摘要
目前国内不同区域的几台660 MW机组陆续发生发电机程跳逆功率保护拒动事故。通过对保护装置的动作逻辑及计算原理进行分析,结合现场运行的实际情况对拒动装置进行校验,发现保护装置在功率平面上的实际动作曲线与理想动作曲线有较大偏差。根据逆功率保护算法原理分析该偏差来自功率因数角的采样误差,由此面向装置生产厂家给出了功率因数角的优化计算方法。同时针对采用程跳逆功率保护的用户提出了在无功水平很低时进行打闸操作的最优运行策略。
At present, several sets of 660 MW units in different regions in China have occurred remsmg trip lanur~ ui generator process-control reverse power protection in succession. Through the analysis of the action logic and calculation principle of the protection device, under the actual situation of the on-site operation of the system, the device which refused to trip is checked, finding out that the actual operating curve of the protection device in the power plane is greatly deviated from the ideal action curve. According to the principle of reverse power protection algorithm, the deviation is derived from the sampling error of the power factor angle. Therefore, the optimal calculation method of the power factor angle is given from the device manufacturer. And present, an optimal operating strategy for manual trip is proposed for the users who adopt process-control inverse power protection when the reactive power level is very low.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2017年第21期152-156,共5页
Power System Protection and Control
基金
秦岭发电厂科技协会基金资助
关键词
发电机
程跳逆功率保护
拒动
功率因数角
generator
process-control reverse power protection
refusing trip
power factor angle
