基于无差拍控制的T型三电平逆变器中点电位平衡策略

doi:10.19595/j.cnki.1000-6753.tces.161978

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Abstract To solve the problem of neutral point (NP) potential unbalancing of three-level T-type inverter, this paper puts forward a NP potential balancing strategy based on deadbeat control algorithm. Firstly, a mathematical relationship among NP potential variation, phase current and duty cycle of switch vectors was built. Then, an evaluation index describing the ability of regulating NP potential of short vector was introduced, i.e. when two short vectors existed simultaneously, different switching modulation methods were chosen through comparing their regulation capabilities. Thereby, a NP potential balancing method based on a deadbeat control algorithm was established. The duty cycle of the short vector, whose regulation ability was stronger, was adjusted to fast realize the NP potential balancing. The simulation and experimental results show that the proposed method has a good performance on NP potential balancing. It can suppress the NP potential fluctuation while reducing the harmonics of output voltage and current.

Key words： Three-level T-type inverter neutral point potential balancing regulation ability space vector pulse width modulation short vector deadbeat control

Received: 17 December 2016 Published: 24 April 2018

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TM464

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	Feng Teng
	Kang Longyun
	Hu Bihua
	Feng Yuanbin

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Feng Teng,Kang Longyun,Hu Bihua等. A Neutral Point Potential Balancing Strategy for Three-Level T-Type Inverter Based on Deadbeat Control[J]. Transactions of China Electrotechnical Society, 2018, 33(8): 1827-1834.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.161978 OR https://dgjsxb.ces-transaction.com/EN/Y2018/V33/I8/1827

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