Abstract
In this study, two control strategies for speed and power control of three-level neutralpoint (3L-NPC) clamped back-to-back converters in wind energy conversion system (WECS) with permanent magnet synchronous generator (PMSG) are proposed. The system consists of generator side converters (GSCs) and grid side converter (GSC) which share a common DC-link capacitor. The proposed control laws combine sliding mode control (SMC) and vector oriented control (VOC) to maximise the generated power from wind turbine generators (WTGs). Considering the variation of wind speed, the GSC injects the generated power into the AC network, and regulates DC-link voltage. Also, it is employed to achieve unity power factor (UPC). The GSCs are employed to achieve maximum power point tracking (MPPT). To validate the proposed approaches, simulations are carried out with MATLAB/Simulink software. The simulation results demonstrate a good performance in various scenarios.
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