直流输电无接地极运行方式下减少入地电流的研究

Research on Ground Current Reduction under Operation Mode of No-grounding Electrode in Pu' er-Qiaoxiang DC Transmission Project

根据无接地极特殊运行方式的特点,对直流的控制保护做相应的改造,进行双极解锁同步启动顺序、双极电流同步逻辑及双极联跳功能的优化,减少站内接地网的入地电流。通过实际的调试,验证了对控制保护做出的相应改造从而减少入地电流的可行性。

According to the characteristics of a very special way of operating without earth electrode, we need to change the control and protection software of DC Transmission Project, and optimize the synchronization of bipolar deblocked sequence, bipolar current synchronous logic and bipolar tripping function, to reduce current that flow into the station grounding grid. Through practical debugging, we prove the feasibility of change the control and protection software of DC Transmission Project to reduce the current into the station grounding grid.