高压直流不停电方式下接地极线路融冰模式探讨  

Discussion on Ice Melting Mode of Grounding Electrode Line in HVDC System Uninterrupted Mode

作　　者：代书龙 周亚树 刘百爽 滕昭林 辛亮 徐学海 童冰[1] DAI Shulong;ZHOU Yashu;LIU Baishuang;TENG Zhaolin;XIN Liang;XU Xuehai;TONG Bing(Qujing Bureau,CSG EHV Power Transmission Company,Qujing 655000,China)

机构地区：[1]中国南方电网超高压输电公司曲靖局,云南曲靖655000

出　　处：《电工技术》2022年第17期146-148,153,共4页Electric Engineering

摘　　要：为避免接地极线路融冰期间直流输电系统停运,提高直流输电系统可靠性和可用率,对直流输电系统处于双极平衡运行方式、单极金属回线运行方式及同塔双回直流接地极线路接线方式进行研究,发现双极平衡运行时中性母线区域电压接近零,单极金属回线方式运行时接地极线路自动与直流系统隔离。根据以上直流系统固有特性,提出对应直流系统不停电时接地极线路融冰策略。又根据同塔双回直流系统共用接地极的特点,提出三种直流系统不停电方式下接地极线路融冰策略,结合实际工程运行情况可选择相应的融冰模式,所提方案可为后续直流系统接地极线路融冰设计提供参考。In order to avoid the power failure of HVDC transmission system during ice melting of grounding electrode line,and improve the reliability and availability of HVDC system,the DC transmission system in the bipolar balanced operation mode,the single-pole metal circuit operation mode and the double-circuit DC grounding line wiring mode on the same tower is studied.It is found that because the voltage in the neutral bus area is close to zero during bipolar balanced operation,the ground electrode line is automatically isolated from the DC system during single-pole metal loop operation.According to the above inherent characteristics of the DC system,the ice-melting strategy of the ground electrode line is proposed when the DC system is not powered off.According to the characteristics of the shared grounding electrode of the double-circuit DC system on the same tower,three strategies for the ice-melting of the grounding electrode line under the non-stop mode of the DC system are proposed.The corresponding ice-melting mode can be selected according to the actual engineering operation.The proposed scheme can provide a reference for the ice-melting design of the ground electrode line of the subsequent DC system.

关 键 词：高压直流 不停电 接地极线路 融冰 

分 类 号：TM721.1[电气工程—电力系统及自动化]