Controller Design for a Wind Turbine-Based Variable Speed Permanent Magnet Synchronous Generator Using Quasi-Z-Source Inverter in Stand-Alone Operation

This paper proposes a new permanent magnet synchronous generator (PMSG)-based stand-alone wind energy conversion system (SWECS) which uses quasi-Z-source inverter (qZSI) with battery as interface between the PMSG and the load. In order to better control the active power balance and maintaining the stability of the dc-link voltage during over-generation condition of the SWECS, a dump load is used in the proposed system. The proposed control system is able to provide an uninterrupted and reliable supply to sensitive loads under variable power generation of the SWECS and sudden changes in the load demand. Moreover, the maximum wind power capturing and delivering this power to the load is considered in the proposed control system. The simulation results validate proper operation and theoretical analysis of the proposed SWECS.

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