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The Research of an Optimized Three-Level SVPWM Strategy

Three-level converter is a hot spot in the field of high power commutation research and application, and one of its key technologies is modulation strategy that deserves attention. Traditional space vector pulse width modulation (SVPWM) has some disadvantages such as complex algorithm and large amount of computation. For this, an optimized strategy is proposed. By redividing the vector sector, the three-level SVPWM is converted into two-level SVPWM. And the mature and simple seven-stage two-level SVPWM technology is used to obtain the control of equivalent switching state, which simplifies the calculation and is easier to be realized digitally. At the same time, according to the characteristics of this modulation strategy, a neutral point voltage balance control method is proposed. Finally, the feasibility of this strategy is proved by simulation experiments.