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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 October 17, 2019.
http://hdl.handle.net/1853/53394.
MLA Handbook (7th Edition):
Bednar, Chad Michael. “Parametric thermal modeling of switched reluctance and induction machines.” 2014. Web. 17 Oct 2019.
Vancouver:
Bednar CM. Parametric thermal modeling of switched reluctance and induction machines. [Internet] [Masters thesis]. Georgia Tech; 2014. [cited 2019 Oct 17].
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.
Howard, Dustin F.
Modeling, simulation, and analysis of grid connected dish-stirling solar power plants.
Degree: MS, Electrical and Computer Engineering, 2010, Georgia Tech
URL: http://hdl.handle.net/1853/34832
► The percentage of renewable energy within the global electric power generation portfolio is expected to increase rapidly over the next few decades due to increasing…
(more)
▼ The percentage of renewable energy within the global electric power generation portfolio is expected to increase rapidly over the next few decades due to increasing concerns about climate change, fossil fuel costs, and energy security. Solar thermal energy, also known as concentrating solar power (CSP), is emerging as an important solution to new demands for clean, renewable electricity generation. Dish-Stirling (DS) technology, a form of CSP, is a relatively new player in the renewable energy market, although research in the technology has been ongoing now for nearly thirty years. The first large plant utilizing DS technology, rated at 1.5 MW, came online in January 2010 in Peoria, AZ, and plants rated for several hundred MW are in the planning stages. Increasing capacity of this technology within the utility grid requires extensive dynamic simulation studies to ensure that the power system maintains its safety and reliability in spite of the technological challenges that DS technology presents, particularly related to the intermittency of the energy source and its use of a non-conventional asynchronous generator. The research presented in this thesis attempts to fill in the gaps between the well established research on Stirling engines in the world of thermodynamics and the use of DS systems in electric power system applications, a topic which has received scant attention in publications since the emergence of this technology.
DS technology uses a paraboloidal shaped dish of mirrors to concentrate sunlight to a single point. The high temperatures achieved at the focal point of the mirrors is used as a heat source for the Stirling engine, which is a closed-cycle, external heat engine. Invented by the Scottish clergyman Robert Stirling in 1816, the Stirling engine is capable of high efficiency and releases no emissions, making it highly compatible with concentrated solar energy. The Stirling engine turns a squirrel-cage induction generator, where electricity is delivered through underground cables from thousands of independent, autonomous 10-25 kW rated DS units in a large solar farm.
A dynamic model of the DS system is presented in this thesis, including models of the Stirling engine working gas and mechanical dynamics. Custom FORTRAN code is written to model the Stirling engine dynamics within PSCAD/EMTDC. The Stirling engine and various other components of the DS system are incorporated into an electrical network, including first a single-machine, infinite bus network, and then a larger 12-bus network including conventional generators, loads, and transmission lines. An analysis of the DS control systems is presented, and simulation results are provided to demonstrate the system's steady state and dynamic behavior within these electric power networks. Potential grid interconnection requirements are discussed, including issues with power factor correction and low voltage ride-through, and simulation results are provided to illustrate the dish-Stirling system's capability for meeting such…
Advisors/Committee Members: Harley, Ronald (Committee Chair), Divan, Deepakraj (Committee Member), Habetler, Thomas (Committee Member).
Subjects/Keywords: Dish stirling; Concentrating solar power; Solar; Renewable energy; Power generation; Electric power; Solar thermal; Solar power plants; Stirling engines; Electric power systems
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APA (6th Edition):
Howard, D. F. (2010). Modeling, simulation, and analysis of grid connected dish-stirling solar power plants. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/34832
Chicago Manual of Style (16th Edition):
Howard, Dustin F. “Modeling, simulation, and analysis of grid connected dish-stirling solar power plants.” 2010. Masters Thesis, Georgia Tech. Accessed October 17, 2019.
http://hdl.handle.net/1853/34832.
