A fault detection and tolerant scheme for back-to-back converters in DFIG-based wind power generation systems

A new open-circuit fault diagnosis scheme, which is capable for detecting one or two open-circuit fault of power switches in the back-to-back converter of a DFIG wind power generation system is proposed. A redundant topology for the back-to-back converter is set out enabling reconfiguration of the converter circuit once the faulty device or devices is identified and isolated. Simulation results show that the proposed scheme allows the wind power generator to carry on generating even with the loss of one of the limbs in the converter and hence preventing complete shut down.