy protection functions in test cases to demonstrate the effectiveness of the proposed algorithm in high impedance fault case, external close fault case, current reversal case, current inversion case, voltage inversion case, etc. The impact of instrumentation error to the algorithm is also investigated and integrated modeling of transmission line and instrument transformers is proposed to improve the robustness of dynamic state estimation based protection. The sensitivities of the algorithm related to modeling errors and synchronization errors are also analyzed.
Advisors/Committee Members: Meliopoulos, Sakis (advisor), Harley, Ronald (committee member), Taylor, David (committee member), Zhang, Fumin (committee member), Sun, Andy (committee member).
Subjects/Keywords: Dynamic state estimation; Protective relay
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APA (6th Edition):
Tan, Z. (2016). Dynamic state estimation based transmission line protection. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/56306
Chicago Manual of Style (16th Edition):
Tan, Zhenyu. “Dynamic state estimation based transmission line protection.” 2016. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/56306.
MLA Handbook (7th Edition):
Tan, Zhenyu. “Dynamic state estimation based transmission line protection.” 2016. Web. 27 Feb 2021.
Vancouver:
Tan Z. Dynamic state estimation based transmission line protection. [Internet] [Doctoral dissertation]. Georgia Tech; 2016. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/56306.
Council of Science Editors:
Tan Z. Dynamic state estimation based transmission line protection. [Doctoral Dissertation]. Georgia Tech; 2016. Available from: http://hdl.handle.net/1853/56306
Georgia Tech
14.
Wang, Zhaoyu.
Implementation and assessment of demand response and voltage/var control with distributed generators.
Degree: PhD, Electrical and Computer Engineering, 2015, Georgia Tech
URL: http://hdl.handle.net/1853/53928
► The main topic of this research is the efficient operation of a modernized distribution grid from both the customer side and utility side. For the…
(more)
▼ The main topic of this research is the efficient operation of a modernized distribution grid from both the customer side and utility side. For the customer side, this dissertation discusses the planning and operation of a customer with multiple demand response programs, energy storage systems and distributed generators; for the utility side, this dissertation addresses the implementation and assessment of voltage/VAR control and conservation voltage reduction in a distribution grid with distributed generators.
The objectives of this research are as follows: (1) to develop methods to assist customers to select appropriate demand response programs considering the integration of energy storage systems and DGs, and perform corresponding energy management including dispatches of loads, energy storage systems, and DGs; (2) to develop stochastic voltage/VAR control techniques for distribution grids with renewable DGs; (3) to develop optimization and validation methods for the planning of integration of renewable DGs to assist the implementation of voltage/VAR control; and (4) to develop techniques to assess load-reduction effects of voltage/VAR control and conservation voltage reduction.
In this dissertation, a two-stage co-optimization method for the planning and energy management of a customer with demand response programs is proposed. The first level is to optimally select suitable demand response programs to join and integrate batteries, and the second level is to schedule the dispatches of loads, batteries and fossil-fired backup generators. The proposed method considers various demand response programs, demand scenarios and customer types. It can provide guidance to a customer to make the most beneficial decisions in an electricity market with multiple demand response programs.
For the implementation of voltage/VAR control, this dissertation proposes a stochastic rolling horizon optimization-based method to conduct optimal dispatches of voltage/VAR control devices such as on-load tap changers and capacitor banks. The uncertainties of renewable DG output are taken into account by the stochastic formulation and the generated scenarios. The exponential load models are applied to capture the load behaviors of various types of customers.
A new method to simultaneously consider the integration of DGs and the implementation of voltage/VAR control is also developed. The proposed method includes both solution and validation stages. The planning problem is formulated as a bi-level stochastic program. The solution stage is based on sample average approximation (SAA), and the validation stage is based on multiple replication procedure (MRP) to test the robustness of the sample average approximation solutions of the stochastic program.
This research applies big data-driven analytics and load modeling techniques to propose two novel methodologies to assess the load-reduction effects of conservation voltage reduction. The proposed methods can be used to assist utilities to select preferable feeders to implement conservation…
Advisors/Committee Members: Harley, Ronald G. (advisor), Hampton, Nigel (committee member), Habetler, Thomas (committee member), Grijalva, Santiago (committee member), Saeedifard, Maryam (committee member), Sun, Andy (committee member).
Subjects/Keywords: Demand response; Voltage/var control; Distributed generators; Stochastic optimization; Conservation voltage reduction
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APA ·
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APA (6th Edition):
Wang, Z. (2015). Implementation and assessment of demand response and voltage/var control with distributed generators. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/53928
Chicago Manual of Style (16th Edition):
Wang, Zhaoyu. “Implementation and assessment of demand response and voltage/var control with distributed generators.” 2015. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/53928.
MLA Handbook (7th Edition):
Wang, Zhaoyu. “Implementation and assessment of demand response and voltage/var control with distributed generators.” 2015. Web. 27 Feb 2021.
Vancouver:
Wang Z. Implementation and assessment of demand response and voltage/var control with distributed generators. [Internet] [Doctoral dissertation]. Georgia Tech; 2015. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/53928.
Council of Science Editors:
Wang Z. Implementation and assessment of demand response and voltage/var control with distributed generators. [Doctoral Dissertation]. Georgia Tech; 2015. Available from: http://hdl.handle.net/1853/53928
Georgia Tech
15.
Deng, Yi.
Modulation, control, and applications of multilevel converters for power systems with high penetration of wind energy.
Degree: PhD, Electrical and Computer Engineering, 2016, Georgia Tech
URL: http://hdl.handle.net/1853/55591
► The proposed research focuses on developing modulation and control methods for multilevel converters so as to optimize their applications in wind energy generation and transmission.…
(more)
▼ The proposed research focuses on developing modulation and control methods for multilevel converters so as to optimize their applications in wind energy generation and transmission. This dissertation first establishes the inherent relationship between the space vector modulation (SVM) and a phase-voltage modulation technique (called the nearest-level modulation): the two modulation methods are functionally equivalent. Consequently, a simplified SVM scheme for multilevel converters is proposed, which is independent of the level number of the converter and for the first time achieves the same easy implementation as phase-voltage modulation techniques.
The three-level active neutral-point-clamped (ANPC) converter is well suited to control high-power wind turbine generators, but suffers from unequal power loss distribution among its semiconductor devices. This dissertation proposes a new modulation scheme, called the adaptive doubled frequency PWM (ADF-PWM), to achieve the power loss balancing control for the ANPC converter. In applications of high voltage direct current (HVDC) transmission systems connecting large wind farms over a long distance to a utility network, the modular multilevel converter (MMC) is the best choice, because of its modularity and scalability to meet any voltage level requirements. This dissertation proposes an optimized control method for the MMC based on the proposed simplified SVM scheme, which significantly improves the capacitor voltage balancing and circulating current suppression.
