UHVDC分极分层接入方式及其运行特性

doi:10.19595/j.cnki.1000-6753.tces.161125

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Abstract Based on the existing hierarchical connection mode, this paper puts forward a new hierarchical connection mode by pole. Firstly, according to the two hierarchical connection modes of ultra high voltage direct current (UHVDC) transmission system connecting to the receiving grid. the economic, multi-infeed short circuit ratio indexes are compared and analyzed. Then based on the PSCAD/EMTDC simulation platform, the simulation systems for 800kV UHVDC transmission system connecting to 500kV/1 000kV receiving grid are built. Finally, the steady-state, dynamic and transient characteristics of two connection modes are compared. The results show that the hierarchical connection mode by pole can not only effectively improve the multi-infeed short circuit ratio (MISCR) of receiving grid and enhance the voltage supporting ability, but also has good static and dynamic responses. More importantly, the hierarchical connection mode by pole can achieve the layered isolation of commutation failure and improve the reliability of UHVDC. The disadvantage of hierarchical connection mode by pole is that grounding current is too large when monopolar total outage or bipolar power is unbalanced. In this regard, this paper proposes the measures to suppress ground electrode current.

Key words： Ultra high voltage direct current (UHVDC) hierarchical connection by pole multi-infeed short circuit ratio (MISCR) commutation failure layered isolation fault recovery

Received: 19 July 2016 Published: 05 March 2018

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TM72

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	Wang Ling
	Wen Jun
	Si Ruihua
	Yu Ze
	Liu Lianguang

Cite this article:

Wang Ling,Wen Jun,Si Ruihua等. The Connection Mode and Operation Characteristics of UHVDC with Hierarchical Connection by Pole[J]. Transactions of China Electrotechnical Society, 2018, 33(4): 730-738.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.161125 OR https://dgjsxb.ces-transaction.com/EN/Y2018/V33/I4/730

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