MLA Handbook (7th Edition):
Howard, Dustin F. “Modeling, simulation, and analysis of grid connected dish-stirling solar power plants.” 2010. Web. 17 Oct 2019.
Vancouver:
Howard DF. Modeling, simulation, and analysis of grid connected dish-stirling solar power plants. [Internet] [Masters thesis]. Georgia Tech; 2010. [cited 2019 Oct 17].
Available from: http://hdl.handle.net/1853/34832.
Council of Science Editors:
Howard DF. Modeling, simulation, and analysis of grid connected dish-stirling solar power plants. [Masters Thesis]. Georgia Tech; 2010. Available from: http://hdl.handle.net/1853/34832
Georgia Tech
3.
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 October 17, 2019.
http://hdl.handle.net/1853/56279.
MLA Handbook (7th Edition):
Chen, Hao. “Soft-switching solid state transformer (S4T).” 2016. Web. 17 Oct 2019.
Vancouver:
Chen H. Soft-switching solid state transformer (S4T). [Internet] [Doctoral dissertation]. Georgia Tech; 2016. [cited 2019 Oct 17].
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
4.
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 October 17, 2019.
http://hdl.handle.net/1853/58179.
MLA Handbook (7th Edition):
Peppanen, Jouni Aleksi. “Improving distribution system model accuracy by leveraging ubiquitous sensors.” 2016. Web. 17 Oct 2019.
Vancouver:
Peppanen JA. Improving distribution system model accuracy by leveraging ubiquitous sensors. [Internet] [Doctoral dissertation]. Georgia Tech; 2016. [cited 2019 Oct 17].
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
5.
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 October 17, 2019.
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. 17 Oct 2019.
Vancouver:
Reno MJ. Streamlined interconnection analysis of distributed PV using advanced simulation methods. [Internet] [Doctoral dissertation]. Georgia Tech; 2015. [cited 2019 Oct 17].
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
6.
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 October 17, 2019.
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. 17 Oct 2019.
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 2019 Oct 17].
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
7.
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 ·
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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 October 17, 2019.
http://hdl.handle.net/1853/54917.
MLA Handbook (7th Edition):
Liu, Nan. “Design of a universal inductive charging system for electric vehicles.” 2015. Web. 17 Oct 2019.
Vancouver:
Liu N. Design of a universal inductive charging system for electric vehicles. [Internet] [Doctoral dissertation]. Georgia Tech; 2015. [cited 2019 Oct 17].
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
8.
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 (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 October 17, 2019.
http://hdl.handle.net/1853/52210.
MLA Handbook (7th Edition):
Kim, Suhwan. “Mixed-source charger-supply CMOS IC.” 2014. Web. 17 Oct 2019.
Vancouver:
Kim S. Mixed-source charger-supply CMOS IC. [Internet] [Doctoral dissertation]. Georgia Tech; 2014. [cited 2019 Oct 17].
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
9.
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 October 17, 2019.
http://hdl.handle.net/1853/53150.
MLA Handbook (7th Edition):
Onyewuchi, Urenna. “Managing environmentally stressed aging assets in electric power utilities.” 2012. Web. 17 Oct 2019.
Vancouver:
Onyewuchi U. Managing environmentally stressed aging assets in electric power utilities. [Internet] [Doctoral dissertation]. Georgia Tech; 2012. [cited 2019 Oct 17].
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
10.
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 October 17, 2019.
http://hdl.handle.net/1853/53900.
MLA Handbook (7th Edition):
Alquthami, Thamer. “A smart house energy management system.” 2015. Web. 17 Oct 2019.
Vancouver:
Alquthami T. A smart house energy management system. [Internet] [Doctoral dissertation]. Georgia Tech; 2015. [cited 2019 Oct 17].
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
11.
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 October 17, 2019.
http://hdl.handle.net/1853/53908.
MLA Handbook (7th Edition):
Dang, Jie. “Switched reluctance machine electromagnetic design and optimization.” 2015. Web. 17 Oct 2019.
