三电平牵引变流器改进同步空间矢量调制策略

doi:10.19595/j.cnki.1000-6753.tces.190966

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Abstract Due to the limitation of switching loss, the switching frequency of three-level traction inverter for high-speed railway and urban railway is usually low than 1kHz. If the inverter is operated in the medium and high frequency regions, the decrease of carrier ratio will lead to the increase of low-order harmonics in the output voltage, so synchronous modulation strategy should be adopted. The conventional strategy can only guarantee the synchronization and symmetry of the output waveform, and fails to further optimize the quality of the output waveform. As a result, the amplitudes of low-order harmonics in the output waveform are still high. The design rules of switching sequence for the synchronous space vector modulation (SVM) were deduced according to the restriction of synchronization, three-phase symmetry, half-wave symmetry and quarter-cycle symmetry. Then an alternative switching sequence set was established, and the optimal switching sequence was obtained by evaluating the weighted total harmonic distortion. Simulation and experimental results show that the proposed strategy can effectively improve the output waveform quality of traction inverter.

Key words： Three-level inverter synchronous modulation space vector modulation (SVM) harmonic distortion

Received: 28 July 2019

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TM464

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	Zhang Guozheng
	Chen Wei
	Gu Xin
	Li Xinmin
	Zhou Zhanqing

Cite this article:

Zhang Guozheng,Chen Wei,Gu Xin等. An Improve Synchronized Space Vector Modulation Strategy for Three-Level Inverter[J]. Transactions of China Electrotechnical Society, 2020, 35(18): 3908-3916.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.190966 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I18/3908

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