Advisors/Committee Members: Harley, Ronald G (advisor), Habetler, Thomas G (committee member), Saeedifard, Maryam (committee member), Taylor, David G (committee member), Graber, Lukas (committee member), Zhu, Lei (committee member).
Subjects/Keywords: Multilevel converter; pulse width modulation; wind energy
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APA ·
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Export
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APA (6th Edition):
Deng, Y. (2016). Modulation, control, and applications of multilevel converters for power systems with high penetration of wind energy. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/55591
Chicago Manual of Style (16th Edition):
Deng, Yi. “Modulation, control, and applications of multilevel converters for power systems with high penetration of wind energy.” 2016. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/55591.
MLA Handbook (7th Edition):
Deng, Yi. “Modulation, control, and applications of multilevel converters for power systems with high penetration of wind energy.” 2016. Web. 27 Feb 2021.
Vancouver:
Deng Y. Modulation, control, and applications of multilevel converters for power systems with high penetration of wind energy. [Internet] [Doctoral dissertation]. Georgia Tech; 2016. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/55591.
Council of Science Editors:
Deng Y. Modulation, control, and applications of multilevel converters for power systems with high penetration of wind energy. [Doctoral Dissertation]. Georgia Tech; 2016. Available from: http://hdl.handle.net/1853/55591
16.
Taylor, Alyse M.
Policy recommendations to realize the objectives of the future electric grid.
Degree: MS, Electrical and Computer Engineering, 2013, Georgia Tech
URL: http://hdl.handle.net/1853/51759
► The Energy Independence and Security Act of 2007 established that the current electric grid was inadequate to serve the United States needs. Congress mandated that…
(more)
▼ The Energy Independence and Security Act of 2007 established that the current electric grid was inadequate to serve the United States needs. Congress mandated that the U.S. transition to a more intelligent grid for the future. The Department of Energy was tasked with making this goal a reality. Six years later in 2013, only marginal progress has been made. Outside of smart meter rollouts and pilots programs funded through the American Recovery and Reinvestment Act of 2009 (ARRA), many issues still need to be addressed in order to realize the U.S. Smart Grid vision. Most of the barriers to progress are not technological; the research and business community are rising to the occasion and meeting the challenge through innovation. However, policy issues present a large barrier to overcome. With issues ranging from vague Smart Grids goals issued by the Department of Energy to a general lack of consumer knowledge about the Smart Grid. This paper seeks to identify the gaps in the current electric grid and policy schema are inadequate and suggest recommendations to encourage and expedite the growth of the U.S. Smart Grid.
Advisors/Committee Members: Grijalva, Santiago (advisor), Begovic, Miroslav (committee member), Harley, Ronald (committee member).
Subjects/Keywords: Department of Energy (DOE); Smart grid; Electric power systems; Smart power grids
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APA (6th Edition):
Taylor, A. M. (2013). Policy recommendations to realize the objectives of the future electric grid. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/51759
Chicago Manual of Style (16th Edition):
Taylor, Alyse M. “Policy recommendations to realize the objectives of the future electric grid.” 2013. Masters Thesis, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/51759.
MLA Handbook (7th Edition):
Taylor, Alyse M. “Policy recommendations to realize the objectives of the future electric grid.” 2013. Web. 27 Feb 2021.
Vancouver:
Taylor AM. Policy recommendations to realize the objectives of the future electric grid. [Internet] [Masters thesis]. Georgia Tech; 2013. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/51759.
Council of Science Editors:
Taylor AM. Policy recommendations to realize the objectives of the future electric grid. [Masters Thesis]. Georgia Tech; 2013. Available from: http://hdl.handle.net/1853/51759
17.
Sakib, Nazmus.
Effects of incorporating renewable energy sources into the electricity grid.
Degree: MS, Electrical and Computer Engineering, 2014, Georgia Tech
URL: http://hdl.handle.net/1853/53485
► With the increasing demand for energy throughout the world, the environment around us is getting severely affected. The conventional energy sources (coal, oil and gas)…
(more)
▼ With the increasing demand for energy throughout the world, the environment around us is getting severely affected. The conventional energy sources (coal, oil and gas) are unfortunately the biggest polluters of the environment. The aforementioned energy sources emit greenhouse gases like carbon dioxide and methane, which are responsible for global warming and ozone layer depletion.
The only feasible answer to this problem is to reduce the use of the conventional energy sources and focus more on other energy sources. The renewable energy sources (solar, wind and hydro) have been present in nature, but the technology to harvest these energies have always been relatively expensive until recently. The biggest advantage of using renewable energy sources is the fact that these energy sources will never run out and they also do not pollute the environment as their more conventional counterparts.
With more research being conducted into better ways of storing the power trapped from the renewable energy sources and the relative difficulty of obtaining the ever-depleting conventional energy sources, the future for renewable energy sources definitely looks better than at any time in the past
Advisors/Committee Members: Meliopoulos, Antonis P. S. (advisor), Habetler, Thomas G. (committee member), Harley, Ronald G. (committee member).
Subjects/Keywords: Renewable energy; Solar energy
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APA (6th Edition):
Sakib, N. (2014). Effects of incorporating renewable energy sources into the electricity grid. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/53485
Chicago Manual of Style (16th Edition):
Sakib, Nazmus. “Effects of incorporating renewable energy sources into the electricity grid.” 2014. Masters Thesis, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/53485.
MLA Handbook (7th Edition):
Sakib, Nazmus. “Effects of incorporating renewable energy sources into the electricity grid.” 2014. Web. 27 Feb 2021.
Vancouver:
Sakib N. Effects of incorporating renewable energy sources into the electricity grid. [Internet] [Masters thesis]. Georgia Tech; 2014. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/53485.
Council of Science Editors:
Sakib N. Effects of incorporating renewable energy sources into the electricity grid. [Masters Thesis]. Georgia Tech; 2014. Available from: http://hdl.handle.net/1853/53485
18.
Roe, Curtis Aaron.
Impacts of automated residential energy management technology on primary energy source utilization.
Degree: PhD, Electrical and Computer Engineering, 2012, Georgia Tech
URL: http://hdl.handle.net/1853/45865
► The objective of the proposed research is to analyze automated residential energy management technology using primary energy source utilization. A residential energy management system (REMS)…
(more)
▼ The objective of the proposed research is to analyze automated residential energy management technology using primary energy source utilization. A residential energy management system (REMS) is an amalgamation of hardware and software that performs residential energy usage monitoring, planning, and control. Primary energy source utilization quantifies power system levels impacts on power generation cost, fuel utilization, and environmental air pollution; based on power system generating constraints and electric load.
