A Level Shifted Pulse Width Modulated Multilevel Inverter Fault Analysis Technique

Multiple-level inverters are often used in extreme voltages and high-energy applications because of their excellent efficiency lately. Because of the considerable quantity of semiconductor switches involved in powers conversion, multilevel inverters (MLIs) are more likely to experience switch faults. Therefore, it is essential to find and discover defects as soon as possible. In this context, a technique depending on the level-shifted pulse width modulations (PWM) methodology is developed for diagnosing open-circuits errors in H-bridges multiple-level inverters (HMLI). Instead of utilizing an algorithm to detect faults, the proposed method uses subtle fault features and only requires a little amount of logical judgment. The loads current and H-bridges outputs voltages are utilized to diagnose faults.