乌东德与滇西北共用接地极线对直流输电系统影响研究

Research on the Influence of the Common Ground Electrode Line Between Wudongde and NorthwestYunnan on the HVDC Transmission System

针对两回直流共用接地极线的两种方案,在构建共用接地极线的直流输电系统稳态模型的基础上,研究共用接地极线方案对两回直流控制系统、保护系统的影响,并对相应的解决措施进行了分析。对直流保护系统,接地极线路相关故障时,有双回直流闭锁的风险。

Aiming at the two schemes of two DCs sharing the grounding electrode line,on the basis of constructing the steady-state model of the DC transmission system with the common grounding electrode line,the influence of the common grounding electrode line scheme on the two-circuit DC control system and protection system is studied.The corresponding solutions are analyzed.For DC protection systems,there is a risk of double-circuit DC blocking when there is a fault related to the grounding electrode circuit.