基于Sigma-Delta调制的双两电平逆变器调制策略

doi:10.19595/j.cnki.1000-6753.tces.160373

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Abstract Sigma-Delta converter can optimize the spectrum of the inverter and decrease the noise of the system in the modulation strategy of multi-level inverter. However, when using in the open-end winding induction motor fed by dual two-level inverters with common DC link, the traditional modulation strategy by changing short vector operation time to eliminate zero-sequence voltage is not applicable, because of the unfixed switch state and switch frequency. In this paper, a novel modulation strategy for dual two-level inverters with common DC link is proposed. The proposed method uses oversampling and noise shaping technology of Sigma-Delta modulator to optimize the voltage spectrum of the inverter. Meanwhile, according to the principle that the corresponding zero-sequence voltage value of two equivalent basic vectors is zero when the two vectors have a phase difference of 120° in two-level space vector diagram, the reference vector can be decomposed into two equivalent vectors generated by two inverters respectively with equal magnitude and an angle different of 120°. The proposed method can eliminate the value of zero-sequence voltage in dual two-level inverter with common DC link absolutely. Simulation and experimental results have verified the proposed method.

Key words： Sigma-Delta converter zero-sequence voltage dual inverter with common DC link voltage spectrum

Published: 10 October 2017

PACS:

TM464

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	Articles by authors
	Geng Yiwen
	Wang Liang
	Xu Jiabin
	Wei Chenxi

Cite this article:

Geng Yiwen,Wang Liang,Xu Jiabin等. A Modulation Strategy of Dual Inverter Using Sigma-Delta Converter[J]. Transactions of China Electrotechnical Society, 2017, 32(18): 239-247.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.160373 OR https://dgjsxb.ces-transaction.com/EN/Y2017/V32/I18/239

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