Fault Tolerant Converter for DFIG connected to DC-bus based Wind Energy Systems

This paper proposes a fault tolerant converter used in Doubly Fed Induction Generator (DFIG) connected to DC-bus for wind energy applications. The proposed fault tolerant inverter is based on four leg where the fourth leg is used to replace the faulty leg. In this study, we propose a new topology of DFIG connected to the DC-bus through uncontrolled rectifier in stator side. In order to control of the output system, A Field Oriented Control (FOC) scheme is adopted in this study. The open-switch fault is studied and a fault detection scheme is proposed. The proposed fault scheme is carried out by analyzing the rotor currents within healthy and faulty operation conditions. Simulation results are presented in this paper to validate the proposed fault tolerant inverter.