4 publications
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Analysis and Implementation of Carrier Based and Space Vector PWM Techniques on a Three-Phase Voltage Source InverterBy michael opare atakora, Arbin Ebrahim, Ji Hyun Lee
Abstract: This paper presents a comprehensive analysis of carrier based and space vector pulse width modulation (PWM) techniques on a two-level three-phase voltage source inverter (VSI). The results of simulations performed in Matlab/Simulink are compared to the results obtained from the implementation of the PWM schemes on an actual VSI whose PWM signals are generated using dSpace. The analysis of the inverter line to line voltages includes, a fast fourier transform …
Published in Journal of Power Electronics and Power Systems · Vol. 5, Issue 3, 2015 · pp. 125–139 Read article →
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Modeling and Control of A Grid Connected Wind Turbine Power System Under Variable Wind Speeds Using Doubly-Fed Induction MachineBy Goutham Gonti, Arbin Ebrahim, Gregory Murphy
Abstract: This paper focuses on the development of wind turbine system and extracting maximum power for variable speed constant frequency grid connected wind turbine power system with doubly fed induction generator. A voltage oriented control scheme is used for the control of both rotor side and grid side circuit. Pitch control mechanism is implemented for the power limitation at a wind speed greater than the rated speed. The DFIM stator side …
Published in Journal of Power Electronics and Power Systems · Vol. 5, Issue 3, 2015 · pp. 108–124 Read article →
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Maximum Power Point Tracking of a Variable Speed Permanent Magnet Synchronous Generator Based Wind Energy Conversion SystemBy michael opare atakora, Arbin Ebrahim, Gregory Murphy
Abstract: Wind turbines produce maximum power at the optimal tip-speed ratio. Fixed speed wind turbines are inefficient because the turbine blades rotate at a specific mechanical speed irrespective of the prevailing wind speed. The system is therefore, not able to extract the maximum possible amount of power. In this work, a maximum power point tracking scheme for a variable-speed permanent magnet synchronous generator based wind energy conversion system is implemented in …
Published in Journal of Power Electronics and Power Systems · Vol. 5, Issue 3, 2015 · pp. 35–51 Read article →
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Control of a Grid-Connected Variable Speed Permanent Magnet Synchronous Generator Based Wind Power Generation SystemBy michael opare atakora, Arbin Ebrahim, Gregory Murphy
Abstract: Variable speed wind turbines are more efficient compared to their fixed speed counterparts since maximum power is extracted over a wide range of wind speeds. In this work a grid-connected wind power generation system is modeled and implemented in Matlab/Simulink using a permanent magnet synchronous generator. A back to back space vector pulse width modulated voltage source converter converts the variable frequency generator currents and voltages into DC, then back …
Published in Journal of Power Electronics and Power Systems · Vol. 6, Issue 2, 2016 · pp. 8–24 Read article →