| 摘要: |
| 根据临近三矢量脉宽调制原理，提出一种适用于两电平Z源逆变器的抑制共模电压调制方法，该方法通过比较2条调制波信号与1条载波信号，产生的脉宽调制信号分别控制逆变器每相桥臂的上、下2只开关管，并给出了2条调制波的生成方法。对所提调制方法的适用性进行了分析，结果表明该方法不存在调制比使用限制。仿真及实验结果均证实，所提出的抑制Z源逆变器共模电压的调制方法，不但可以将Z源逆变器输出共模电压限制在逆变桥输入电压峰值的1／３，而且输出电压不存在低次谐波畸变。 |
| 关键词: 逆变器 Z源逆变器 共模电压 脉宽调制 电压控制 |
| DOI： |
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| Common-mode voltage suppression by PWM for Z-source inverter |
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ZHANG Jin1,2,3
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1.Institute of Electrical Engineering，Chinese Academy of Sciences，Beijing 100190，China;2.Key Laboratory of Power Electronics and Electric Drive，Chinese Academy of Sciences，Beijing 100190，China;3.Beijing Engineering Laboratory of Electrical Drive System & Power Electronic Device Packaging Technology，Beijing 100190，China
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| Abstract: |
| A method of common-mode voltage suppression based on NSPWM（Near-State PWM） is proposed for two-level Z-source inverter，which compares two modulation signals with one carrier signal to generate PWM signals for controlling respectively the upper and lower switching devices of each leg. The way to generate two modulation waves is described and its adaptability is investigated，which shows that the proposed method has no modulation index limitation. Simulative and experimental results demonstrate that，with the proposed method，the output common-mode voltage of Z-source inverter is limited to one third of the input peak voltage and the output voltage has no low-order harmonic distortion. |
| Key words: electric inverters Z-source inverter common-mode voltage pulse width modulation voltage control |
