Open circuit switch fault diagnosis methods for VSI fed induction motor drive

This paper is a brief survey of various existing methods for an open circuit switch fault diagnosis methods with special focus on three phase voltage source inverters. 15 such methods for open circuit faults has been studied and compared. A new real time fault diagnosis method for three phase pulse width modulated voltage source inverter fed vector controlled induction motor drive is presented in a brief which can detect both single and double switches faults. By the proposed method it has a tendency to get high potency compared with all existing methods. Finally the MATLAB/SIMULINK simulations are carried out which shows the effectiveness and merits of the proposed method.