Abstract
This paper presents the Direct Power Control (DPC) strategy for a Doubly-Fed Induction Generator (DFIG) using Matrix Converter (MC). Wind turbines are subjected to irregular wind speeds and thus the power generated is varying in nature. The Active and Reactive power flow to the grid from the DFIG connected to the wind turbines can be controlled by connecting a Power Electronic converter at its rotor terminals. By this method, the Induction Machine can be operated in generating mode even at sub-synchronous speed, by controlling the slip power, fed-to or absorbed-from the grid. The DPC Scheme is a high performance, dynamic power control method for DFIG. In DPC, at every instant of switching, the vectors for the power converter are selected based on the instantaneous active and reactive power error command from a hysteresis band, rather than a predetermined pattern as in conventional PWM drives. This work presents the Matrix converter based DPC for DFIG where the conventional AC to DC to AC converter at the rotor terminal has been replaced by a three phase MC.
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