PMSG‐based VS‐WECS for constant active power delivery to standalone load using direct matrix converter‐based SST with BESS

Abstract

This study presents a simplified control algorithm for constant active power delivery to a weak-grid/standalone load from a variable speed-wind energy conversion system (VS-WECS). The proposed system consists of a permanent magnet synchronous generator (PMSG)-based WECS connected to a weak-grid/standalone through a direct matrix converter-based solid-state transformer (SST) along with a bidirectional buck–boost battery energy storage system (BESS). The power from the WECS is processed through the SST using Venturini-based control algorithm together with the voltage-oriented control scheme. This scheme effectively regulates active and reactive power as well as voltage gain of the SST. Wind turbines maximum power point tracking power curves are used to set reference for active power. While the reference for reactive power is taken as zero. The bidirectional buck–boost-based BESS is used to smoothen the power generated by the PMSG-based VS-WECS. It absorbs the surplus power from the WECS during over generating period and delivers power back under power shortage period. To validate the performances of the proposed scheme, extensive simulation has been performed and exclusive hardware built by dSPACE1104 using MATLAB/Simulink.