Automated residential energy management technology performance is quantified through a physically-based REMS simulation. This simulation includes individual appliance operation and accounts for consumer behavior by stochastically varying appliance usage and repeating multiple simulation iterations for each simulated scenario. The effect of the automated REMS under varying levels of control will be considered.
Aggregate REMS power system impacts are quantified using primary energy source utilization. This analysis uses a probabilistic economic dispatch algorithm. The economic dispatch algorithm quantifies: fuel usage and subsequent environmental air pollution (EAP) generated; based on power system generating constraints and electric load (no transmission constraints are considered).
The analysis will comprehensively explore multiple residential energy management options to achieve demand response. The physically-based REMS simulation will consider the following control options: programmable thermostat, direct load control, smart appliance scheduling, and smart appliance scheduling with a stationary battery. The ability to compare multiple automated residential energy management technology options on an equal basis will guide utility technology investment strategies.
Advisors/Committee Members: Meliopoulos, Sakis (Committee Chair), Alexopoulos, Christos (Committee Member), Grijalva, Santiago (Committee Member), Harley, Ronald (Committee Member), Yalamanchili, Sudhakar (Committee Member).
Subjects/Keywords: Residential automation; Simulation; Demand response; Demand side management; Electric power systems; Electric power distribution Automation; Electric power systems Load dispatching; Electric power distribution; Smart power grids
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APA (6th Edition):
Roe, C. A. (2012). Impacts of automated residential energy management technology on primary energy source utilization. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/45865
Chicago Manual of Style (16th Edition):
Roe, Curtis Aaron. “Impacts of automated residential energy management technology on primary energy source utilization.” 2012. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/45865.
MLA Handbook (7th Edition):
Roe, Curtis Aaron. “Impacts of automated residential energy management technology on primary energy source utilization.” 2012. Web. 27 Feb 2021.
Vancouver:
Roe CA. Impacts of automated residential energy management technology on primary energy source utilization. [Internet] [Doctoral dissertation]. Georgia Tech; 2012. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/45865.
Council of Science Editors:
Roe CA. Impacts of automated residential energy management technology on primary energy source utilization. [Doctoral Dissertation]. Georgia Tech; 2012. Available from: http://hdl.handle.net/1853/45865
19.
Dai, Jing.
Reservoir-computing-based, biologically inspired artificial neural networks and their applications in power systems.
Degree: PhD, Electrical and Computer Engineering, 2013, Georgia Tech
URL: http://hdl.handle.net/1853/47646
► Computational intelligence techniques, such as artificial neural networks (ANNs), have been widely used to improve the performance of power system monitoring and control. Although inspired…
(more)
▼ Computational intelligence techniques, such as artificial neural networks (ANNs), have been widely used to improve the performance of power system monitoring and control. Although inspired by the neurons in the brain, ANNs are largely different from living neuron networks (LNNs) in many aspects. Due to the oversimplification, the huge computational potential of LNNs cannot be realized by ANNs. Therefore, a more brain-like artificial neural network is highly desired to bridge the gap between ANNs and LNNs.
The focus of this research is to develop a biologically inspired artificial neural network (BIANN), which is not only biologically meaningful, but also computationally powerful. The BIANN can serve as a novel computational intelligence tool in monitoring, modeling and control of the power systems.
A comprehensive survey of ANNs applications in power system is presented. It is shown that novel types of reservoir-computing-based ANNs, such as echo state networks (ESNs) and liquid state machines (LSMs), have stronger modeling capability than conventional ANNs. The feasibility of using ESNs as modeling and control tools is further investigated in two specific power system applications, namely, power system nonlinear load modeling for true load harmonic prediction and the closed-loop control of active filters for power quality assessment and enhancement. It is shown that in both applications, ESNs are capable of providing satisfactory performances with low computational requirements.
A novel, more brain-like artificial neural network, i.e. biologically inspired artificial neural network (BIANN), is proposed in this dissertation to bridge the gap between ANNs and LNNs and provide a novel tool for monitoring and control in power systems. A comprehensive survey of the spiking models of living neurons as well as the coding approaches is presented to review the state-of-the-art in BIANN research. The proposed BIANNs are based on spiking models of living neurons with adoption of reservoir-computing approaches. It is shown that the proposed BIANNs have strong modeling capability and low computational requirements, which makes it a perfect candidate for online monitoring and control applications in power systems.
BIANN-based modeling and control techniques are also proposed for power system applications. The proposed modeling and control schemes are validated for the modeling and control of a generator in a single-machine infinite-bus system under various operating conditions and disturbances. It is shown that the proposed BIANN-based technique can provide better control of the power system to enhance its reliability and tolerance to disturbances.
To sum up, a novel, more brain-like artificial neural network, i.e. biologically inspired artificial neural network (BIANN), is proposed in this dissertation to bridge the gap between ANNs and LNNs and provide a novel tool for monitoring and control in power systems. It is clearly shown that the proposed BIANN-based modeling and control schemes can provide faster and more…
Advisors/Committee Members: Harley, Ronald (Committee Chair), habetler, tom (Committee Member), Michaels, Jennifer (Committee Member), potter, steve (Committee Member), Venayagamoorthy, Ganesh (Committee Member).
Subjects/Keywords: Artificial neural network; Biologically-inspired artificial neural networks; Spiking neuron model; Power system; Neural networks (Computer science); Computational intelligence
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APA (6th Edition):
Dai, J. (2013). Reservoir-computing-based, biologically inspired artificial neural networks and their applications in power systems. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/47646
Chicago Manual of Style (16th Edition):
Dai, Jing. “Reservoir-computing-based, biologically inspired artificial neural networks and their applications in power systems.” 2013. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/47646.
MLA Handbook (7th Edition):
Dai, Jing. “Reservoir-computing-based, biologically inspired artificial neural networks and their applications in power systems.” 2013. Web. 27 Feb 2021.
Vancouver:
Dai J. Reservoir-computing-based, biologically inspired artificial neural networks and their applications in power systems. [Internet] [Doctoral dissertation]. Georgia Tech; 2013. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/47646.
Council of Science Editors:
Dai J. Reservoir-computing-based, biologically inspired artificial neural networks and their applications in power systems. [Doctoral Dissertation]. Georgia Tech; 2013. Available from: http://hdl.handle.net/1853/47646
20.
Semidey, Stephen Andrew.
Thermal design and optimization of high torque density electric machines.
