Maximum Power Point Tracking for Variable Speed Wind Turbines with DTC and DPC of MLCs Based on FLC
Ahmed M. Atallah Ahmed Abd Elsattar
Multilevel converters are essential for high capacity turbines and medium voltage generation. This paper presents an optimum maximum power Pmax(Wopt) technique to guaranty an optimal reference speed. PI controller and fuzzy logic controller for both direct torque control in machine side converter and direct power control of grid side converter with diode clamped five-level converter are implemented. The use of PI controller for both direct torque control and direct power control with multilevel converters is expected to decrease steady state error. It may increase peak overshoot and steady state time. And it cannot handle uncertainty (system parameters, sensor measurement). Replacing PI controller with fuzzy logic controller will decrease peak overshoot, steady state time and it can handle uncertainty. Direct torque control with fuzzy speed controller for multilevel converters improves the performance of wind turbine (MPPT) and Squirrel cage induction generator (speed, flux, torque and current) despite wind variation. Direct power control with fuzzy dc voltage controller for multilevel converters will improve power quality (the current injected to utility-grid). A comparison between PI controller and fuzzy logic controller for both machine side converter and grid side converter with diode clamped five-level converter has been done.
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