不平衡电网电压下柔性直流输电系统功率滑模补偿策略

doi:10.19595/j.cnki.1000-6753.tces.170655

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Abstract Under the influence of unbalanced grid voltage, the double line-frequency ripple will appear in the output power of voltage source converter based high voltage direct current transmission (VSC-HVDC). In this paper, the mathematical model of VSC under unbalanced grid voltage is first analyzed, and the double line-frequency ripple of the VSC converter power is consequently ascribed to current factor and voltage factor. Then the double line-frequency power control equation is established, and a power sliding mode variable structure compensation control of VSC-HVDC is proposed to suppress the ripple power caused by current factor and voltage factor. In this case, the double line-frequency power fluctuation and the distorted output current can be suppressed at the same time, hence the system dynamic performance in variable operating conditions can be ensured. The compensation control is introduced into the original vector control and can separately control the double line-frequency component effectively under unbalanced grid voltage, which will not affect system normal operating. The proposed strategy is verified by the simulations of a two-terminal VSC-HVDC in PSCAD/EMTDC.

Key words： Unbalanced grid voltage VSC-HVDC double line-frequency ripple current factor and voltage factor sliding mode variable structure control

Received: 17 May 2017 Published: 27 July 2018

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TM721.1

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	Articles by authors
	Liu Ziwen
	Miao Shihong
	Fan Zhihua
	Wei Dehua
	Tu Qingyu

Cite this article:

Liu Ziwen,Miao Shihong,Fan Zhihua等. Power Sliding Mode Compensation Strategy of VSC-HVDC under Unbalanced Grid Voltage[J]. Transactions of China Electrotechnical Society, 2018, 33(14): 3296-3305.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.170655 OR https://dgjsxb.ces-transaction.com/EN/Y2018/V33/I14/3296

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