摘要
针对现有高压直流输电系统开路电压公式不适用于计算带直流线路开路试验开路电压的问题,分别对带/不带直流线路开路试验的试验原理及开路电压建立过程进行分析,解释了带直流线路开路试验中开路电压较小的原因,并通过对现有开路电压计算公式进行修正,给出了适用于带直流线路开路试验的开路电压计算公式。所提公式可用以修正直流开路试验电压差值保护整定值,避免了带线路开路试验中电压差值保护的误动。利用PSCAD仿真软件搭建±500 k V高压直流输电系统仿真模型,对所提公式进行了仿真验证。仿真结果证明所提公式具有较高的准确性。
The existing open line voltage calculation of OLT （Open voltage formula of HVDC system is not applicable to the open line Line Test） with DC line,for which,the test principle and the set-up process of open line vohage are analyzed respectively for OLT with and without DC line and the reason why the open line voltage of OLT with DC line is smaller is explained. An improved open line voltage formula is given for the OLT with DC line,which is used to correct the setting of OLT voltage differential protection to avoid its misoperation. The simulation model of typical ±500 kV HVDC transmission system is built with PSCAD and the simulative results show the higher accuracy of the improved formula.
出处
《电力自动化设备》
EI
CSCD
北大核心
2015年第11期95-102,共8页
Electric Power Automation Equipment
关键词
高压直流输电
高压直流输电开路试验
开路电压
触发角
直流线路参数
滤波器
仿真
模型
HVDC power transmission
HVDC open line test
open line voltage
firing angle
DC line parameters
electric filters
computer simulation
models
