Fault Diagnosis for Open-Circuited Faults in 3-Phase Uncontrolled Rectifier of Wind Energy Power Conversion Systems

This paper proposes an open-circuited (OC) fault diagnosis methodology for 3-phase uncontrolled rectifier used in wind energy power conversion systems. We have developed the fault diagnosis algorithm using a signal based method, where the magnitude and phase of fundamental and other harmonic components of the rectified DC voltage play a major role. The novelty of the proposed scheme lies in identification of exact location of OC diode(s), which is established by introducing a specifically designed resistance. The effectiveness of the proposed scheme is demonstrated on a variable power fed 3-φ uncontrolled rectifier connected to the boost converter.