Degree: PhD, Mechanical Engineering, 2012, Georgia Tech
URL: http://hdl.handle.net/1853/48967
► The overarching goal of this work is to address the design of next-generation, high torque density electrical machines through numerical optimization using an integrated thermal-electromagnetic…
(more)
▼ The overarching goal of this work is to address the design of next-generation, high torque density electrical machines through numerical optimization using an integrated thermal-electromagnetic design tool that accounts for advanced cooling technology. A parametric thermal model of electric machines was constructed and implemented using a finite difference approach incorporating an automated, self segmenting mesh generation. A novel advanced cooling technology is proposed to improve thermal transport in the machine by removing heat directly from the windings via heat exchangers located between the winding bundles. Direct winding heat exchange (DWHX) requires high convective transport and low pressure loss. The heat transfer to pressure drop tradeoff was addressed by developing empirically derived Nusselt number and friction factor correlations for micro-hydrofoil enhanced meso-channels. The parametric thermal model, advanced cooling technique, Nusselt number and friction factor correlations were combined with a parametric electromagnetic model for electric machines. The integrated thermal-electromagnetic model was then used in conjunction with particle swarm optimization to determine optimal conceptual designs. The Nusselt number correlation achieves an R² value of 0.99 with 95% of the data falling within ± 2.5% similarly the friction factor correlation achieves an R² value of 0.92 with 95% of the data falling within ± 10.2%. The integrated thermal-electromagnetic design tool, incorporating DWHX, generated an optimized 20 kW permanent magnet electric machine design achieving a torque density of 23.2 N-m/L based on total system volume.
Advisors/Committee Members: Mayor, J. Rhett (advisor), Bras, Bert (committee member), Harley, Ronald (committee member), Jeter, Sheldon (committee member), Joshi, Yogendra (committee member).
Subjects/Keywords: Nusselt correlation; Finite difference; Micro-hydrofoil arrays; Thermal modeling; Friction factor correlation; Electric machines; Non-linear global optimization; Mass transfer; Cooling
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APA (6th Edition):
Semidey, S. A. (2012). Thermal design and optimization of high torque density electric machines. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/48967
Chicago Manual of Style (16th Edition):
Semidey, Stephen Andrew. “Thermal design and optimization of high torque density electric machines.” 2012. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/48967.
MLA Handbook (7th Edition):
Semidey, Stephen Andrew. “Thermal design and optimization of high torque density electric machines.” 2012. Web. 27 Feb 2021.
Vancouver:
Semidey SA. Thermal design and optimization of high torque density electric machines. [Internet] [Doctoral dissertation]. Georgia Tech; 2012. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/48967.
Council of Science Editors:
Semidey SA. Thermal design and optimization of high torque density electric machines. [Doctoral Dissertation]. Georgia Tech; 2012. Available from: http://hdl.handle.net/1853/48967
21.
Liang, Jiaqi.
Wind energy and power system interconnection, control, and operation for high penetration of wind power.
Degree: PhD, Electrical and Computer Engineering, 2012, Georgia Tech
URL: http://hdl.handle.net/1853/47570
► High penetration of wind energy requires innovations in different areas of power engineering. Methods for improving wind energy and power system interconnection, control, and operation…
(more)
▼ High penetration of wind energy requires innovations in different areas of power engineering. Methods for improving wind energy and power system interconnection, control, and operation are proposed in this dissertation. A feed-forward transient compensation control scheme is proposed to enhance the low-voltage ride-through capability of wind turbines equipped with doubly fed induction generators. Stator-voltage transient compensation terms are introduced to suppress rotor-current overshoots and torque ripples during grid faults. A dynamic stochastic optimal power flow control scheme is proposed to optimally reroute real-time active and reactive power flow in the presence of high variability and uncertainty. The performance of the proposed power flow control scheme is demonstrated in test power systems with large wind plants. A combined energy-and-reserve wind market scheme is proposed to reduce wind production uncertainty. Variable wind reserve products are created to absorb part of the wind production variation. These fast wind reserve products can then be used to regulate system frequency and improve system security.
Advisors/Committee Members: Harley, Ronald (Committee Chair), Grijalva, Santiago (Committee Member), Habetler, Thomas (Committee Member), Taylor, David (Committee Member), Venayagamoorthy, Ganesh (Committee Member).
Subjects/Keywords: Wind power market; Adaptive critic designs; Dynamic stochastic optimal power flow; Low voltage ride through; Doubly fed induction generator; Wind energy; Wind power; Wind energy conversion systems; Induction generators
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APA (6th Edition):
Liang, J. (2012). Wind energy and power system interconnection, control, and operation for high penetration of wind power. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/47570
Chicago Manual of Style (16th Edition):
Liang, Jiaqi. “Wind energy and power system interconnection, control, and operation for high penetration of wind power.” 2012. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/47570.
MLA Handbook (7th Edition):
Liang, Jiaqi. “Wind energy and power system interconnection, control, and operation for high penetration of wind power.” 2012. Web. 27 Feb 2021.
Vancouver:
Liang J. Wind energy and power system interconnection, control, and operation for high penetration of wind power. [Internet] [Doctoral dissertation]. Georgia Tech; 2012. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/47570.
Council of Science Editors:
Liang J. Wind energy and power system interconnection, control, and operation for high penetration of wind power. [Doctoral Dissertation]. Georgia Tech; 2012. Available from: http://hdl.handle.net/1853/47570
22.
Lee, Yong Hee.
A comprehensive protection scheme for distribution systems.
Degree: PhD, Electrical and Computer Engineering, 2014, Georgia Tech
URL: http://hdl.handle.net/1853/53070
► The objective of the research is to formulate and demonstrate protection schemes for radial and loop systems, an active distribution system, and a microgrid. The…
(more)
▼ The objective of the research is to formulate and demonstrate protection schemes for radial and loop systems, an active distribution system, and a microgrid. The schemes are composed of a) A new loop scheme by utilizing voltage, current, and time (VIT) reclosers and sectionalizers and b) A new protection scheme, the dynamic state estimation-based protection, for active distribution systems and microgrids.
The first part of the research explores the closing onto a fault during the conventional loop sectionalizing scheme and provides a VIT scheme that can solve the problem. The immediate benefit of the VIT schemes is a reduction of the nuisance trips because of the fault closing onto a fault. Moreover, the number of protection zones is increased by the application of the VIT sectionalizers. This thesis demonstrates the VIT protection scheme for a traditional distribution system and presents numerical experiments using various test scenarios with various fault locations. The simulation results verify that the protection scheme successfully performs the automatic load transfer scheme for a loop system.
