Current Sensor Fault Detection, Identification, and Reconfiguration for Doubly Fed Induction Generators

This work presents current sensor fault detection, identification and reconfiguration for a voltage oriented controlled doubly fed induction generator. The focus of this analysis is on the identification of the faulty sensor, and the actual reconfiguration. It is proposed to temporary switch from closed loop into open loop control to decouple the drive from faulty sensor readings. During a short period of open loop operation, the fault is identified. Then replacement signals from observers are used to reconfigure the drive and re-enter closed loop control. Measurement results are included to prove that the proposed concept leads to good results.