4th China International Youth Conference on Electrical Engineering (CIYCEE 2023)

This paper introduces 240-degree clamped pulse-width modulation strategy (240CPWM), traditional space vector modulation (SVPWM) and discontinuous pulse width modulation (DPWM1) for neutral-point-clamped three-level (NPC-3LI) inverters with front-end boost converters and provides a detailed analysis of the capacitor ripple current with three PWM strategies and derives the calculation expressions. 240CPWM is a minimum switching loss PWM method that reduces the switching loss by 85% at unity power factor and has almost the same total harmonic distortion (THD) as compared to SVPWM. In comparison, using 240CPWM can reduce the ripple current of the DC-link capacitor at full power factor, especially at high power factor, which will help reduce the volume on the DC side support capacitor.