The second part of the research identifies the increased number of protection issues according to the installation of distributed generations (DGs) and provides solution to the problem. To solve the issue, a new fault detection scheme, dynamic state estimation-based protection scheme, is illustrated in this thesis based on synchronized measurements. The method uses dynamic state estimation, based on the dynamic model of the component that accurately reflects the nonlinear characteristics of the component. Numerical experiments show that the protection of active distribution systems and microgrids is feasible in real time.
Advisors/Committee Members: Meliopoulos, A.P. Sakis (advisor), Habetler, Thomas (committee member), Saeedifard, Maryam (committee member), Sun, Andy (committee member), Harley, Ronald (committee member).
Subjects/Keywords: Recloser; Sectionalizer; Microgrid; Protection; Dynamic state estimation; Active distribution system
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APA (6th Edition):
Lee, Y. H. (2014). A comprehensive protection scheme for distribution systems. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/53070
Chicago Manual of Style (16th Edition):
Lee, Yong Hee. “A comprehensive protection scheme for distribution systems.” 2014. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/53070.
MLA Handbook (7th Edition):
Lee, Yong Hee. “A comprehensive protection scheme for distribution systems.” 2014. Web. 27 Feb 2021.
Vancouver:
Lee YH. A comprehensive protection scheme for distribution systems. [Internet] [Doctoral dissertation]. Georgia Tech; 2014. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/53070.
Council of Science Editors:
Lee YH. A comprehensive protection scheme for distribution systems. [Doctoral Dissertation]. Georgia Tech; 2014. Available from: http://hdl.handle.net/1853/53070
23.
Paquette, Andrew Donald.
Power quality and inverter-generator interactions in microgrids.
Degree: PhD, Electrical and Computer Engineering, 2014, Georgia Tech
URL: http://hdl.handle.net/1853/51803
► This research addresses some of the difficulties faced when operating voltage controlled inverters with synchronous generators in microgrids. First, an overview of microgrid value propositions…
(more)
▼ This research addresses some of the difficulties faced when operating voltage controlled inverters with synchronous generators in microgrids. First, an overview of microgrid value propositions is provided, and the problems faced when attempting to use microgrids to provide improved power quality are discussed. Design considerations for different types of microgrids are provided to enable microgrids to deliver the desired functionality without adding unnecessary cost. The main body of this research investigates the poor transient load sharing encountered between voltage controlled inverters and synchronous generators in islanded operation. Poor transient load sharing results in high peak inverter rating requirements and high cost. The tradeoff between power quality and power sharing is highlighted, and methods to improve transient load sharing are proposed. The use of current limiting to protect inverters during faults and overloads is also investigated. Stability problems are identified when using simple inverter current limiting methods when operating in parallel with synchronous generators. Virtual impedance current limiting is proposed to improve transient stability during current limiting. The methods proposed in this thesis for mitigating inverter overloads and faults will allow for more reliable and cost effective application of inverter based distributed energy resources with synchronous generators in microgrids.
Advisors/Committee Members: Divan, Deepak (advisor), Harley, Ronald (committee member), Grijalva, Santiago (committee member), Williams, Douglas (committee member), Mayor, Rhett (committee member).
Subjects/Keywords: Microgrids; Inverter; Synchronous generator; Virtual impedance; Distributed generation of electric power; Interconnected electric utility systems; Synchronous generators; Electric inverters
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APA (6th Edition):
Paquette, A. D. (2014). Power quality and inverter-generator interactions in microgrids. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/51803
Chicago Manual of Style (16th Edition):
Paquette, Andrew Donald. “Power quality and inverter-generator interactions in microgrids.” 2014. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/51803.
MLA Handbook (7th Edition):
Paquette, Andrew Donald. “Power quality and inverter-generator interactions in microgrids.” 2014. Web. 27 Feb 2021.
Vancouver:
Paquette AD. Power quality and inverter-generator interactions in microgrids. [Internet] [Doctoral dissertation]. Georgia Tech; 2014. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/51803.
Council of Science Editors:
Paquette AD. Power quality and inverter-generator interactions in microgrids. [Doctoral Dissertation]. Georgia Tech; 2014. Available from: http://hdl.handle.net/1853/51803
24.
Das, Debrup.
Dynamic control of grid power flow using controllable network transformers.
Degree: PhD, Electrical and Computer Engineering, 2011, Georgia Tech
URL: http://hdl.handle.net/1853/43739
► The objective of the research is to develop a cost-effective, dynamic grid controller called the controllable network transformer (CNT) that can be implemented by augmenting…
(more)
▼ The objective of the research is to develop a cost-effective, dynamic grid controller called the controllable network transformer (CNT) that can be implemented by augmenting existing load tap changing (LTC) transformers with an AC-AC converter. The concept is based on using a fractionally rated direct AC-AC converter to control the power through an existing passive LTC. By using a modulation strategy based on virtual quadrature sources (VQS), it is possible to control both the magnitude and the phase angle of the output voltage of the CNT without having any inter-phase connections. The CNT architecture has many advantages over existing power flow controllers, like absence of low frequency storage, fractional converter rating, retro-fitting existing assets and independent per-phase operation making it potentially attractive for utility applications.
The independent control of the magnitude and the phase angle of the output voltage allow independent real and reactive power flow control through the CNT-controlled line. In a meshed network with asymmetric network stresses this functionality can be used to redirect power from critically loaded assets to other relatively under-utilized parallel paths. The power flow controllability of CNT can thus be used to lower the overall cost of generation of power. The solid state switches in the CNT with fast response capability enable incorporation of various additional critical functionalities like grid fault ride through, bypassing internal faults and dynamic damping. This bouquet of features makes the CNT useful under both steady state and transient conditions without compromising the grid reliability.
Advisors/Committee Members: Divan, Deepak (Committee Chair), Habetler, Thomas (Committee Member), Harley, Ronald (Committee Member), Mayor, Rhett (Committee Member), Mukhopadhyay, Saibal (Committee Member).
Subjects/Keywords: Transmission power flow control; FACTS; Electricity; Electric power distribution; Electric power distribution Automation; Smart power grids
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APA ·
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APA (6th Edition):
Das, D. (2011). Dynamic control of grid power flow using controllable network transformers. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/43739
Chicago Manual of Style (16th Edition):
Das, Debrup. “Dynamic control of grid power flow using controllable network transformers.” 2011. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/43739.
MLA Handbook (7th Edition):
Das, Debrup. “Dynamic control of grid power flow using controllable network transformers.” 2011. Web. 27 Feb 2021.
Vancouver:
Das D. Dynamic control of grid power flow using controllable network transformers. [Internet] [Doctoral dissertation]. Georgia Tech; 2011. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/43739.
