短路电流直流分量实用计算方法研究
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摘要
短路电流直流分量含量对断路器开断能力有很大影响,然而对直流分量的计算至今缺乏简单实用的方法。分析短路电流直流分量产生原理及其衰减特性,结合电力网络数学模型的特点,提出了基于转移阻抗理论的短路电流直流分量实用计算方法:将电力系统复杂网络近似简化为以短路点为中心的辐射形网络,求出各发电机所提供短路电流直流分量及其衰减情况,最终对所有分支短路电流直流分量求和近似计算出故障点短路电流直流分量。通过实用计算方案与EMTP仿真计算以及故障录波的对比分析,验证了该方法的准确性。
DC component of short circuit current has a great influence on the breaking capacity of the circuit breaker. However,its calculation is still lack of a simple and practical method. Based on the analysis of the principle and attenuation characteristics of the DC component of short circuit current and the characteristics of the mathematical model of power network,a practical method for calculating the DC component of short circuit current is proposed.The complex network of power system is simplified into a radial network with short circuit point as the center,and then the DC component of each generator branch is calculated,finally,the DC component of short circuit current at fault point is approximately calculated by summing the DC component of all branch short circuit currents. The accuracy of the method is verified by the comparison between practical calculation and EMTP simulation.
DC component of short circuit current has a great influence on the breaking capacity of the circuit breaker. However,its calculation is still lack of a simple and practical method. Based on the analysis of the principle and attenuation characteristics of the DC component of short circuit current and the characteristics of the mathematical model of power network,a practical method for calculating the DC component of short circuit current is proposed.The complex network of power system is simplified into a radial network with short circuit point as the center,and then the DC component of each generator branch is calculated,finally,the DC component of short circuit current at fault point is approximately calculated by summing the DC component of all branch short circuit currents. The accuracy of the method is verified by the comparison between practical calculation and EMTP simulation.
引文
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[17]宋小翠,刘志刚,王英.基于ATP-EMTP的计及高架桥高速铁路过分相电磁暂态研究[J].电力系统保护与控制,2016,44(13):6-13.SONG Xiaocui,LIU Zhigang,WANG Ying.Study on electromagnetic transient process in split-phase insulator considering viaduct’s electrical coupling based on ATP-EMTP[J].Power System Protection and Control,2016,44(13):6-13.
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[2]杨杉,同向前,刘健,等.含分布式电源配电网的短路电流计算方法研究[J].电网技术,2015,39(7):1977-1982.YANG Shan,TONG Xiangqian,LIU Jian,et al.short-circuit current calculation of distribution network with distributed generation[J].Power System Technology,2015,39(7):1977-1982.
[3]潘晓杰,张顺,文汀,等.渝鄂异步互联对华中电网运行特性的影响[J].电力系统保护与控制,2016,44(19):157-162.PAN Xiaojie,ZHANG Shun,WEN Ting,et al.Operation characteristic analysis of central China power grid in unsynchronized interconnection of Chongqing and Hubei power grid power[J].System Protection and Control,2016,44(19):157-162.
[4]丁少倩,林涛,翟学,等.基于短路容量的含大规模新能源接入的电网状态脆弱性评估方法研究[J].电力系统保护与控制,2016,44(13):40-47.DING Shaoqian,LIN Tao,ZHAI Xue,et al.Research on state vulnerability assessment method of grid with large scale new energy sources based on short-circuit capability[J].Power System Protection and Control,2016,44(13):40-47.
[5]郑少鹏,钟显,孙谊媊,等.±1 100 kV特高压直流接入后短路电流分析及限制措施研究[J].高压电器,2016,52(11):18-24.ZHENG Shaopeng,ZHONG Xian,SUN Yiqian,et al.Research of short-circuit current analysis and its limiting measures after±1 100 kV UHV DC connected to grid[J].High Voltage Apparatus,2016,52(11):18-24.
[6]周明,曹炜,陈文涛,等.串联电抗器对电力系统短路电流特性影响的研究[J].电力系统保护与控制,2017,45(11):1-6.ZHOU Ming,CAO Wei,CHEN Wentao,et al.Study on influence of series reactor on power system short-circuit current characteristics[J].System Protection and Control,2017,45(11):1-6.
[7]蒋霖,王枫,李泰军,等.三峡近区电网短路电流限制措施研究[J].陕西电力,2015,43(12):48-51.JIANG Lin,WANG Feng,LI Taijun,et al.Research on measures of limiting short-circuit current in power grid near Three Gorges[J].Shaanxi Electric Power,2015,43(12):48-51.
