SiC device four-level split output inverter half-cycle time-sharing modulation method and system

The invention belongs to the technical field of power electronics, and relates to a SiC device four-level split output inverter half-cycle time-sharing modulation method and system, and the method comprises the steps: obtaining a modulation wave after positive half-cycle injection according to an upper DC bus voltage source, a middle DC bus voltage source and a lower DC bus voltage source in the positive half-cycle injection process of the modulation wave; in the process of injecting the modulation wave in the negative half cycle, obtaining the modulation wave after the negative half cycle injection according to the upper, middle and lower direct current bus voltage sources; in the time-sharing generation process of the positive half-cycle driving signal and the time-sharing generation process of the negative half-cycle driving signal, a driving signal for positive half-cycle time-sharing comparison and a driving signal for negative half-cycle time-sharing comparison are obtained respectively; and finally, a