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An adaptive pulse width modulation (PWM) strategy is proposed for four‐switch three‐phase inverter (FSTPI) to improve the performance and simplify the algorithm. The FSTPI has a split DC‐link and one phase of the AC load is connected to the neutral point. The conventional space vector PWM has a limited performance in the low‐frequency region since the phase currents are unbalanced due to the neutral‐point voltage fluctuation caused by the phase current flowing through the capacitors. To solve this problem, an adaptive PWM considering the neutral‐point voltage fluctuation is proposed. Moreover, sector identification is unnecessary thus the algorithm is simplified. Experimental results demonstrate the validity and feasibility of the proposed strategy.
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Zhou et al. (2015) studied this question.
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