自并励发电机后备保护改进方案Improved Scheme of Backup Protection for Generators with Self-shunt Excitation
刘振武,魏建忠,高仕斌
摘要(Abstract):
随着电网规模的扩大,大型发电机组普遍采用自并励励磁系统,但由于短路电流衰减易造成后备保护拒动,基于理论分析,通过推导短路电流方程并计算,总结外部短路电流与外接电抗的关系即自并励发电机在不同位置发生三相和两相短路故障下的短路电流变化趋势,得出三相短路及近端两相短路时短路电流均衰减,但三相短路电流衰减会使后备保护拒动的结论,结合工程实际在现有保护基础上给出了两种分别加设低压保持元件和出口解锁的低压记忆回路的改进后备保护方案。
关键词(KeyWords): 大型发电机;自并励励磁;短路故障;故障电流特性;后备保护
基金项目(Foundation): 国家自然科学基金重点项目(U1134205)
作者(Author): 刘振武,魏建忠,高仕斌
参考文献(References):
- [1]贾宏杰,余贻鑫,韩嬴(Jia Hongjie,Yu Yixin,HanYing).发电机和并联补偿对电压小扰动稳定性的影响(Study on steady state voltage stability considering dy-namics of generator and shunt compensators)[J].电力系统自动化(Automation of Electric Power Systems),1999,23(21):12-16.
- [2]李基成.现代同步发电机整流器励磁系统[M].北京:水利电力出版社,1987.
- [3]DL/T650-1998,大型汽轮发电机自并励静止励磁系统技术条件[S].
- [4]GB/T7409-1997,同步电机励磁系统[S].
- [5]陈陈,宋依群,刘蓓(Chen Chen,Song Yiqun,Liu Bei).石洞口二厂600MW机组自并励励磁系统暂态行为分析(Dynamic performance of a static excitation system)[J].电网技术(Power System Technology),1996,20(11):37-40.
- [6]方富淇,张志坚(Fang Fuqi,Zhang Zhijian).同步发电机三相短路暂态过程的数值计算—空间矢量法(Nu-merical computation of three-phase short-circuit transientof synchronous generator using spacephasor method)[J].电力系统及其自动化学报(Proceedings of the CSU-EP-SA),1990,2(1):32-40.
- [7]余晓丹,周树棠,余国平,等(Yu Xiaodan,ZhouShutang,Yu Guoping,et al).两种实用短路计算方法分析(Discussion on two practical methods for fault currentcalculation)[J].电力系统及其自动化学报(Proceedings ofthe CSU-EPSA),2006,18(4):108-112.
- [8]王维俭,侯炳蕴.大型机组继电保护理论基础[M].2版.北京:水利电力出版社,1989.
- [9]王维俭,桂林(Wang Weijian,Gui Lin).大型发电机变压器保护技术的现状剖析和发展动向(The current statusand development trend of protection technique for large-sized generator and transformer)[J].电力设备(ElectricalEquipment),2003,4(5):15-19.
- [10]熊华强,李升健,王治(Xiong Huaqiang,Li Shengjian,Wang Zhi).由一次复压记忆过流保护误动引发的思考(Reflection of malfunction in repressing overcurrent pro-tection)[J].江西电力(Jiangxi Electric Power),2009,33(5):5-6,12.
- [11]何石鱼(He Shiyu).发电厂继电保护若干工程问题研究(Research on Several Problem of Construction of Relay ofPower Plants)[D].北京:华北电力大学电气与电子工程学院(Beijing:School of Electrical and Electronic Engi-neering of North China Electric Power University),2007.
- [12]黄家声(Huang Jiasheng).电网事故导致自并励发电机失磁保护动作分析(Analysis on grid accident led to theself-shunt generator excitation loss protection action)[J].水电厂自动化(Hydropower Plant Automation),1998,10(4):30-36.
- [13]王维俭,桂林,唐起超(Wang Weijian,Gui Lin,TangQichao).主设备后备阻抗保护反应绕组短路的灵敏度分析(Backup impedance protection sensitivity analysis forinternal winding faults of main equipment)[J].电力自动化设备(Electric Power Automation Equipment),2003,23(9):1-4.