Pulse Width Modulation Strategy for Eliminating Common-Mode Voltage in T-Type Three-Level Inverters Considering Dead Time

This study focuses on the T-type three-level voltage source inverter, offering two key methods for achieving zero common-mode voltage pulse-width modulation (ZCM-PWM): the space vector approach and the carrier-based approach. To address the challenge of common-mode voltage (CMV) fluctuations induced by dead-time (DT) effects during ZCMPWM, a novel and practical DT compensation method is proposed. This method entails delaying the rising or falling edge of the drive signal by a predetermined DT, based on the polarity of the output current, and subsequently incorporating DT into the compensated drive signal. Theoretically, the proposed enhanced ZCM-PWM method effectively eliminates the adverse effects of DT on CMV while maintaining a simple and practical implementation framework.