高压直流输电对地电场观测影响特征分析  

Analysis on Characteristics of Influence of HVDC on Geoelectric Field Observation

作　　者：李钟慧 王兰炜 张宇 张兴国 蒋延林 张秀霞[4] LI Zhonghui;WANG Lanwei;ZHANG Yu;ZHANG Xingguo;JIANG Yanlin;ZHANG Xiuxia(National Institute of Natural Hazards,Beijing 100089,China;Institute of Earthquake Forecasting,China Earthquake Administration,Beijing 100036,China;Gaoyou Seismic Station,Gaoyou 225600,China;Jiangsu Earthquake Agency,Nanjing 210014,China)

机构地区：[1]国家自然灾害防治研究院,北京100089 [2]中国地震局地震预测研究所,北京100036 [3]高邮地震台,高邮225600 [4]江苏省地震局,南京210014

出　　处：《高电压技术》2024年第3期1244-1251,I0024,共9页High Voltage Engineering

基　　金：中央级公益性科研院所基本科研业务费专项(CEAIEF20220503)。

摘　　要：随着我国“西电东送、南北互供、全国联网”基本战略的实施,多条高压直流输电线路投入运行,对地电场观测造成的干扰愈显突出。为此,总结了全国地电场台站受高压直流输电干扰特征和规律,从统计意义上概括典型干扰形态,包括方波、尖峰和方波+尖峰3种,其中以方波为主,占比约65.5%。通过理论推导,结合干扰实例,探讨了不同干扰形态产生的原因及影响机理,认为在近接地极区域表现为方波形态,在线路中心区域表现为尖峰形态,在二者重合区表现为方波和尖峰的组合形态。对比同一线路不同干扰事件,分析了干扰特征和台站与高压线路的相对位置、与接地极距离、影响区域地下结构等因素的关系,为识别和判定此类干扰提供了依据。A number of high voltage direct current(HVDC)transmission projects have been put into operation nationwide with the implementation of the basic strategy of“power transmission from West to East,mutual supply between South and North,and nationwide interconnection”in China,which causes increasingly prominent interference on geoelectric field observation.Thus,we summarize the characteristics and laws of interference from HVDC transmission system in geoelectric field stations throughout the country.The typical interference patterns are statistically generalized,including square wave,sharp peak and square wave+sharp peak,among which square wave is dominant,accounting for about 65.5%.In addition,the causes and influence mechanisms of different interference patterns are discussed through theoreti-cal deduction and interference examples.It is concluded that the interference pattern is square wave in the near ground electrode region,sharp peak in the line center region,and square wave+sharp peak in the overlap region.At last,by comparing different interference events of the same line,we analyze the relationships between the interference character-istics and the relative position of the station and the HVDC line,the distance from the electrode,and the underground structure of the affected area,which provides the basis for identifying and judging such interference.

关 键 词：HVDC 地电场 干扰特征 接地极 线路合成场 

分 类 号：TM721.1[电气工程—电力系统及自动化]