Sensorless control of single voltage source converter-based doubly fed induction generator for variable speed wind energy conversion system

Abstract

This study deals with the analysis, design and control of single voltage source converter (VSC)-based grid connected doubly fed induction generator (DFIG) for wind energy conversion system (WECS) with maximum power point tracking capability. This proposed system uses stator flux-based model reference adaptive system algorithm for the sensorless rotor position estimation. In this proposed topology, grid side converter is replaced by a battery energy storage system (BESS) in the dc link. The designs of all the components such as BESS, VSC and wind turbine are explained in detail. This proposed topology is implemented using a digital signal processor. This developed WECS is tested extensively in sub-synchronous, synchronous and super-synchronous speeds regions and test results are presented in all these cases. The performance of this proposed topology is demonstrated for the dynamics in wind speed by the experimental verification. A comparative study of proposed single VSC-based WECS system is made with the conventional double VSC-based DFIG.