Abstract
This paper presents a modest control strategy of a doubly fed induction generator (DFIG)-based wind electric conversion system (WECS) with matrix converter, under unbalanced and harmonic grid conditions. Tedious sequence decomposition process and complex control reference calculations are avoided in the proposed control methodology. To obtain power grid-friendly operation, Band Pass-finite impulse response (BP-FIR) filters are designed to achieve four different control targets: sinusoidal stator current, sinusoidal rotor current, smooth stator real and reactive power and constant electromagnetic torque. In addition to active power reference from Maximum Power Point Tracking (MPPT) controller and desired reactive power reference, BP-FIR filters are used to synthesize space vectors of direct matrix converter. The effectiveness of the proposed approach is tested for a wide range of wind speeds.
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