基于割电流的配电网选择性快速辅助保护方法
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摘要
针对配电网在单电源供电模式下只采集线路单侧信息的特点,以及集中式广域保护架构下保护智能中心采取串行处理大量信息会产生一定延时的问题,提出一种基于割电流的配电网选择性快速辅助保护新原理。该保护依托保护智能中心,利用上传的电流同步相量展开故障搜索。在一定的时间框架内保护智能中心同时收到所有节点的信息场景下,保护智能中心采用割电流差动和二分法搜索模式快速搜索故障线路。根据搜索结果对故障线路的断路器下达远方跳闸命令,并对可能发生误动的保护下达闭锁命令。理论分析和仿真结果表明,所设计的保护方案能够快速准确地判断出故障线路,且应用于不同场景时能够改善传统阶段式电流保护"四性"(可靠性、选择性、速动性和灵敏性)的不足。
According to the characteristics of single side information acquisition in a single power distribution network and the problem that there is a certain delay when intelligence center process large amounts of information by serial processing in centralized structure, a new selective fast supplementary protection of distribution network based on cutset current is proposed. The protection uses synchronous current to carry out fault searching, which relays on intelligence center. When the intelligence center receives all information simultaneously in a certain time frame, differential protection based on cutting-current and dichotomy is used to search fault line quickly. According to the results, intelligence center issues the remote tripping command to the breaker of the fault line and the blocking command to the protection of the possible malfunction. Theoretical analysis and simulation results show that the protection designed can not only determine the fault line quickly and accurately, but also improve the performance of the traditional stage type current protection to satisfy four basic requirements(reliability, selectivity, speed and sensitivity).
According to the characteristics of single side information acquisition in a single power distribution network and the problem that there is a certain delay when intelligence center process large amounts of information by serial processing in centralized structure, a new selective fast supplementary protection of distribution network based on cutset current is proposed. The protection uses synchronous current to carry out fault searching, which relays on intelligence center. When the intelligence center receives all information simultaneously in a certain time frame, differential protection based on cutting-current and dichotomy is used to search fault line quickly. According to the results, intelligence center issues the remote tripping command to the breaker of the fault line and the blocking command to the protection of the possible malfunction. Theoretical analysis and simulation results show that the protection designed can not only determine the fault line quickly and accurately, but also improve the performance of the traditional stage type current protection to satisfy four basic requirements(reliability, selectivity, speed and sensitivity).
引文
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[21]Bo Zhiqian,Wang Qingping,Zhao Yingke,et al.Anew concept intelligent integrated protection system for distribution network[C]//The 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies(DRPT),Changsha,China,2015:894-898.
[22]徐岩,应璐曼,刘泽锴.大电网下基于故障域的PMU配置和故障定位新方法[J].电网技术,2014,38(11):3199-3204.Xu Yan,Ying Luman,Liu Zekai.A new fault area based method of PMU configuration and fault location for large power grid[J].Power System Technology,2014,38(11):3199-3204.
[23]贺家李.李永丽,董新洲,等.电力系统继电保护原理[M].4版.北京:中国电力出版社,2010.
[24]郭子亮.配电网广域过电流保护研究[D].武汉:华中科技大学,2012.
[25]朱声石.高压电网继电保护原理与技术[M].3版.北京:中国电力出版社,2008.
[2]Chung J,Lu Y,Kao W,et al.Study of solving the coordination curve intersection of inverse-time overcurrent relays in subtransmission systems[J].IEEE Transactions on Power Delivery,2008,23(4):1780-1788.
[3]姜涛,李筱婧,李国庆,等.基于广域量测信息的负荷裕度灵敏度计算新方法[J].电工技术学报,2016,31(21):102-113.Jiang Tao,Li Xiaojing,Li Guoqing,et al.A novel wide-area measurement-based approach to loading margin sensitivity analysis in power systems[J].Transactions of China Electrotechnical Society,2016,31(21):102-113.
[4]何志勤,张哲,尹项根,等.基于故障电压比较的广域后备保护新算法[J].电工技术学报,2012,27(7):274-283.He Zhiqin,Zhang Zhe,Yin Xianggen,et al.A novel wide area backup protection algorithm based on fault voltage comparison[J].Transactions of China Electrotechnical Society,2012,27(7):274-283.
[5]汪旸,尹项根,张哲,等.基于遗传信息融合技术的广域继电保护[J].电工技术学报,2010,25(8):174-179.Wang Yang,Yin Xianggen,Zhang Zhe,et al.Wide area protection based on genetic information fusion technology[J].Transactions of China Electrotechnical Society,2010,25(8):174-179.
[6]李俊刚,张爱民,张杭,等.广域保护系统数据网络可靠性评估[J].电工技术学报,2015,30(12):344-350.Li Jungang,Zhang Aimin,Zhang Hang,et al.Reliability evaluation of the wide area protect system[J].Transactions of China Electrotechnical Society,2015,30(12):344-350.
[7]刘子文,冉晓洪,苗世洪.基于广域测量系统的交直流系统Markov切换控制器设计[J].电工技术学报,2017,32(10):241-251.Liu Ziwen,Ran Xiaohong,Miao Shihong.Design of Markov switching controller of AC-DC power system based on wide area measurement system[J].Transactions of China Electrotechnical Society,2017,32(10):241-251.
