PUBLICATIONS

Fault diagnosis technique of electrical drives is becoming more and more important, since voltage fed converter system has become

industrial standard in many applications. Many studies have been conducted an inverter fault diagnosis for induction motors.

However, there are few researches about fault diagnosis of 3-phase ac/dc PWM (Pulse Width Modulation) converter compared to

the dc/ ac inverter. The ac/dc converter is the opposite of dc/ac inverter at current flow. Also, inverter and converter have different

current patterns under the same condition of IGBT (Insulated gate bipolar transistor) open switch fault. Therefore, it is difficult to

apply intact diagnosis methods of inverter to the converter. This paper proposes modified fault detection methods for IGBT open

switch fault in 3-phase ac/dc PWM converter by modifying established fault diagnostic methods for dc/ac inverters