Three-level Inverter Discontinuous Pulse-width Modulation Strategy Considering Neutral Point Potential Balance

被引：0

作者：

Sun Q. ^{[1
]}

Wu X. ^{[1
]}

Tang F. ^{[2
]}

机构：

[1] National Active Distribution Network Technology Research Center, Beijing Jiaotong University, Haidian District, Beijing

[2] Collaborative Innovation Center of Electric Vehicles in Beijing, Haidian District, Beijing

来源：

Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2017年 / 37卷

关键词：

Discontinuous pulse width modulation; Hybrid modulation; Neutral point balance; Redundant vector; Three-level;

D O I：

10.13334/j.0258-8013.pcsee.161080

中图分类号：

学科分类号：

摘要：

In high-power inverters, discontinuous pulse width modulation (DPWM) could increase the equivalent switching frequency, improve control performance of the system and reduce the difficulty of filter design with the same switching losses, but its neutral point balancing control had not been well resolved. To address this issue, this paper took the three-level DPWM1 as an example. The realization method of the three-level DPWM1 based on the space vector pulse width modulation was analyzed. The influence of three-level DPWM1 and its redundant vector sequence (DPWM3) on the midpoint potential was quantitatively analyzed by using the neutral point balance control method of continuous modulation. A hybrid modulation strategy based on DPWM1 and DPWM3 was proposed, which could effectively control the balance of neutral point potential. During the adjustment period, the switching frequency was almost constant, and hysteresis control was adopted to switch between the two modulation algorithms. The common vectors of each small sector of the two modulation algorithms were selected as the switching vectors, which could reduce the extra switching action caused by the switch. Finally, the simulation and experimental results verify the feasibility of the modulation strategy. © 2017 Chin. Soc. for Elec. Eng.

引用

页码：177 / 185

页数：8

共 21 条

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