Grainger CEME

Center for Electric Machinery and Electromechanics

Decentralized Control of Distributed Generation using Markov Chains

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Brett Robbins with adviser A. Domínguez-García Distributed generation will play a pivotal role in the electrical grid with the introduction of new power generation technologies and government requirements to increase the penetration of renewable energy. Control of these systems is currently limited to maintaining a particular power factor. By developing the necessary control strategies, these […]

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Markov Models to Analyze Photovoltaic System Reliability and Performance

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Sairaj Dhople with adviser A. Domínguez-García Markov reliability models to estimate photovoltaic (PV) system reliability are derived and integrated with reward models to quantify system performance. The proposed framework is illustrated in Figure 19. The states in the Markov chain (i and j) correspond to operational or failed components. Each state is characterized by a […]

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Assessing the Impact of Wind Variability on Power System Small-Signal Reachability

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Christine Chen with adviser A. Domínguez-García The efforts to reduce our dependence on fossil fuels as a major source of electrical energy requires integrating renewable resources into the power grid. As these are generally highly variable, new tools are necessary to assess their impact on power system operational security. We propose using ellipsoidal methods. Our […]

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Wind Farm Model for Power System Stability

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Ph. D. student Hector A. Pulgar-Painemal with adviser P. Sauer Wind farms based on Type-C wind turbine generators (WTGs) were modeled. Based on time scale decomposition, two detailed dynamic models were considered. Both models included a rotor speed controller, a reactive power controller and a pitch angle controller. The turbine aerodynamic was represented by a […]

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High-power Operation of AlGaN/GaN HEMTs Achieved by PAMBE-SAG and SiO2 Gate Insulator

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PhD student Liang Pang with Adviser Kyekyoon (Kevin) Kim, Thin Film and Charged Particle Research Laboratory There are three key challenges in developing GaN-based devices for power-switching applications: achievement of low on-state resistance, high current density, and high breakdown voltage. We previously reported that selective-area growth (SAG) by plasma-assisted molecular beam epitaxy (PAMBE) is able […]

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The Use of Plug-in Electric Vehicles for Regulation Service

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McDavis Fasugba with adviser P. T. Krein Plug-in electric vehicles (PEV)s offer both a reduction in the transportation carbon footprint and a regulation benefit to the power system utility grid. During a high-demand time interval when there is a need for load reduction, a grid operator can very quickly(faster than getting expensive generation units online) […]

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Controlling an Active Parallel Interface Between a Transient Energy Source and a DC Voltage Bus

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Benjamin Niemoeller and adviser P. T. Krein This work investigates controlling a dc-dc converter connecting a capacitor or ultracapacitor (UC) to a dc voltage bus by regulating the converter series impedance. Decoupling the capacitance from the voltage bus is shown to reduce the size and/or weight of the power source. The dc-dc converter impedance is […]

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2MW PM Machine Design for Direct–Driven Wind Turbine Generator Application with High Torque and Low Speed

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Longya Xu, Power Electronics and Electric Machine Group, The Ohio State University The PM machine for a direct-driven wind turbine generator features a high power rating of 2MW with a low speed range of 10-20 rpm, constrained by wind turbine blades 100 meters in diameter. The rated generator torque is high, approaching 1 mega Nm […]

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Finite Element Analysis of 3D Electric Machine Problems

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Wang Yao with advisers J. M. Jin and P. T. Krein Efficiently delivering and utilizing energy are among the most challenging topics for power engineers. As one of the largest fossil energy consumers, electric machines have to be designed to operate at a high power density, optimal efficiency, and high degree of reliability. All these […]

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Control of Traditional Generation and Energy Storage Systems for Improved Coordination with Wind Farm Applications

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Professors Ted Brekken and Annette von Jouanne, Oregon State University (OSU), Electrical Engineering and Computer Science, Wallace Energy Systems and Renewables Facility (WESRF) This Grainger graduate student funding contributed to advancing research on wind energy integration through more effective coordination of traditional generation resources and energy storage systems (including analysis and control) to optimize wind […]

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