A permanent magnet synchronous generator's rotor position and speed information is crucial in order to maximize the power extraction from this generator. Encoders have been commonly used to measure these quantities; however, they increase the cost, size, and complexity of the system as well as reducing the system's life-time and reliability. This thesis proposes a novel higher-order sliding-mode observer that will estimate the real-time rotor position and speed information for a permanent magnet synchronous generator-based wind energy conversion system. Unlike a first-order sliding-mode observer, the proposed observer has exceptional estimation accuracy and lower levels of chattering. The power converter for this system is a three-level neutral-point-clamped high power converter; which is controlled by space vector pulse width modulation. For this converter, the power semiconductor devices of the converter are required to block less voltage, and the output waveforms of the converter have a smaller total harmonic distortion when related to a standard two-level converter. Simulation results using MATLAB and Simulink show the superior performance of the purposed higher-order sliding-mode observer when compared to encoders for wind energy conversion systems.
|Commitee:||Lozowski, Andy, Shang, Ying|
|School:||Southern Illinois University at Edwardsville|
|Department:||Electrical and Computer Engineering|
|School Location:||United States -- Illinois|
|Source:||MAI 57/05M(E), Masters Abstracts International|
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