Council of Science Editors:
Das D. Dynamic control of grid power flow using controllable network transformers. [Doctoral Dissertation]. Georgia Tech; 2011. Available from: http://hdl.handle.net/1853/43739
25.
Huh, Suzanne Lynn.
Design of power delivery networks for noise suppression and isolation using power transmission lines.
Degree: PhD, Electrical and Computer Engineering, 2011, Georgia Tech
URL: http://hdl.handle.net/1853/42842
► In conventional design of power delivery networks (PDNs), the PDN impedance is required to be less than the target impedance over the frequency range of…
(more)
▼ In conventional design of power delivery networks (PDNs), the PDN impedance is required to be less than the target impedance over the frequency range of interest to minimize the IR drop and to suppress the inductive noise during data transitions. As a result, most PDNs in high-speed systems consist of power and ground planes to provide a low-impedance path between the voltage regulator module (VRM) and the integrated circuit (IC) on the printed circuit board (PCB).
For off-chip signaling, charging and discharging signal transmission lines induce return currents on the power and ground planes. The return current always follows the path of least impedance on the reference plane closest to the signal transmission line. The return current path plays a critical role in maintaining the signal integrity of the bits propagating on the signal transmission lines. The problem is that the disruption between the power and ground planes induces return path discontinuities (RPDs), which create displacement current sources between the power and ground planes. The current sources excite the plane cavity and cause voltage fluctuations. These fluctuations are proportional to the plane impedance since the current is drawn through the PDN by the driver. Therefore, low PDN impedance is required for power supply noise reduction.
Alternatively, methods of preventing RPDs can be used to suppress power supply noise. Using a power transmission line (PTL) eliminates the discontinuity between the power and ground planes, thereby preventing the RPD effects. In this approach, transmission lines replace the power plane for conveying power from the VRM to each IC on the PCB. The PTL-based PDN enables both power and signal transmission lines to be referenced to the same ground plane so that a continuous current path can be formed, unlike the power-plane-based PDN. As a result, a closed current loop is achieved, and the voltage fluctuation caused by RPDs is removed in idealistic situations. Without the RPD-related voltage fluctuation, reducing the PDN impedance is not as critical as in the power-plane-based approach. Instead, the impedance of the PTL is determined by the impedance of the signaling circuits.
To use the PTL-based PDN in a practical signaling environment, several issues need to be solved. First, the dc drop coming from the source termination of the PTL needs to be addressed. The driver being turned on and off dictates the current flow through the PTL, causing the dc drop to be dynamic, which depends on the data pattern. Second, impedance mismatch between the PTL and termination can occur due to manufacturing variations. Third, an increase in the number of PCB traces should be addressed by devising a method to feed more than one driver with one PTL. Lastly, the power required to transmit 1 bit of data should be optimized for the PTL by using a new signaling scheme and adjusting the impedance of the signaling circuit.
Constant flow of current through the PDN is one solution proposed to address the first two issues. Constant current…
Advisors/Committee Members: Swaminathan, Madhavan (Committee Chair), Harley, Ronald (Committee Member), Keezer, David (Committee Member), Peterson, Andrew (Committee Member), Sitaraman, Suresh (Committee Member).
Subjects/Keywords: Power delivery network; Switching noise; Electromagnetic band gap; Power transmission; Semiconductors; Microelectronics; Mixed signal circuits
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APA (6th Edition):
Huh, S. L. (2011). Design of power delivery networks for noise suppression and isolation using power transmission lines. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/42842
Chicago Manual of Style (16th Edition):
Huh, Suzanne Lynn. “Design of power delivery networks for noise suppression and isolation using power transmission lines.” 2011. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/42842.
MLA Handbook (7th Edition):
Huh, Suzanne Lynn. “Design of power delivery networks for noise suppression and isolation using power transmission lines.” 2011. Web. 27 Feb 2021.
Vancouver:
Huh SL. Design of power delivery networks for noise suppression and isolation using power transmission lines. [Internet] [Doctoral dissertation]. Georgia Tech; 2011. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/42842.
Council of Science Editors:
Huh SL. Design of power delivery networks for noise suppression and isolation using power transmission lines. [Doctoral Dissertation]. Georgia Tech; 2011. Available from: http://hdl.handle.net/1853/42842
26.
Gray, Blake Raymond.
Design of RF and microwave parametric amplifiers and power upconverters.
Degree: PhD, Electrical and Computer Engineering, 2012, Georgia Tech
URL: http://hdl.handle.net/1853/43613
► The objective of this research is to develop, characterize, and demonstrate novel parametric architectures capable of wideband operation while maintaining high gain and stability. To…
(more)
▼ The objective of this research is to develop, characterize, and demonstrate novel parametric architectures capable of wideband operation while maintaining high gain and stability. To begin the study, phase-incoherent upconverting parametric amplifiers will be explored by first developing a set of analytical models describing their achievable gain and efficiency. These models will provide a set of design tools to optimize and evaluate prototype circuit boards. The prototype boards will then be used to demonstrate their achievable gain, bandwidth, efficiency, and stability. Further investigation of the analytical models and data collected from the prototype boards will conclude bandwidth and gain limitations and end the investigation into phase-incoherent upconverting parametric amplifiers in lieu of negative-resistance parametric amplifiers.
Traditionally, there were two versions of negative-resistance parametric amplifiers available: degenerate and non-degenerate. Both modes of operation are considered single-frequency amplifiers because both the input and output frequencies occur at the source frequency. Degenerate parametric amplifiers offer more power gain than their non-degenerate counterpart and do not require additional circuitry for idler currents. As a result, a phase-coherent degenerate parametric amplifier printed circuit board prototype will be built to investigate achievable gain, bandwidth, and stability. Analytical models will be developed to describe the gain and efficiency of phase-coherent degenerate parametric amplifiers. The presence of a negative resistance suggests the possibility of instability under certain operating conditions, therefore, an in-depth stability study of phase-coherent degenerate parametric amplifiers will be performed.
The observation of upconversion gain in phase-coherent degenerate parametric amplifiers will spark investigation into a previously unknown parametric architecture: phase-coherent upconverting parametric amplifiers. Using the phase-coherent degenerate parametric amplifier prototype board, stable phase-coherent upconversion with gain will be demonstrated from the source input frequency to its third harmonic. An analytical model describing the large-signal transducer gain of phase-coherent upconverting parametric amplifiers from the first to the third harmonic of the source input will be derived and validated using the prototype board and simulations.
Advisors/Committee Members: Kenney, Steve (Committee Chair), Harley, Ronald (Committee Member), Kohl, Paul (Committee Member), Kornegay, Kevin (Committee Member), Papapolymerou, John (Committee Member).
