Online Capacitor Monitoring Strategy in 3L-NPC Inverter Driven Open Winding Multiphase Drives

Capacitor monitoring plays a crucial role in evaluating inverter health. Traditional methods frequently require additional sensors or system operation adjustments. In this paper, we propose an online technique for monitoring capacitor, which relies on finely tuned duty cycles for 3L-Neutral-Point Clamped(NPC) inverter driven open winding multiphase motor systems. This strategy leverages the benefits of multiphase and multilevel systems, eliminating the need for additional sensors and minimizing potential impacts on output performance. The validity of the proposed method as demonstrated by experiments.