T型三电平逆变器合成脉冲宽度调制相电流重构策略

doi:10.19595/j.cnki.1000-6753.tces.220180

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Abstract The traditional single-current sensor based phase current reconstruction technology used to modulate the space vector pulse width in the T-type three-level inverter has an unobservable region. Therefore, the sampling principle of the T-type three-level neutral current and the existence mechanism of the unobservable region of the neutral current are analyzed, and a phase current reconstruction strategy combined with the neutral current single-sensor sampling and pulse width modulation is proposed. By compensating the observable voltage vector that does not meet the minimum sampling time requirement in different regions, and using the composite zero vector principle to satisfy the principle of volt-second balance, the unobservable region is eliminated. It is shown that the current reconstruction error of the proposed method is less than 2.5%, and the phase current total harmonic distortion is less than 3.21%, which can provide accurate reconstructed phase current for the control system.

Key words： T-type three-level inverter neutral current phase current reconstruction composite space vector pulse width modulation minimum sampling time

Received: 10 February 2022

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TM341

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	Shen Yongpeng
	Wang Shuaibing
	Liang Weihua
	Liu Dongqi
	Wang Yanfeng

Cite this article:

Shen Yongpeng,Wang Shuaibing,Liang Weihua等. T-Type Three-Level Inverter Composite Pulse Width Modulation Phase Current Reconstruction Strategy[J]. Transactions of China Electrotechnical Society, 2022, 37(20): 5302-5312.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.220180 OR https://dgjsxb.ces-transaction.com/EN/Y2022/V37/I20/5302

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