Subjects/Keywords: Parametric; Amplifiers; Nonlinear circuits; Mixers; Nonlinear stability; Power amplifiers; Amplifiers (Electronics); Amplifiers, Radio frequency; Parametric amplifiers; Microwave amplifiers
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APA (6th Edition):
Gray, B. R. (2012). Design of RF and microwave parametric amplifiers and power upconverters. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/43613
Chicago Manual of Style (16th Edition):
Gray, Blake Raymond. “Design of RF and microwave parametric amplifiers and power upconverters.” 2012. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/43613.
MLA Handbook (7th Edition):
Gray, Blake Raymond. “Design of RF and microwave parametric amplifiers and power upconverters.” 2012. Web. 27 Feb 2021.
Vancouver:
Gray BR. Design of RF and microwave parametric amplifiers and power upconverters. [Internet] [Doctoral dissertation]. Georgia Tech; 2012. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/43613.
Council of Science Editors:
Gray BR. Design of RF and microwave parametric amplifiers and power upconverters. [Doctoral Dissertation]. Georgia Tech; 2012. Available from: http://hdl.handle.net/1853/43613
27.
Sastry, Jyoti.
Direct AC control of grid assets.
Degree: PhD, Electrical and Computer Engineering, 2011, Georgia Tech
URL: http://hdl.handle.net/1853/41109
► The objective of the proposed research is to investigate feasible approaches to dynamic control of the power grid. Growth in the demand for electric power,…
(more)
▼ The objective of the proposed research is to investigate feasible approaches to dynamic control of the power grid. Growth in the demand for electric power, and an increase in the penetration of renewable energy resources are causing congestion on an already aging power grid. Conventional grid control involves the use of static assets that operate on long time scales. These assets provide no dynamic control on the grid, and are typically used for scheduled support. Existing solutions (FACTS devices) to dynamic grid control have seen minimal market penetration because of high cost and low reliability. The proposed research provides a solution for dynamic control of the power grid that augments existing grid assets with a thin AC converter (TACC) to realize enhanced dynamic control. The TACC is a direct AC converter with filter elements and no bulk energy storage that dynamically reflects the asset value on the grid. The converter has a fail-normal mode of operation that returns the asset to its initial operating state, thereby not degrading system reliability. Some applications of TACCs include Inverter-Less STATCOMs and Controllable Network Transformers, which are realized by augmenting shunt VAR capacitors and load tap changers respectively. The principle of virtual quadrature sources is proposed to enable conditioning of AC voltages and currents. The concept is a novel method to realize control of phase angle and, or harmonics in single-phase AC converters, with no bulk energy storage. This concept is used to control the TACC and provides the asset with significantly enhanced control capabilities. Scaling of the TACC to utility voltage and power levels has been addressed by proposing a novel multilevel direct AC converter. The concept proposes the use of commercially available low cost semiconductor devices to realize high power converters. The specific application chosen to validate the concept of TACCs, through a medium voltage design, is the Inverter-less STATCOM.
Advisors/Committee Members: Divan, Deepak (Committee Chair), Habetler, Thomas (Committee Member), Harley, Ronald (Committee Member), Mayor, Rhett (Committee Member), Taylor, David (Committee Member).
Subjects/Keywords: AC-AC converter; Dynamic grid control; Virtual quadrature sources; Statcoms; Electric power distribution Alternating current; Automatic control; Electric current converters; Adaptive control systems
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APA (6th Edition):
Sastry, J. (2011). Direct AC control of grid assets. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/41109
Chicago Manual of Style (16th Edition):
Sastry, Jyoti. “Direct AC control of grid assets.” 2011. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/41109.
MLA Handbook (7th Edition):
Sastry, Jyoti. “Direct AC control of grid assets.” 2011. Web. 27 Feb 2021.
Vancouver:
Sastry J. Direct AC control of grid assets. [Internet] [Doctoral dissertation]. Georgia Tech; 2011. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/41109.
Council of Science Editors:
Sastry J. Direct AC control of grid assets. [Doctoral Dissertation]. Georgia Tech; 2011. Available from: http://hdl.handle.net/1853/41109
28.
He, Dawei.
An advanced non-intrusive load monitoring technique and its application in smart grid building energy management systems.
Degree: PhD, Electrical and Computer Engineering, 2016, Georgia Tech
URL: http://hdl.handle.net/1853/54951
► The objective of the proposed research is to develop an intelligent load modeling, identification, and prediction technology to provide granular load energy consumption and performance…
(more)
▼ The objective of the proposed research is to develop an intelligent load modeling, identification, and prediction technology to provide granular load energy consumption and performance details and drive building energy reduction, demand reduction, and proactive equipment maintenance. Electricity consumption in commercial and residential sectors accounts for about 70% of the total electricity generation in United States. Buildings are the most important consumers, and contribute to over 80% of the consumptions in these two sectors. To reduce electrical energy spending and carbon emission, several studies from Pacific Northwest National Lab (PNNL) and National Renewable Energy Lab (NREL) prove that if equipped with the proper technologies, a commercial or a residential building can potentially improve energy savings of buildings by up to about 10% to 30% of their usage. However, the market acceptance of these new technologies today is still not sufficient, and the reason is generally acknowledged to be the lack of solution to quantify the contributions of these new technologies to the energy savings, and the invisibility of the loads in buildings. A non-intrusive load monitoring (NILM) system is proposed in this dissertation, which can identify every individual load in buildings and record the energy consumption, time-of-day variations and other relevant statistics of the identified load, with no access to the individual component. The challenge of such a non-intrusive load monitoring is to find features that are unique for a particular load and then to match a measured feature of an unknown load against a database or library of known. Many problems exist in this procedure and the proposed research is going to focus on three directions to overcome the bottlenecks. They are respectively fundamental load studies for a model-driven feature extraction, adaptive identification algorithms for load space extendibility, and the practical simplifications for the real industrial applications. The simulation results show the great potentials of this new technology in building energy monitoring and management.
Advisors/Committee Members: Habetler, Thomas (advisor), Harley, Ronald (advisor), Taylor, David (committee member), Saeedifard, Maryam (committee member), Zhu, Lei (committee member).
Subjects/Keywords: Smart building; NILM; Data mining; Machine learning; Smart grid
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APA (6th Edition):
He, D. (2016). An advanced non-intrusive load monitoring technique and its application in smart grid building energy management systems. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/54951
Chicago Manual of Style (16th Edition):
He, Dawei. “An advanced non-intrusive load monitoring technique and its application in smart grid building energy management systems.” 2016. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/54951.
