摘要
分析了带直流线路开路试验时,换流器的触发角变化对开路电压、充电电流以及阀电压的影响,得出的结论是:在直流线路未发生绝缘贯穿性损坏的条件下,当触发角小于60°时,还可以将直流电压升到额定值;开路试验充电电流在触发角小于60°时约为常数,主要与直流线路的结构参数及电晕放电大小有关;触发角越小,阀电压畸变越小。该观点已为三峡-广东直流工程的调试人员所接受,在广东省惠州市鹅城换流站进行的开路试验中,将换流器触发角降为35.7°时,开路电压升到了额定值500kV。
The influences of the variation of firing angle of the converter on open line voltage, energization current and valve voltage are researched under the condition of open line test (OLT) with DC line, and the obtained conclusions are as follows: when the firing angle of the converter is reduced to less than 60°, the DC voltage can be still risen to its rated value; the energization current under the OLT will be constant while the firing angle of the converter is less than 60° and this current mainly depends on the structural parameters of DC transmission line and the intensity of the corona discharge; the lower the firing angle of the converter is, the smaller the voltage aberrance of valve arm will be. The personnel who engaged in the commissioning test of Three Gorges to Guangzhou HVDC project approve these conclusions. In the OLT carried out at a certain converter station, when the firing angle of the converter is reduced to 35.7°, the open line voltage can be risen to rated value 500kV.
出处
《电网技术》
EI
CSCD
北大核心
2004年第22期11-14,25,共5页
Power System Technology
