Fault tolerant back-to-back converter topology for wind turbine with Doubly Fed Induction Generator

This paper presents a novel fault tolerant converter topology for grid connected Wind Energy Conversion System (WECS) with Doubly Fed Induction Generator (DFIG). This topology allows fast fault detection and compensation of one of the semiconductors or drivers by using isolating and connecting devices. It is based on a unique redundant leg for both back to backconverters. We present a new detection algorithm, robust to false fault detection due to semiconductor switching. Simulation results are presented cases on both back-to-back converters and both hyper and hypo synchronous conditions.