[8]贾申利,史宗谦,王立军.真空断路器用于直流开断研究综述[J].高压电器,2017,53(3):12-16.JIA Shenli,SHI Zongqian,WANG Lijun.Review on the research of vacuum circuit breaker for DC breaking[J].High Voltage Apparatus,2017,53(3):12-16.
[9]刘小浩,刘旭,李健,等.直流分量时间常数对断路器非对称开断性能影响分析[J].电工电气,2016(8):47-50.LIU Xiaohao,LIU Xu,LI Jian,et al.Analysis of direct current component time constant influence onAsymmetrical breaking ability of circuit breakers[J].Electrotechnics Electric,2016(8):47-50.
[10]邹家勇,余波,包维瀚,等.特高压变电站短路电流直流分量对接地网设计的影响[J].高电压技术,2017,43(5):1621-1627.ZOU Jiayong,YU Bo,BAO Weihan,et al.Influence of the DC component of short circuit current on grounding grid design of UHV substation[J].High Voltage Engineering,2017,43(5):1621-1627.
[11]三相交流系统短路电流计算标准:GB/T 15544.1-2013[S].北京:中国标准出版社,2013.Short-circuit current calculation in three-phase A.C.systems:GB/T 15544.1-2013[S].Beijing:China Standard Press,2013.
[12]水利电力西北电力设计院.电力工程电气设计手册:电气一次部分[M].北京:中国电力出版社,1989:140.North West Electric Power Design Institute of Water Conservancy and Electric Power.Electric engineering design manual:Electric primary part[M].Beijing:China Electric Power Press,1989:140.
[13]水电工程三相交流系统短路电流计算:NB/T 35043-2014[S].北京:中国电力出版社,2014.Guide for short-circuit current calculation in three-phase AC systems of hydropower projects:NB/T 35043-2014[S].Beijing:China Electric Power Press,2014.
[14]西安交通大学,西北电力设计院,西北勘测设计院.短路电流实用计算方法[M].北京:电力工业出版社,1982.Xi’an Jiaotong University,Northwest Electric Power Design Institute,Northwest Investigation Design and Research Institute.Practical calculation method of short-circuit current[M].Beijing:Electric Power Industry Press,1982.
[15]曹炜,王永生,张文青,等.电力系统短路电流直流分量及其对断路器开断能力的影响[J].电网技术,2012,36(3):283-288.CAO Wei,WANG Yongsheng,ZHANG Wenqing,et al.Analysis on DC component in short-circuit current of power grid and its influence on breaking ability of circuit breakers[J].Power System Technology,2012,36(3):283-288.
[16]王典浪,李东,杨晓维,等.500 kV罗平站主变加装中性点限流电抗器电磁暂态研究及设备选型[J].高压电器,2017,53(5):170-174.WANG Dianlang,LI Dong,YANG Xiaowei,et al.Electromagnetic transient study and equipment selection of neutral current-limiting reactor installation for main transformer in500 kV luoping substation[J].High Voltage Apparatus,2017,53(5):170-174.
[17]宋小翠,刘志刚,王英.基于ATP-EMTP的计及高架桥高速铁路过分相电磁暂态研究[J].电力系统保护与控制,2016,44(13):6-13.SONG Xiaocui,LIU Zhigang,WANG Ying.Study on electromagnetic transient process in split-phase insulator considering viaduct’s electrical coupling based on ATP-EMTP[J].Power System Protection and Control,2016,44(13):6-13.
[18]靳希,张文青,刘蓓,等.基于ATP-EMTP的上海电网短路电流直流分量衰减特性分析[J].华东电力,2010,38(10):1554-1557.JIN Xi,ZHANG Wenqing,LIU Bei,et al.Analysis of decaying characteristics of DC component of short circuit current Shanghai grid based on ATP-EMTP[J].East China Electric Power,2010,38(10):1554-1557.
[19]Short-circuit currents in three-phase A.C.systems-calculation of currents:IEC 60909-0:2016[S].Geneva,Switzerlandiec:IEC Central Office,2016.
[20]何仰赞,温增银.电力系统分析-上册[M].武汉:华中工学院出版社,1984.HE Angzan,WEN Zengyin.Power system analysis-volume 1[M].Wuhan:Huazhong Institute of Technology Press,1984.