二极管钳位型三电平逆变器共模电压抑制

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摘要二极管钳位型（NPC）三电平逆变器是一种应用广泛的多电平逆变器结构。中点电位不平衡是NPC三电平逆变器固有的缺点。传统虚拟空间矢量调制（NTV²）能在输出电压全范围内控制中点电位平衡,但其产生的共模电压较大。针对上述缺点,提出了一种新型NTV²方法,选用产生共模电压较小的基本电压矢量合成新的虚拟小矢量和虚拟中矢量。同时,提出相占空比法,降低了新型NTV²方法的开关频率,使其开关频率固定。仿真和实验结果验证了新型NTV²方法能够有效地抑制共模电压,且在输出电压全范围内控制中点电位平衡。

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	吴可丽
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关键词 ：三电平逆变器, 共模电压, 中点电位平衡, 虚拟空间矢量, 相占空比法

Abstract：Neutral point clamped (NPC) three-level inverter is a widely used multilevel inverter topology. The neutral-point potential imbalance is the main drawback of NPC three-level inverter. The traditional NTV² modulation strategy can control the voltage balance over the full range of inverter output voltage. However, the inverter output side will produce high common-mode voltage. This paper proposes a new NTV² modulation strategy to solve the high common-mode voltage problem generated by the traditional NTV² modulation. This modulation selects the basic voltage vector that generates smaller common-mode voltage to synthesis a new small virtual vector and middle virtual vector. At the same time, the duty ratio method is put forward, to reduce and fix the switching frequency of the new NTV² modulation. The simulation and experimental results show that the new NTV² modulation can effectively suppress common-mode voltage, and it can also control the neutral-point voltage balance over the full range of inverter output voltage.

Key words： Three-level inverter common-mode voltage neutral-point potential balance nearest three virtual vectors phase duty cycle method

收稿日期: 2013-12-31 出版日期: 2015-12-30

PACS:

TM464

基金资助:国家重点基础研究发展计划（973计划）（2013CB035602）和国家自然科学基金（51207104）资助项目

作者简介: 吴可丽女,1989年生,硕士,研究方向为三电平变换器。夏长亮男,1968年生,教授,博士生导师,研究方向为电机系统及其控制。

引用本文:

吴可丽, 夏长亮, 张云, 谷鑫. 二极管钳位型三电平逆变器共模电压抑制[J]. 电工技术学报, 2015, 30(24): 110-117. Wu Keli, Xia Changliang, Zhang Yun, Gu Xin. Common-Mode Voltage Suppression for Neutral-Point-Clamped Three-Level Inverter. Transactions of China Electrotechnical Society, 2015, 30(24): 110-117.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2015/V30/I24/110

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