Neutral-Point Voltage Balancing Method for Five-Level NPC Inverters Based on Carrier-Overlapped PWM
Neutral-Point Voltage Balancing Method for Five-Level NPC Inverters Based on Carrier-Overlapped PWM
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基于载波重叠PWM的五电平NPC逆变器中点电压平衡方法
DOI：
10.1109/tpel.2020.3006960
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发表时间：
2021-02
影响因子：
6.7
通讯作者：
Li Yongdong
中科院分区：
文献类型：
--
作者：
Wang Kui;Zheng Zedong;Xu Lie;Li Yongdong
中点电压不平衡是五电平中点箝位逆变器的主要问题之一，影响了其在工业上的应用。为了解决这一问题，本文提出了一种基于载波重叠脉宽调制（COPWM）的闭环中点电压平衡方法。四个直流链路电容器电压通过三个步骤平衡：两个外部电容器之间的电压平衡，两个内部电容器之间的电压平衡，以及两个内部电容器和两个外部电容器之间的电压平衡。研究了中性点电流与参考电压的关系，并通过零序电压注入来平衡直流母线上、下电容电压。通过调节开关信号的宽度来平衡两个内部电容电压。仿真和实验结果证实了该方法的有效性。
Neutral-point voltage imbalance is one of the main problems of five-level neutral-point clamped inverters that impedes their industrial application. In order to solve this problem, a closed-loop neutral-point voltage balancing method based on carrier-overlapped pulsewidth modulation (COPWM) is proposed in this article. The four dc-link capacitor voltages are balanced by three steps: voltage balancing between the two outer capacitors, voltage balancing between the two inner capacitors, and voltage balancing between the two inner and the two outer capacitors. The relationship between the neutral-point currents and the reference voltage is studied, and the top and the bottom dc-link capacitor voltages are balanced by zero-sequence voltage injection. The two inner capacitor voltages are balanced by adjusting the width of switching signals. Simulation and experimental results are presented to confirm the validity of this method.
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DOI：
10.1109/jestpe.2013.2294920
发表时间：
2014-03
影响因子：
5.5
作者：
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通讯作者：
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影响因子：
6.7
作者：
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影响因子：
6.7
作者：
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影响因子：
7.7
作者：
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DOI：
10.1109/ias.2005.1518362
发表时间：
2005
期刊：
Fourtieth IAS Annual Meeting. Conference Record of the 2005 Industry Applications Conference, 2005.
影响因子：
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作者：
H. Akagi;H. Fujita;S. Yonetani;Y. Kondo
通讯作者：
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