[8]马燕峰,张佳怡,蒋云涛,等.计及广域信号多时滞影响的电力系统附加鲁棒阻尼控制[J].电工技术学报,2017,32(6):58-66.Ma Yanfeng,Zhang Jiayi,Jiang Yuntao,et al.Additional robust damping control of wide-area power system with multiple time delays considered[J].Transactions of China Electrotechnical Society,2017,32(1):1-11.
[9]梁睿,徐成,王飞,等.复杂输电网中基于全网行波信息的测距装置最优配置[J].电工技术学报,2016,31(21):30-38.Liang Rui,Xu Cheng,Wang Fei,et al.Optimal deployment of fault location devices based on wide area travelling wave information in complex power grid[J].Transactions of China Electrotechnical Society,2016,31(21):30-38.
[10]刘育权,华煌圣,李力,等.多层次的广域保护控制体系架构研究与实践[J].电力系统保护与控制,2015,43(5):112-122.Liu Yuquan,Hua Huangsheng,Li Li,et al.Research and application of multi-level wide-area protection system[J].Power System Protection and Control,2015,43(5):112-122.
[11]李振兴,尹项根,张哲,等.分区域广域继电保护的系统结构与故障识别[J].中国电机工程学报,2011,31(28):95-103.Li Zhenxing,Yin Xianggen,Zhang Zhe,et al.Study on system architecture and fault identification of zone-division wide area protection[J].Proceedings of the CSEE,2011,31(28):95-103.
[12]姜涛,贾宏杰,李国庆,等.基于广域量测信息相关性的电力系统同调辨识[J].电工技术学报,2017,32(1):1-11.Jiang Tao,Jia Hongjie,Li Guoqing,et al.Crosscorrelation coefficient-based coherency identification in bulk power system using wide-area measurements[J].Transactions of China Electrotechnical Society,2017,32(1):1-11.
[13]李振兴,尹项根,张哲,等.基于多Agent的广域保护系统体系研究[J].电力系统保护与控制,2012,40(4):71-75.Li Zhenxing,Yin Xianggen,Zhang Zhe,et al.Hierarchy of wide area protection system based on multi-Agent[J].Power System Protection and Control,2012,40(4):71-75.
[14]Kamwa I,Pradhan A K,Joos G.Adaptive phasor and frequency-tracking schemes for wide-area protection and control[J].IEEE Transactions on Power Delivery,2011,26(2):744-753.
[15]Eissa M M,Masoud M E,Elanwar M M M.A novel backup wide area protection technique for power transmission grids using phasor measurement unit[J].IEEE Transactions on Power Delivery,2010,25(1):270-278.
[16]Serizawa Y,Myoujin M,Kitamura K,et al.Widearea current differential backup protection employing broadband communications and time transfer systems[J].IEEE Transactions on Power Delivery,1998,13(4):1046-1052.
[17]王廷凰,黄福全,时伯年.城市配电网广域控制保护技术应用研究[J].南方电网技术,2014,8(4):112-115.Wang Tinghuang,Huang Fuquan,Shi Bonian.Research on wide area control and protection technique for urban distribution network[J].Southern Power System Technology,2014,8(4):112-115.
[18]张兆云,陈卫,张哲,等.一种广域差动保护实现方法[J].电工技术学报,2014,29(2):297-303.Zhang Zhaoyun,Chen Wei,Zhang Zhe,et al.Amethod of wide-area differential protection[J].Transactions of China Electrotechnical Society,2014,29(2):297-303.
[19]徐丙垠,薛永端,李天友,等.智能配电网广域测控系统及其保护控制应用技术[J].电力系统自动化,2012,36(18):2-9.Xu Bingyin,Xue Yongrui,Li Tianyou,et al.A wide area measurement and control system for smart distribution grids and its protection and control application[J].Automation of Electric Power Systems,2012,36(18):2-9.
[20]刘凯,李幼仪.主动配电网保护方案的研究[J].中国电机工程学报,2014,34(16):2584-2590.Liu Kai,Li Youyi.Study on solutions for active distribution grid protection[J].Proceedings of the CSEE,2014,34(16):2584-2590.
[21]Bo Zhiqian,Wang Qingping,Zhao Yingke,et al.Anew concept intelligent integrated protection system for distribution network[C]//The 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies(DRPT),Changsha,China,2015:894-898.
[22]徐岩,应璐曼,刘泽锴.大电网下基于故障域的PMU配置和故障定位新方法[J].电网技术,2014,38(11):3199-3204.Xu Yan,Ying Luman,Liu Zekai.A new fault area based method of PMU configuration and fault location for large power grid[J].Power System Technology,2014,38(11):3199-3204.
[23]贺家李.李永丽,董新洲,等.电力系统继电保护原理[M].4版.北京:中国电力出版社,2010.
[24]郭子亮.配电网广域过电流保护研究[D].武汉:华中科技大学,2012.
[25]朱声石.高压电网继电保护原理与技术[M].3版.北京:中国电力出版社,2008.