摘要
为减小直流输电线路对地磁场观测的干扰,采用数学计算的方法精确求解了线路对地磁Z分量的干扰水平。以观测点为原点建立了地磁仪器观测点坐标系,推导了观测点坐标系各坐标轴在地心坐标系中的单位矢量表达式。根据空间矢量点积的定义,得到了空间电流磁场矢量投影到地磁Z分量方向的求解公式。利用推导的公式和直流线路电流磁场三维计算模型,最终求得直流线路对地磁Z分量观测的干扰水平。由此,开发了＂直流线路对地磁观测干扰校正系统＂,并开展了地磁台站和野外联合地磁观测干扰实验。结果表明,直流线路和地磁观测台站距离不超过10km时,提出的数学模型和计算方法误差不超过5%。
China is located in an earthquake-prone area. The seismic stations throughout China observe the changes in the earth＇s electromagnetic field. The magnetic filed from DC power lines at normal operation states and geomagnetic field are not easily distinguished. However, if the current on a power line is changed, the operation of the power line is switched between ambipolar and unipolar, otherwise normal operation will fail, and the DC magnetic field along the power line will be changed around nearly 10,000 square kilometers. In the current construction of UHVDC projects, how to avoid the disturbance on seismic stations or geomagnetic observation stations caused by DC power lines has became the universal problem of route selection in power line design.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2012年第30期I0021-I0021,23,共1页
Proceedings of the CSEE
基金
国家电网公司科学技术项目（SG0925,SG11008）
关键词
干扰修正
电源线
地磁场
观测站
高压直流输电工程
DC
Z分量
地震台站
DC power line
Z component of geomagnetic field
correction of interference
vector projection
geomagneticobservation experiment
interference correction system
