桂中换流站直流分压器测量异常的原因分析

Reason Analysis of Abnormal Measurement for HVDC Voltage Divider in Guizhong HVDC Converter Station

分析桂中换流站直流分压器测量异常的原因。介绍了直流分压器的工作原理和直流电压控制原理,基于直流电压控制策略、暂态录波图、交直流功率测量值分析,初步判断直流分压器测量异常与电阻盒内存在虚接、远端模块箱体接地不可靠等因素有关。通过现场检查与试验,确定直流分压器测量偏高的原因是远端模块箱体接地不好或远端模块安装板接地不好。对远端模块箱体和远端模块安装板接地进行改造后,直流分压器测量恢复正常。

Reason of abnormal measurement of HVDC voltage divider in Guizhong HVDC converter station are analyzed. Working principle of HVDC voltage divider and control principle of HVDC voltage are introduced. Based on analysis of control strategy of HVDC vohage, Transient recording graph and AC/DC power measurement values, it is primarily judged that the abnormal measurement of HVDC voltage divider is related to factors including virtual connection inside the resistor box and unreliable grounding of remote module box body and so on. By field inspection and test, it is confirmed that the reason of higher measurement value of HVDC voltage divider is the bad grounding of the remote module box body or installation panel. After the modification of groundings of remote module box body and installation panel, the measurement of HVDC voltage divider returns to normal.