青豫直流受端中点分压器投退策略研究

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Abstract The receiving side of Qingyu HVDC is hierarchically connected to two 500kV AC grid, which has spilt and closed loop opera-tion modes. HVDC system needs to be compatible with hierarchical and non-hierarchical control modes. This paper intro-duced AC/DC power grid structure characteristics of Qingyu HVDC, analyzed the influence of DC midpoint voltage divider fault on HVDC and the shortage of existing coping strategies. Then, the entry & exit strategy of midpoint voltage divider which can adapt to the structure characteristics of Qingyu HVDC is proposed. At the same time, the risk of HVDC operation caused by long-term use of calculated value of control system after mid-point voltage divider fault is avoided. It also solves the problem of long-time block of the converter after non-electric protection action of midpoint voltage divider, and improves the available rate of HVDC operation.

Key words： hierarchical connection HVDC midpoint voltage divider failure measuring point switching bus connection switch

Received: 18 September 2020

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	Articles by authors
	LIU Kai
	ZOU Qiang
	ZHANG Qingwu
	XIAO Jianmin
	LIU Xiaohui

Cite this article:

LIU Kai,ZOU Qiang,ZHANG Qingwu等. Research on entry and exit strategy of midpoint voltage divider in receiving side of Qingyu HVDC[J]. Electrical Engineering, 2021, 22(4): 20-25.

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http://dqjs.cesmedia.cn/EN/Y2021/V22/I4/20

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