基于相量集合的站域差动保护研究
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摘要
针对智能变电站发展现状,分析了站域信息共享情况下,采样信息失步对差动保护的影响。在此基础上提出了基于相量集合的站域差动保护算法。该算法采用各支路的电流同步相量参引进行差动保护逻辑计算,依此计算出差动电流和制动电流,解决了由于采样信息失步导致的保护误动或拒动。最后,仿真结果表明,基于相量集合的差动保护算法在SV一定程度的失步情况下,差动保护的灵敏性和可靠性不受影响,能够保证站域差动保护可靠实施。因此,可以在新一代智能变电站站域保护装置上加以采用。
Based on the intelligent substation development, this paper analyzes the influence of unsynchronized sampling value(SV) on differential protection under the circumstance of substation information sharing, based on which a substation differential protection algorithm based on phase set is proposed. The algorithm uses the current synchronous phasor reference citation of each branch for differential protection logic calculation, and the calculated differential current and braking current can solve protection malfunction or refuse caused by the unsynchronized SV. Finally, the simulation results show that using the differential protection algorithm based on phase set, the sensitivity and reliability are not affected under a certain extent unsynchronized SV, which ensures reliable implementation of substation differential protection. Therefore, this differential protection algorithm can be used in the new generation intelligent substation.
Based on the intelligent substation development, this paper analyzes the influence of unsynchronized sampling value(SV) on differential protection under the circumstance of substation information sharing, based on which a substation differential protection algorithm based on phase set is proposed. The algorithm uses the current synchronous phasor reference citation of each branch for differential protection logic calculation, and the calculated differential current and braking current can solve protection malfunction or refuse caused by the unsynchronized SV. Finally, the simulation results show that using the differential protection algorithm based on phase set, the sensitivity and reliability are not affected under a certain extent unsynchronized SV, which ensures reliable implementation of substation differential protection. Therefore, this differential protection algorithm can be used in the new generation intelligent substation.
引文
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[3]朱林,段献忠,苏盛.基于证据理论的数字化变电站继电保护容错方法[J].电工技术学报,2011,26(1):154-161.ZHU Lin,DUAN Xianzhong,SU Sheng.Evidence theory based fault-tolerant method for protective relays in digital substations[J].Transactions of China Electrotechnical Society,2011,26(1):154-161.
[4]李振兴,尹项根.基于综合阻抗比较原理的广域继电保护算法[J].电工技术学报,2012,27(8):179-186.LI Zhenxing,YIN Xianggen.A study of wide-area protection algorithm based on integrated impedance comparison[J].Transactions of China Electrotechnical Society,2012,27(8):179-186.
[5]姜宪国,王增平.区域自治式后备保护分区方案[J].电工技术学报,2013,23(1):234-241.JIANG Xianguo,WANG Zengping.Zoning scheme of regional autonomy backup protection[J].Transactions of China Electrotechnical Society,2013,23(1):234-241.
[6]陈朝晖,赵曼勇,周红阳.基于广域一体化理念的网络保护系统研究与实施[J].电力系统保护与控制,2009,37(24):106-108,113.CHEN Zhaohui,ZHAO Manyong,ZHOU Hongyang.Research and implementation of network protection system based on integrated and wide area information[J].Power System Protection and Control,2009,37(24):106-108,113.
[7]李振兴,尹项根,张哲.广域继电保护故障区域的自适应识别方法[J].电力系统自动化,2011,35(16):15-20.LI Zhenxing,YIN Xianggen,ZHANG Zhe.An adaptive identification method of fault region for wide area protection[J].Automation of Electric Power Systems,2011,35(16):15-20.
[8]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.
[9]智能变电站继电保护通用技术条件[S].2013.
[10]王阳光,尹项根,游大海,等.遵循IEC 61850标准的广域电流差动保护IED[J].电力系统自动化,2008,32(2):53-56.WANG Yangguang,YIN Xianggen,YOU Dahai,et al.Development of wide area current differential protection IED conforming with IEC 61850[J].Automation of Electric Power Systems,2008,32(2):53-56.