Detection of fault in VSI of Vector controlled induction motor drive system

This paper proposes a simple and cost effective fault diagnosis technique in Vector controlled Pulse width Modulated Voltage Source Inverter. Current errors generated by comparing reference currents and actual currents are used to diagnose the fault behavior. Distribution of three phase currents is divided into six stages. During fault occurrence some of these six stages are healthy and some are faulty. Using distortions in current errors these healthy and faulty stages are determined then fault can be diagnosed. Simulations by MATLAB/ Simulink are carried out for single switch and double switch fault to check effectiveness of proposes fault detection.