Vancouver:
Dang J. Switched reluctance machine electromagnetic design and optimization. [Internet] [Doctoral dissertation]. Georgia Tech; 2015. [cited 2019 Oct 17].
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
12.
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 October 17, 2019.
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. 17 Oct 2019.
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 2019 Oct 17].
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
13.
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 ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
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 October 17, 2019.
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. 17 Oct 2019.
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 2019 Oct 17].
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
14.
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 ·
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to Zotero / EndNote / Reference
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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 October 17, 2019.
http://hdl.handle.net/1853/56306.
MLA Handbook (7th Edition):
Tan, Zhenyu. “Dynamic state estimation based transmission line protection.” 2016. Web. 17 Oct 2019.
Vancouver:
Tan Z. Dynamic state estimation based transmission line protection. [Internet] [Doctoral dissertation]. Georgia Tech; 2016. [cited 2019 Oct 17].
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
15.
Duan, Yao.
Method for design and optimization of surface mount permanent magnet machines and induction machines.
Degree: PhD, Electrical and Computer Engineering, 2010, Georgia Tech
URL: http://hdl.handle.net/1853/37280
► Advances in electrical machinery with high efficiencies could significantly reduce the cost of industrial and residential energy systems, thereby reducing fossil fuel needs and emissions.…
(more)
▼ Advances in electrical machinery with high efficiencies could significantly reduce the cost of industrial and residential energy systems, thereby reducing fossil fuel needs and emissions. Electrical machine design is a comprehensive process based on several factors, including economic factors, material limitations, specifications and special application-dependent factors. At the same time, machine design is a multi-physics task comprising of electric design, magnetic design, insulation design, thermal design and mechanical design. However, the out-of-date conventional machine design can neither reflect the advances in the past 30 years, nor exploit the trade-offs between design factors from the multi-physics nature of the electrical machine.
This work focus on the development a fast and efficient method for the design and optimization of Surface Mount Permanent Magnet (SMPM) machines and induction machines, as influenced by the energy source, mechanical loads, thermal effects, and the up-to-date developments in materials and manufacturing capabilities.
A new analytical design method is developed for the electromagnetic design of SMPM machines. Both distributed and concentrated winding types of SMPM machines are considered and compared. Based on the proposed electromagnetic analytical design method and a generic thermo-mechanical machine design model [1], an innovative and computationally efficient electromagnetic-thermo-mechanical integrated design method is developed for SMPM machines. Particle Swarm Optimization (PSO) is applied in a novel way based on this integrated design method for the multi-objective design optimization of SMPM machines. With the proposed method, the thermal and mechanical design is no longer treated separately and heuristically as in the traditional design, but has been systemically integrated with the electromagnetic design; the effect of power source, cooling capability, thermal limits, and up-to-date material capabilities are also reflected in the design and optimization. Superior designs compared to traditional designs can be achieved with PSO based multi-objective optimization. The proposed integrated design approach also has the merit of good computational efficiency and provides a significant time reduction of the design cycle compared to finite element analysis.
A novel electromagnetic analytical design method of induction machines has been developed, which needs only six prime design variables but is able to design induction machines in fine details. The advantage over the traditional and other existing design method is that this proposed method does not have the heuristic selection of the design variables and does not need manual design iterations. The computing time is almost negligible and the design cycle is significantly reduced compared to the tradition machine design.
Advisors/Committee Members: Harley, Ronald (Committee Chair), Divan, Deepak (Committee Member), Habetler, Thomas (Committee Member), Mayor, James (Committee Member), Taylor, David (Committee Member).
Subjects/Keywords: Design optimization; Electrical machines; Permanent magnet motors; Finite element method; Electric machinery, Induction
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APA ·
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MLA ·
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Export
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Manager
APA (6th Edition):
Duan, Y. (2010). Method for design and optimization of surface mount permanent magnet machines and induction machines. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/37280
Chicago Manual of Style (16th Edition):
Duan, Yao. “Method for design and optimization of surface mount permanent magnet machines and induction machines.” 2010. Doctoral Dissertation, Georgia Tech. Accessed October 17, 2019.
http://hdl.handle.net/1853/37280.
