基于PSCAD配电网合环电流仿真与分析
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摘要
合环冲击电流是引起继电保护误动作的重要原因之一,针对配电网合环操作时产生的合环电流研究其影响因素对减小合环线路的冲击与提高电网供电可靠性的意义重大。经过对配网合环电流建模,分析合环电流与合环点电压差、环网总阻抗的关系,可知当选择合环点两端电压向量差较小和两端负荷大小接近的线路时,合环线路冲击最小,有利于提高合环成功率。通过对三种典型合环模式下10kV优路径的正确性和有效性,为配电网的安全稳定运行提供了可靠的合环操作依据。
Loop-closing surge current is one of the important reasons for relay protection misoperation. It is of great significance to study the influencing factors of the closed loop current generated during the closed-loop operation of the distribution network for reducing assault of the loop circuit and improving the reliability of the power supply system. By modeling loop current and analyzing the relationship between the loop current and the voltage difference at the closing point and total impedance,it is found that when selecting a circuit with a small voltage difference and a close load at both ends,the assault of circuit is minimal and it is beneficial to improving the success rate of the closed loop. Finally,a equivalent loop model based on PSCAD of distribution network for 10kV feeders in three modes of a certain area is established. It verifies the correctness and effectiveness of the optimal path and provides reliable manipulation basis for safe and stable operation of distribution network.
Loop-closing surge current is one of the important reasons for relay protection misoperation. It is of great significance to study the influencing factors of the closed loop current generated during the closed-loop operation of the distribution network for reducing assault of the loop circuit and improving the reliability of the power supply system. By modeling loop current and analyzing the relationship between the loop current and the voltage difference at the closing point and total impedance,it is found that when selecting a circuit with a small voltage difference and a close load at both ends,the assault of circuit is minimal and it is beneficial to improving the success rate of the closed loop. Finally,a equivalent loop model based on PSCAD of distribution network for 10kV feeders in three modes of a certain area is established. It verifies the correctness and effectiveness of the optimal path and provides reliable manipulation basis for safe and stable operation of distribution network.
引文
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[2]朱雨晨,赵冬梅,刘世良,等.基于机电暂态-电磁暂态混合仿真的电网合环分析计算系统[J].电力系统保护与控制,2012,40(23):73-79.ZHU Yuchen,ZHAO Dongmei,LIU Shiliang,et al.Loop closing analytical calculation system based on electromagnetic-electromechanical transient simulation for power network[J].Power System Protection and Control,2012,40(23):73-79.
[3]苗培青,于耿曦,纪双全,等.不同量测数据情形的配电网合环操作计算及应用[J].电力系统保护与控制,2015,43(01):137-144.MIAO Peiqing,YU Gengxi,JI Shuangquan,et al.Calculation and application of distribution network closing loop operation in different situation of measurement data[J].Power System Protection and Control,2015,43(01):137-144.
[4]李晓柯,李祥发.配电网合环冲击电流的暂态过程分析与仿真[J].机电工程,2010,27(5):67-70.LI Xiaoke,LI Xiangfa.Transient Analysis and Simulation of Surge Current due to Closing Loop in Distribution Network[J].Journal of Mechanical&Electrical Engineering,2010,27(5):67-70.
[5]段若晨,姚蓉,郑可,等.同分区配电网10kV侧合环冲击电流分析[J].电力与能源,2017,38(05):507-510.DUAN Ruochen,YAO Rong,ZHENG Ke,et al.Analysis of 10 kV Side Loop-Closing Surge Current in Distribution Networks of the Same Partition[J].Power and energy.2017,38(05):507-510.
[6]甘国晓,王主丁,李瑞,等.配电网合环冲击电流计算方法及其简化计算公式[J].电力系统自动化,2014,38(20):115-120.GAN Guoxiao,WANG Zhuding,LI Rui,et al.Methods and Simplified Formulas for Calculating Surge Currents from Loop Closing in Distribution Networks[J].Automation of Electric Power Systems,2014,38(20):115-120.
[7]张宇星,仇斐,弭辙.配电网合环操作分析与决策软件开发[J].山西电力,2008,12(6):13-16.ZHANG Yuxing,QIU Fei,MI Zhe.Discussion on Loop Closing Operation in Distribution Network and Development of Decision Software[J].Shanxi Electric Power,2008,12(6):13-16.
[8]甘国晓.配电网合环可行性研究[D].重庆:重庆大学,2015.GAN Guoxiao.Feasibility Study on Closed-Loop in Distribution Networks[D].Chongqing:Chongqing University,2015.
[9]肖白,赵龙安,张宇,等.城市中压配电网合环操作分析与决策[J].电力系统保护与控制,2014,42(16):133-138.XIAO Bai,ZHAO Longan,ZHANG Yu,et al.Analysis and decision of loop closing operation in urban mid-voltage distribution network[J].Power System Protection and Control,2014,42(16):133-138.
[10]汲亚飞,赵江河.辐射型配电网合环稳态电流计算方法研究[J].电力系统保护与控制,2009,37(12):15-19.JI Yafei,ZHAO Jianghe.Calculation of the loop closing steady-state current in radial power distribution nework[J].Power System Protection and Control,2009,37(12):15-19.
[11]葛少云,李晓明.基于戴维南等值的配电网合环冲击电流计算[J].电力系统及其自动化学报,2007,19(6):124-127.GE Shaoyun,LI Xiaoming.Study on surge current due to closing loop in distribution network based on thevenin's equivalent[J].Proceedings of the CSU-EPSA,2007,19(6):124-127.
[12]姜瀚书,孙翀也,贾彦兵,等.10kV配电网合环电流暂态过程的分析与仿真[J].黑龙江电力,2011,33(02):88-90.JIANU Hanshu,SUN Chongye,JIA Yanbing,et al.Transient Analysis and Simulation of Surge Current due to Closing Loop in 10kV Distribution Network[J].Heilongjiang Electric Power.2011,33(2):88-90.
[13]龙娓莉.配电网合环操作的研究及决策软件的开发[D].北京:华北电力大学,2006.LONG Weili.The research on loop closing operation in distribution network and the development of decision software[D].Beijing:North China Electric Power University,2006.
[14]叶清华,唐国庆,王磊,等.配电网合环操作环流分析系统的开发和应用[J].电力系统自动化,2002,26(22):66-69.YE Qinghua,TANG Guoqing,WANG Lei,et al.Development and application of the analysis system for closed loop operation of distribution network[J].Electric Power Automation Equipment,2002,26(22):66-69.
[15]李江华.浅析10kV配网合环产生环流的原因及预防措施[J].电网技术,2006,30(增刊):199-201.LI Jianghua.Simple analysis of the reason and protective step of 10kV distribution network causing circumfluence[J].Power System Technology,2006,30(S):199-201.