A Novel Carrier-Overlapped PWM Method for Four-Level Neutral-Point Clamped Converters
A Novel Carrier-Overlapped PWM Method for Four-Level Neutral-Point Clamped Converters
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DOI：
10.1109/tpel.2018.2833148
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发表时间：
2019-01
影响因子：
6.7
通讯作者：
Kui Wang;Zedong Zheng;Yongdong Li
中科院分区：
文献类型：
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作者：
Kui Wang;Zedong Zheng;Yongdong Li
三电平以上的中点箝位型多电平变流器直流侧电容电压难以平衡，限制了其在工业上的应用。为了解决四电平NPC变换器的中点电位平衡问题，本文提出了一种新型的载波重叠脉宽调制（PWM）方法，该方法满足伏秒平衡原理，可以实现理想稳态下三个直流链电容的自然电压平衡。实验结果证实了这种PWM方法的有效性。
Neutral-point clamped (NPC) multilevel converters with more than three voltage levels are hard to balance the dc-link capacitor voltages, which limits their application in the industry. In order to solve the neutral-point potential balancing problem of four-level NPC converters, a novel carrier-overlapped pulsewidth modulation (PWM) method is proposed in this letter, which satisfies the volt-second balance principle and can achieve the natural voltage balance of three dc-link capacitors under ideal and steady states. Experimental results are presented to confirm the validity of this PWM method.