一种孤岛运行方式下普洱换流站直流站控跳闸回路的改进方法

An Improved Method for DC Station Control Tripping Circuit in Pu'er Converter under Islanded Operation

依据糯扎渡电站送电广东直流输电工程设计规范:如果该工程处于孤岛运行方式下双极闭锁时,普洱换流站直流站控需通过硬接线开出跳闸接点连接至各大组交流滤波器母线保护屏,通过中间继电器将所有交流滤波器断路器跳开。但这样也同时跳开了站内两台500k V站用变压器,存在全站失电的风险。本文根据普洱换流站主接线、直流站控、交流滤波器母线保护及断路器相关参数,提出一种跳闸回路改进方法,确保双极闭锁时既能快速的分开所有交流滤波器,又不影响站内2台500k V站用变压器的正常运行。

According to the design specifications of Nuozhadu-Guangdong DC transmission project ： if bipole ESOF happens when this transmission project is under islanded operation,DC station control in Pu＇er convertor station should send trip order to each AC filter bus protection by cables,and then trip all AC filters through intermediate relays. Meanwhile,it will also trip the two 500 kV transformer stations,which will lead to the risk of power loss in the whole station. An improved method of tripping circuit is proposed based on main electrical scheme of Pu ＇er convertor station,DC station control,AC filter bus protection and some related parameters of circuit breaker,it can trip all AC filter quickly without influencing the normal operation of the two 500 kV transformer stations when bipole ESOF happens.