The Connection Mode and Operation Characteristics of UHVDC with Hierarchical Connection by Pole
Wang Ling1, Wen Jun1, Si Ruihua2, Yu Ze1, Liu Lianguang1
1. School of Electrical and Electronic Engineering North China Electric Power University Beijing 102206 China; 2. Henan Electrical Power Company Economic Research Institute Zhengzhou 450000 China;
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.
王玲, 文俊, 司瑞华, 蔚泽, 刘连光. UHVDC分极分层接入方式及其运行特性[J]. 电工技术学报, 2018, 33(4): 730-738.
Wang Ling, Wen Jun, Si Ruihua, Yu Ze, Liu Lianguang. The Connection Mode and Operation Characteristics of UHVDC with Hierarchical Connection by Pole. Transactions of China Electrotechnical Society, 2018, 33(4): 730-738.
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2018, Vol. 33 