MLA Handbook (7th Edition):
He, Dawei. “An advanced non-intrusive load monitoring technique and its application in smart grid building energy management systems.” 2016. Web. 27 Feb 2021.
Vancouver:
He D. An advanced non-intrusive load monitoring technique and its application in smart grid building energy management systems. [Internet] [Doctoral dissertation]. Georgia Tech; 2016. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/54951.
Council of Science Editors:
He D. An advanced non-intrusive load monitoring technique and its application in smart grid building energy management systems. [Doctoral Dissertation]. Georgia Tech; 2016. Available from: http://hdl.handle.net/1853/54951
29.
Perkel, Joshua.
The influence of critical asset management facets on improving reliability in power systems.
Degree: PhD, Electrical and Computer Engineering, 2008, Georgia Tech
URL: http://hdl.handle.net/1853/31690
► The objective of the proposed research is to develop statistical algorithms for controlling failure trends through targeted maintenance of at-risk components. The at-risk components are…
(more)
▼ The objective of the proposed research is to develop statistical algorithms for controlling failure trends through targeted maintenance of at-risk components. The at-risk components are identified via chronological history and diagnostic data, if available. Utility systems include many thousands (possibly millions) of components with many of them having already exceeded their design lives. Unfortunately, neither the budget nor manufacturing resources exist to allow for the immediate replacement of all these components. On the other hand, the utility cannot tolerate a decrease in reliability or the associated increased costs. To combat this problem, an overall maintenance model has been developed that utilizes all the available historical information (failure rates and population sizes) and diagnostic tools (real-time conditions of each component) to generate a maintenance plan. This plan must be capable of delivering the needed reliability improvements while remaining economical. It consists of three facets each of which addresses one of the critical asset management issues:
* Failure Prediction Facet - Statistical algorithm for predicting future failure trends and estimating required numbers of corrective actions to alter these failure trends to desirable levels. Provides planning guidance and expected future performance of the system.
* Diagnostic Facet - Development of diagnostic data and techniques for assessing the accuracy and validity of that data. Provides the true effectiveness of the different diagnostic tools that are available.
* Economics Facet - Stochastic model of economic benefits that may be obtained from diagnostic directed maintenance programs. Provides the cost model that may be used for budgeting purposes.
These facets function together to generate a diagnostic directed maintenance plan whose goal is to provide the best available guidance for maximizing the gains in reliability for the budgetary limits utility engineers must operate within.
Advisors/Committee Members: Begovic, Miroslav (Committee Chair), Hampton, Nigel (Committee Member), Harley, Ronald (Committee Member), Michaels, Thomas (Committee Member), Vidakovic, Brani (Committee Member).
Subjects/Keywords: Underground cable systems; Asset management; Failure prediction; Diagnostic testing; Power systems reliability; Reliability (Engineering); Reliability (Engineering) Statistical methods; Accelerated life testing
Record Details
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Record Details
Similar Records
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Perkel, J. (2008). The influence of critical asset management facets on improving reliability in power systems. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/31690
Chicago Manual of Style (16th Edition):
Perkel, Joshua. “The influence of critical asset management facets on improving reliability in power systems.” 2008. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/31690.
MLA Handbook (7th Edition):
Perkel, Joshua. “The influence of critical asset management facets on improving reliability in power systems.” 2008. Web. 27 Feb 2021.
Vancouver:
Perkel J. The influence of critical asset management facets on improving reliability in power systems. [Internet] [Doctoral dissertation]. Georgia Tech; 2008. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/31690.
Council of Science Editors:
Perkel J. The influence of critical asset management facets on improving reliability in power systems. [Doctoral Dissertation]. Georgia Tech; 2008. Available from: http://hdl.handle.net/1853/31690
30.
Cho, Namhun.
Allocation of individual harmonic emission limits in accordance with the principles of IEC/TR 61000-3-6.
Degree: PhD, Electrical and Computer Engineering, 2013, Georgia Tech
URL: http://hdl.handle.net/1853/49075
► A model of the accurate harmonic allocation methods is developed to improve the current emission limits of IEEE Std.519. IEC 61000-3-6 and IEEE Std. 519…
(more)
▼ A model of the accurate harmonic allocation methods is developed to improve the current emission limits of IEEE Std.519. IEC 61000-3-6 and IEEE Std. 519 have by now been accepted as two well known standards for interconnecting the MV and HV-EHV customers to utility systems and widely adopted as standards to many power utilities. It is worth noting that the harmonic current emission limits of both standards have not been compared and justified with analytical proofs because there is still no explanation that discusses the origin of the emission limits in IEEE Std. 519, or the complex feature of IEC 61000-3-6. Two new novel methods of allocating the harmonic current emission limits for MV customers and HV-EHV customers have been proposed. Both methods have been developed in accordance with the principles of IEC 61000-3-6. Task II has compared and investgated the emission limits of both IEC 61000-3-6 and IEEE Std. 519. The difference, inconsistency and inaccuracy have been proven with the perspective of practical evaluations based on their own principles. The investigations focus on the specific numerical proofs of the resulting voltage distortions and the current emission limits in the MV and HV-EHV systems rather than on the philosophies. The proposed methods strongly support IEC 61000-3-6 and IEEE Std. 519, and add to their value; these methods could also help utilities allocate fairly and accurately harmonic emission limits to their MV and HV-EHV customers.
Advisors/Committee Members: Begovic, Miroslav (advisor), Habetler, Thomas (committee member), Harley, Ronald (committee member), Ghovanloo, Maysam (committee member), Pan, Ronghua (committee member).
Subjects/Keywords: Harmonic allocation; Harmonic emission limits; Distribution automation systems; Power quality; Harmonics (Electric waves); Electric waves; Electric standards
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Cho, N. (2013). Allocation of individual harmonic emission limits in accordance with the principles of IEC/TR 61000-3-6. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/49075
Chicago Manual of Style (16th Edition):
Cho, Namhun. “Allocation of individual harmonic emission limits in accordance with the principles of IEC/TR 61000-3-6.” 2013. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/49075.
MLA Handbook (7th Edition):
Cho, Namhun. “Allocation of individual harmonic emission limits in accordance with the principles of IEC/TR 61000-3-6.” 2013. Web. 27 Feb 2021.
Vancouver:
Cho N. Allocation of individual harmonic emission limits in accordance with the principles of IEC/TR 61000-3-6. [Internet] [Doctoral dissertation]. Georgia Tech; 2013. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/49075.
Council of Science Editors:
Cho N. Allocation of individual harmonic emission limits in accordance with the principles of IEC/TR 61000-3-6. [Doctoral Dissertation]. Georgia Tech; 2013. Available from: http://hdl.handle.net/1853/49075
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