高压直流输电对盐城地震监测站地磁观测Z分量干扰分析  

ANALYSIS OF INTERFERENCE CAUSED BY HVDC TRANSIMISSION TO THE Z COMPONENT OF GEOMAGNETIC OBSERVATIONS AT YANCHEN SSISMIC STATION

作　　者：郭灏明 王斌 梁雪萍 严超 GUO Haoming;WANG Bin;LIANG Xueping;YAN Chao(Yancheng General Seismic Station of Nantong Center Seismic Station,Yancheng 224005,China;Nantong Center Seismic Station of Jiangsu Province,Nantong 226001,China)

机构地区：[1]南通地震监测中心站盐城一般站,江苏盐城224005 [2]江苏省南通地震监测中心站,江苏南通226001

出　　处：《高原地震》2024年第3期36-43,共8页Plateau Earthquake Research

摘　　要：随着我国经济发展和能源合理配置的需要,越来越多的高压直流输电线路投入建设和运行。当高压直流输电线路中出现不平衡电流时,沿线地震台站的地磁观测在不同程度上受到干扰,其中Z分量受干扰程度最为显著。为确保地磁观测数据的真实性、连续性及可靠性,为其他地震地磁观测台站高压直流输电干扰识别及预处理提供参考,本文以盐城地震监测站为例,汇总分析了2021—2023年高压直流输电干扰事件,发现盐城地震监测站主要受11条高压直流输电线路影响,地磁观测Z分量受高压直流输电干扰的影响形态主要表现为方波和缓变,可采用去除台阶法和缓变处理。通过对盐城地震监测站和高邮地震监测站受干扰的Z分量干扰幅度拟合分析,给出两台站受不同高压直流输电线路干扰的幅度比值,有利于台站监测人员利用这一特征进行数据处理校验。同时可利用干扰台阶计算、差值校验及多台对比等方式对预处理进行校验,以提高数据处理的效率及准确率。With the needs of China's economic development and rational allocation of energy,more and more high-voltage DC transmission lines are put into construction and operation.When the unbalanced current occurs in the HVDC transmission lines,the geomagnetic observation of the seismic stations along the line is affected by the interference in different degrees,among which the Z-component is disturbed to the most significant degree.In order to ensure the authenticity,continuity and reliability of the geomagnetic observation data,and to provide reference for the identification and pre-processing of high-voltage DC transmission interference in other seismic geomagnetic observation stations,this paper takes Yancheng seismic monitoring station as an example.Taking Yancheng seismic monitoring station as an example,this paper summarises and analyses the HVDC transmission interference events from 2021 to 2023,and finds that Yancheng seismic monitoring station is mainly affected by 11 HVDC transmission lines,and that the Z-component of the geomagnetic observation is mainly affected by the HVDC transmission interference in the form of square wave and slow change,which can be processed by removing the step method and slow change.Through the fitting analysis of the interference amplitude of the Z-component of Yancheng seismic monitoring station and Gaoyou seismic monitoring station,the amplitude ratios of the two stations affected by the interference of different high-voltage DC transmission lines are given,which is conducive to the use of this feature by the station staff to carry out the data processing and calibration.At the same time,the pre-processing can be calibrated by using the interference step calculation,difference calibration and multi-stations comparison to improve the efficiency and accuracy of data processing.

关 键 词：地磁观测 高压直流输电 Z分量 干扰 预处理 

分 类 号：P315.63[天文地球—地震学] P315.721[天文地球—固体地球物理学] P315.73[天文地球—地球物理学]