OPEN SWITCH FAULT DIAGNOSIS IN THREE PHASE INVERTER USING DIAGNOSTIC VARIABLE METHOD

Mala Ratan Ubale, R. B. Dhumale, S. D. Lokhande

Abstract: The reliability of power electronics system such as three phase inverter is important in various applications. Different types of faults occur in it, which may influence the operation of system. Such faults require unexpected maintenance, which increases the cost of manufacturing. Therefore fault diagnosis of such devices plays vital role in industry. One possible fault that occurs in inverter is an open switch fault. This paper provides a new technique based on diagnostic variable which detects single as well as multiple open switch fault in three phase inverter. In this method, diagnostic variables are used to detect faulty phase. Along with these diagnostic variables, an average current of three phase inverter is used for the detection of single as well as multiple faulty switches.

Keywords: Power electronics, open switch fault, diagnostic variables

DOI: https://doi.org/10.15623/ijret.2013.0212108