摘要
为解决大组交流滤波器连线差动保护动作引起直流极闭锁而导致直流传输功率降低的问题,结合一起大组滤波器连线差动保护动作情况以及交流站控制系统最后断路器逻辑,对大组交流滤波器连线差动保护动作引起直流极闭锁的原因进行分析,阐明大组交流滤波器保护装置采样通道故障是差动保护误动的原因,指出交流站控制系统点位配置错误是引起直流极闭锁的原因,为此,提出改用采集换流变进线电压和换流变进线避雷器的泄漏电流来评估换流器最后断路器已断开以及最后优化交流场最后断路器判断逻辑等优化措施,可大大改善直流输电的可靠性。
In order to solve the problem of reduction of DC transmission power caused by DC bipolar blocking due to connec- tion differential protection of AC filters （ACF）, this paper analyzes reasons by combining one case of ACF connection dif- ferential protection and the last breaker logic of AC station control system. It states the reason for differential protection malfunction is fault of sampling channel of the ACF protection device and points out the reason for DC bipolar blocking is wrong configuration of AC station control point. Therefore, it proposes optimizing suggestions to improve reliability of DC power transmission such as using converter transformer primary voltage and leakage current of inlet arrestor of the converter transformer to evaluate break state of the last breaker, optimizing judging logic of the last breaker, and so on.
出处
《广东电力》
2017年第1期121-125,共5页
Guangdong Electric Power
关键词
交流滤波器
连线差动
最后断路器
交流站控
直流极闭锁
AC filter
connection differential protection
last breaker
AC station control
DC bipolar blocking
