±800 kV陕武特高压直流输电系统直流电流测量故障分析

Analysis on±800 kV Shan-Wu UHVDC System DC Current Measurement Fault

通过分析±800 kV陕武特高压直流输电(Ultra-High Voltage Direct Current,UHVDC)工程调试期间产生的直流电流测量故障,认为在满足一些特定工况下,当极母线和公共母线区域回路形成环流,高、低端阀组侧IVY、IVD最大电流较小,而直流中性母线电流IDNC较大的情况下可能导致直流测量故障报警产生。分析得知此种情况并非真正的直流测量故障,对特高压直流换流站运维具有一定指导意义。

Through the analysis±of the DC current measurement fault generated during the commissioning of the 800 kV Shaanxi Ultra-High Voltage Direct Current(UHVDC)transmission project,it is believed that under some specific working conditions,when the loop of the pole bus and the common bus area form a circulation,the maximum current of the high and low-end valve group side IVY and IVD is small,and the DC neutral bus current is larger,which may lead to a DC measurement fault alarm.The notification analysis learned that this situation is not a true DC measurement fault,which has certain guiding significance for the operation and maintenance of UHVDC converter stations.