MLA Handbook (7th Edition):
Duan, Yao. “Method for design and optimization of surface mount permanent magnet machines and induction machines.” 2010. Web. 17 Oct 2019.
Vancouver:
Duan Y. Method for design and optimization of surface mount permanent magnet machines and induction machines. [Internet] [Doctoral dissertation]. Georgia Tech; 2010. [cited 2019 Oct 17].
Available from: http://hdl.handle.net/1853/37280.
Council of Science Editors:
Duan Y. Method for design and optimization of surface mount permanent magnet machines and induction machines. [Doctoral Dissertation]. Georgia Tech; 2010. Available from: http://hdl.handle.net/1853/37280
Georgia Tech
16.
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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Export
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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 October 17, 2019.
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. 17 Oct 2019.
Vancouver:
Wang Z. Implementation and assessment of demand response and voltage/var control with distributed generators. [Internet] [Doctoral dissertation]. Georgia Tech; 2015. [cited 2019 Oct 17].
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
17.
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 ·
Chicago ·
MLA ·
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Export
to Zotero / EndNote / Reference
Manager
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 October 17, 2019.
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. 17 Oct 2019.
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 2019 Oct 17].
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
18.
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 ·
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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 October 17, 2019.
http://hdl.handle.net/1853/53485.
MLA Handbook (7th Edition):
Sakib, Nazmus. “Effects of incorporating renewable energy sources into the electricity grid.” 2014. Web. 17 Oct 2019.
Vancouver:
Sakib N. Effects of incorporating renewable energy sources into the electricity grid. [Internet] [Masters thesis]. Georgia Tech; 2014. [cited 2019 Oct 17].
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
19.
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 October 17, 2019.
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. 17 Oct 2019.
Vancouver:
Taylor AM. Policy recommendations to realize the objectives of the future electric grid. [Internet] [Masters thesis]. Georgia Tech; 2013. [cited 2019 Oct 17].
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
20.
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 October 17, 2019.
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. 17 Oct 2019.
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 2019 Oct 17].
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
21.
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 October 17, 2019.
http://hdl.handle.net/1853/53070.
MLA Handbook (7th Edition):
Lee, Yong Hee. “A comprehensive protection scheme for distribution systems.” 2014. Web. 17 Oct 2019.
Vancouver:
Lee YH. A comprehensive protection scheme for distribution systems. [Internet] [Doctoral dissertation]. Georgia Tech; 2014. [cited 2019 Oct 17].
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
22.
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 October 17, 2019.
http://hdl.handle.net/1853/51803.
MLA Handbook (7th Edition):
Paquette, Andrew Donald. “Power quality and inverter-generator interactions in microgrids.” 2014. Web. 17 Oct 2019.
Vancouver:
Paquette AD. Power quality and inverter-generator interactions in microgrids. [Internet] [Doctoral dissertation]. Georgia Tech; 2014. [cited 2019 Oct 17].
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
23.
Jiang, Chen.
Condition monitoring of high efficiency heating, ventilation and air conditioning systems.
Degree: PhD, Electrical and Computer Engineering, 2017, Georgia Tech
URL: http://hdl.handle.net/1853/58759
► The objective of the proposed research is to increase energy efficiency in HVAC (Heating, Ventilation and Air conditioning) systems. Energy consumption has increased rapidly in…
(more)
▼ The objective of the proposed research is to increase energy efficiency in HVAC (Heating, Ventilation and Air conditioning) systems. Energy consumption has increased rapidly in recent decades. This has elevated concerns of a future energy crisis, and heavy negative environmental impacts. An air handler, or air handling unit, is a device used to condition and circulate air as part of a HVAC system. The operation of air handlers account, on average, for 40% of an industrial site’s total energy consumption. The air handler in the HVAC system has electrical and mechanical components that can experience problems from time to time. Airflow blockage and a failure of a blower motor are two of the most common problems in air handlers.
