特高压绝缘架空地线直流融冰问题分析  

Analysis of DC Ice-Melting Problem of UHV Insulated Overhead Ground Wire

作　　者：赵禹来 张健聪 吴胥阳 王颖剑 周旺 ZHAO Yulai;ZHANG Jiancong;WU Xuyang;WANG Yingjian;ZHOU Wang(State Grid Jinhua Power Supply Company,Jinhua,Zhejiang 321016,China)

机构地区：[1]国网金华供电公司,浙江金华321016

出　　处：《东北电力技术》2025年第3期51-54,共4页Northeast Electric Power Technology

摘　　要：特高压线路覆冰可导致线路地线断裂,系统输电量大大下降,给国民经济生活带来一定负面影响。直流融冰技术可有效解决覆冰问题,但直流融冰对电网系统也会造成较多问题。根据±800 kV宾金地线直流融冰试验可知,地线远端接地方式下会导致电力系统中性点电压偏移、引起变电站母线3U 0告警及高次谐波含量较高等问题;根据现场实际试验和原理分析,在直流融冰装置和电网之间加装隔离变压器或整流变压器能够有效隔离远端接地信号,解决中性点电压偏移的影响;通过将6脉冲地线直流融冰装置改为12脉冲地线直流融冰装置,可有效提高直流电输出平滑度,降低高次谐波含量;同时设计一种整流变压器和12脉冲地线直流融冰装置的组合形式,进一步提升地线直流融冰单极大地运行方式下的可行性。The icing of UHV lines can cause the ground wire of the line to break,and the power transmission of the system is greatly reduced,which will cause damage to the national economic life.DC ice-melting technology can effectively solve the icing problem,but DC ice-melting will also cause many problems to the power grid system.According to the DC ice-melting test of±800 kV Binkin ground wire,the remote grounding of the ground wire will lead to the neutral point voltage deviation of the power system,and cause the 3U 0 alarm of the substation bus,and the higher harmonic component is also high.According to the actual field test and principle analysis,it adds isolation transformer or rectifier to effectively isolate the remote ground signal between the DC ice-melting device and the power grid,solving the influence of neutral point voltage deviation.By changing the 6-pulse ground wire DC ice-melting device to 12-pulse ground wire DC ice-melting device,it can improve the output smoothness of DC effectively and reduces the high harmonic content.

关 键 词：绝缘架空地线 直流融冰 中性点电压偏移 高次谐波 

分 类 号：TM752[电气工程—电力系统及自动化]