特高压和高压直流输电系统共用接地极模式分析

Analysis on the common grounding electrode mode for UHVDC and HVDC power transmission systems

为了节省占地面积和建设费用,云广特高压直流输电系统和贵广二回高压直流输电系统在广东侧决定采用共用接地极模式。讨论了特高压和高压输电系统的共用接地极模式,对共用接地极的要求提出了设计方案。分析了共用接地极对2个直流输电系统的稳态运行、过电压绝缘配合以及控制保护系统的影响。结果表明:云广特高压直流输电系统和贵广二回高压直流输电系统共用接地极模式是可行的。

In order to save the occupied area and the engineering cost it has been decided to adopt a mode of common grounding electrode for Yun-Guang UHVDC and Gui-Guang Ⅱ HVDC transmission systems. The common grounding electrode mode for UHVDC and HVDC power transmission systems and the requirements were discussed, and the schemes for the electrode were put forward. The influences of the common grounding electrode on stable-state operation, over-voltage and insulation coordination, or control and protection systems were analyzed for UHVDC and HVDC power transmission systems. The results show that all the effects are small, and the common grounding electrode mode for UHVDC and HVDC power transmission systems is feasible.