Airflow blockage is detected utilizing a current-based condition monitoring method, which analyzes the static pressure of the fan blade, load torque, and the fan motor speeds. For most air handlers, the unbalanced load of the blower wheel is created by unevenly distributed contaminants on the blades. The traditional current-based condition monitoring method is conducted on a brushless DC, or BLDC, fan motor, followed by a stray flux spectrum analysis, which increases reliability in detecting an unbalanced load condition. Static eccentricity and dynamic eccentricity are two of the main faults commonly found in the rotor of a BLDC motor. An improved method for detecting static eccentricity is proposed based on a comparison between the positive sequence current and negative sequence current. Finally, a current-based nonintrusive condition monitoring method is established for refrigerant level detection. A thermal model of a compressor is analyzed under insufficient refrigerant level conditions to explore the mathematical relationship between refrigerant level and stator winding resistance. An undercharged detection algorithm is proposed with a detailed analysis of temperature threshold settings. This algorithm can be easily implemented on the original HVAC system to increase the system’s reliability and efficiency, and to reduce the labor cost of refrigerant level detection.
Advisors/Committee Members: Habetler, Thomas (advisor), Harley, Ronald (committee member), Saeedifard, Maryam (committee member), Jeter, Sheldon (committee member), Fedigan, Stephen (committee member).
Subjects/Keywords: HVAC system; Condition monitoring
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APA (6th Edition):
Jiang, C. (2017). Condition monitoring of high efficiency heating, ventilation and air conditioning systems. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/58759
Chicago Manual of Style (16th Edition):
Jiang, Chen. “Condition monitoring of high efficiency heating, ventilation and air conditioning systems.” 2017. Doctoral Dissertation, Georgia Tech. Accessed October 17, 2019.
http://hdl.handle.net/1853/58759.
MLA Handbook (7th Edition):
Jiang, Chen. “Condition monitoring of high efficiency heating, ventilation and air conditioning systems.” 2017. Web. 17 Oct 2019.
Vancouver:
Jiang C. Condition monitoring of high efficiency heating, ventilation and air conditioning systems. [Internet] [Doctoral dissertation]. Georgia Tech; 2017. [cited 2019 Oct 17].
Available from: http://hdl.handle.net/1853/58759.
Council of Science Editors:
Jiang C. Condition monitoring of high efficiency heating, ventilation and air conditioning systems. [Doctoral Dissertation]. Georgia Tech; 2017. Available from: http://hdl.handle.net/1853/58759
24.
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 October 17, 2019.
http://hdl.handle.net/1853/41109.
MLA Handbook (7th Edition):
Sastry, Jyoti. “Direct AC control of grid assets.” 2011. Web. 17 Oct 2019.
Vancouver:
Sastry J. Direct AC control of grid assets. [Internet] [Doctoral dissertation]. Georgia Tech; 2011. [cited 2019 Oct 17].
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
25.
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 October 17, 2019.
http://hdl.handle.net/1853/43739.
MLA Handbook (7th Edition):
Das, Debrup. “Dynamic control of grid power flow using controllable network transformers.” 2011. Web. 17 Oct 2019.
Vancouver:
Das D. Dynamic control of grid power flow using controllable network transformers. [Internet] [Doctoral dissertation]. Georgia Tech; 2011. [cited 2019 Oct 17].
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
26.
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 October 17, 2019.
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. 17 Oct 2019.
Vancouver:
Huh SL. Design of power delivery networks for noise suppression and isolation using power transmission lines. [Internet] [Doctoral dissertation]. Georgia Tech; 2011. [cited 2019 Oct 17].
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
27.
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 October 17, 2019.
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. 17 Oct 2019.
Vancouver:
Gray BR. Design of RF and microwave parametric amplifiers and power upconverters. [Internet] [Doctoral dissertation]. Georgia Tech; 2012. [cited 2019 Oct 17].
