Modulation method and apparatus based on three-phase neutral point clamp inverter

摘要

Embodiments of the present invention disclose a modulation method and apparatus based on a three-phase neutral point clamp inverter. The method controls all switch elements of one of the three bridge arms to be in a non-conducting state, and transmits the states of the switch elements of the other two bridge arms to a three-phase neutral-point-clamped inverter. The two bridge arms are controlled to output a phase signal, and the two bridge arms are referred to as a first single-phase bridge arm and a second single-phase bridge arm. Providing a return loop for the induced current of the inverter in controlling both the switch element connected to the first input terminal and the switch element connected to the second input terminal to be non-conductive. For this purpose, a control signal for controlling two of the other switch elements in the first single-phase bridge arm and the second single-phase bridge arm to be conductive is output. Including that. The scheme provided by embodiments of the present invention has relatively low current ripple, lower switch tube loss, and lower inductor loss, improving the efficiency of the inverter. [Selection diagram] FIG.