Abstract
To deal with the performance and service continuity of doubly fed induction generator (DFIG) based wind energy conversion systems (WECSs) during open-switch Insulated Gate Bipolar Transistor (IGBT) fault, a fault-tolerant Voltage Source Inverter (VSI) is proposed. The fault-tolerant VSI is designed with redundancy leg to replace the faulty leg after open-switch fault occurrence. In this investigation, we propose a new topology of DC-Bus tied DFIG based on uncontrolled rectifier in stator side. A Field Oriented Control (FOC) scheme is used in this paper to control the DFIGURE The open-switch IGBT fault is studied and a fault detection scheme based on rotor currents analysing within healthy and faulty conditions is proposed. Case study results show that the proposed fault-tolerant VSI can ensure the service continuity of DFIG-DC system. Experimental results are presented in this paper to validate the proposed fault detection scheme.
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