FAULT TOLERANT CONTROL FOR VECTOR CONTROLLED INDUCTION MOTOR DRIVE

摘要

The present invention relates to a system and a method for current estimation and current sensor fault detection and isolation for a vector controlled Induction motor (IM) drive. The performance of the drive greatly relies on the feedback signals from the current sensor. A sudden failure in one of the current sensors degrades the performance of the drive. Moreover, if the fault is not detected and handled quickly, it can lead to failure of the system or make the controller unstable. In the proposed fault detection and isolation unit, the currents are estimated in two phase stationary reference frame. The proposed current estimation technique and fault tolerant controllers are simulated and experimentally validated.