摘要
现有调相机失磁保护采用阶梯型特性曲线,存在死区,且在高系统电压工况下发生部分失磁故障时可能拒动。文章提出了一种基于进相速率的调相机失磁保护。利用定子内电势及励磁电压构造了定子侧平面及转子侧平面,提出了基于双曲线函数的特性曲线以避免产生死区。提出了进相速率检测器,以区分高系统电压工况下的部分失磁故障与正常调节。另外,还引入了闭锁判据以防止系统电压突增导致进相速率检测器误动。调相机失磁保护新原理极大地提高了保护的可靠性和灵敏性。最后,通过PSCAD仿真结果验证了现有保护的不足及保护新原理的优越性能。
With the staircase characteristic curve adopted,the current field loss protection has its dead zone and may rejects to operate when partial loss of field occurs under a high system voltage condition.A new field loss protection for synchronous condenser based on advancing velocity is proposed in this paper.By using the stator and rotor characteristic planes constructed respectively with the stator potential and the field voltage,the hyperbolic characteristic curve is proposed and the protection dead zone is eliminated.The advancing level criterion is proposed to distinguish the partial loss of field and the high system voltage regulation.In addition,the blocking criterion is put forward to avoid advancing level criterion mal-operation when sudden increase of system voltage occurs.The new field loss protection has higher reliability and sensitivity.The PSCAD simulation results verify the shortcoming of the current protection and the superior performance of the new protection.
作者
曹虹
周泽昕
柳焕章
张志
戴飞扬
王兴国
杜丁香
CAO Hong;ZHOU Zexin;LIU Huanzhang;ZHANG Zhi;DAI Feiyang;WANG Xingguo;DU Dingxiang(State Key Laboratory for Security and Energy Saving(China Electric Power Research Institute),Haidian District,Beijing 100192,China;Central China Branch of State Grid Corporation of China,Wuhan 430077,Hubei Province,China;State Grid Corporation of China,Xicheng District,Beijing 100031,China)
出处
《电网技术》
EI
CSCD
北大核心
2020年第10期4011-4019,共9页
Power System Technology
基金
国家电网有限公司科技项目“多类型电力设备故障识别及保护技术研究”。
关键词
调相机
失磁保护
进相速率检测器
闭锁判据
synchronous condenser
field loss protection
advancing level criterion
blocking criterion
