ANALYSIS OF INTERFERENCE CAUSED BY HVDC TRANSIMISSION TO THE Z COMPONENT OF GEOMAGNETIC OBSERVATIONS AT YANCHEN SSISMIC STATION
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 transmis-sion interference events from 2021 to 2023,and finds that Yancheng seismic monitoring station is mainly affect-ed 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.
Geomagnetic observationHigh-voltage direct current transmissionZ-componentInterfer-encePre-processing
NETL
NSTL
万方数据
