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An implementation of three-level BTB NPC voltage source converter based-PMSG wind energy conversion system

This paper presents an implementation of the three-level back-to-back neutral-point-clamp voltage source converter based PMSG wind energy conversion system (WECS). The generator-side converter performs the maximum power point then tracks, integrates and optimizes control with the d-axis stator current control (ZDSC), while the grid-side converter regulates the dc-link voltage and reactive power to the gird via voltage oriented control (VOC). An even simple modified unipolar CB-PWM strategy for the three-level BTB NPC VSC is implemented to simplify the modulation algorithm. The simulation results are demonstrated to provide the performance and stability of the three-level BTB NPC VSC based-PMSG WECS in both the stand-alone and grid-connected conditions.