Adaptive PWM for four-switch three-phase inverter

作者：Zhou, Wenzhi; Sun, Dan^*

来源：Electronics Letters, 2015, 51(21): 1690-1691.

DOI：10.1049/el.2015.1584

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.

• 出版日期2015-10-8
• 单位浙江大学