No abstract

This paper presents an implementation of the threelevel 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. Index Terms-Permanent-magnet synchronous generator (PMSG), wind generation, three-level back-to-back neutralpoint-clamp voltage source converter, carrier-based pulse width modulation, d-axis stator current control