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
28.
Zhang, Pinjia.
Active thermal protection for induction motors fed by motor control devices.
Degree: PhD, Electrical and Computer Engineering, 2010, Georgia Tech
URL: http://hdl.handle.net/1853/34811
► Induction motors are widely used in industrial processes. The malfunction of a motor may not only lead to high repair costs, but also cause immense…
(more)
▼ Induction motors are widely used in industrial processes. The malfunction of a motor may not only lead to high repair costs, but also cause immense financial losses due to unexpected process downtime. Since thermal overload is one of the major root causes of stator winding insulation failure, an accurate and reliable monitoring of the stator winding temperature is crucial to increase the mean time to catastrophic motor breakdown, and to reduce the extraordinary financial losses due to unexpected process downtime.
To provide a reliable thermal protection for induction motors fed by motor control devices, a dc signal-injection method is proposed for in-service induction motors fed by soft-starter and variable-frequency drives. The stator winding temperature can be monitored based on the estimated stator winding resistance using the dc model of induction motors. In addition, a cooling capability monitoring technique is proposed to monitor the cooling capability of induction motors and to warn the user for proactive inspection and maintenance in the case of cooling capability deterioration. The proposed cooling capability monitoring technique, combined with the proposed stator winding temperature monitoring technique, can provide a complete thermal protection for in-service induction motors fed by motor control devices.
Aside from online thermal protection during a motor's normal operation, the thermal protection of de-energized motors is also essential to prolong a motor's lifetime. Moisture condensation is one of the major causes to motor degradation especially in high-humidity environments. To prevent moisture condensation, a non-intrusive motor heating technique is proposed by injecting currents into the motor stator winding using soft-starters. A motor's temperature can be kept above the ambient temperature due to the heat dissipation, so that the moisture condensation can be avoided.
To sum up, active stator winding temperature estimation techniques for induction motors under both operating and de-energization conditions are proposed in this dissertation for both thermal protection and optimizing the operation of a motor system. The importance of these proposed techniques lies in their non-intrusive nature: only the existing hardware in a motor control device is required for implementation; a motor's normal operation is not interrupted.
Advisors/Committee Members: Habetler, Thomas (Committee Chair), Divan, Deepak (Committee Member), Harley, Ronald (Committee Member), Mayor, Rhett (Committee Member), Taylor, David (Committee Member).
Subjects/Keywords: Thermal protection; Condition monitoring; Soft starter; Stator temperature; Stator resistance; Motor drive; Induction motor; Electric motors, Induction; Heat Transmission
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APA (6th Edition):
Zhang, P. (2010). Active thermal protection for induction motors fed by motor control devices. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/34811
Chicago Manual of Style (16th Edition):
Zhang, Pinjia. “Active thermal protection for induction motors fed by motor control devices.” 2010. Doctoral Dissertation, Georgia Tech. Accessed October 17, 2019.
http://hdl.handle.net/1853/34811.
MLA Handbook (7th Edition):
Zhang, Pinjia. “Active thermal protection for induction motors fed by motor control devices.” 2010. Web. 17 Oct 2019.
Vancouver:
Zhang P. Active thermal protection for induction motors fed by motor control devices. [Internet] [Doctoral dissertation]. Georgia Tech; 2010. [cited 2019 Oct 17].
Available from: http://hdl.handle.net/1853/34811.
Council of Science Editors:
Zhang P. Active thermal protection for induction motors fed by motor control devices. [Doctoral Dissertation]. Georgia Tech; 2010. Available from: http://hdl.handle.net/1853/34811
29.
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 ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
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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 October 17, 2019.
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. 17 Oct 2019.
Vancouver:
Semidey SA. Thermal design and optimization of high torque density electric machines. [Internet] [Doctoral dissertation]. Georgia Tech; 2012. [cited 2019 Oct 17].
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
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
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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 October 17, 2019.
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. 17 Oct 2019.
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 2019 Oct 17].
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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