信息物理融合视角下的电流纵差保护可靠性分析
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摘要
现代电网已经具备信息-物理紧密融合的特征,电流差动保护是信息物理紧密耦合的典型应用,因此,有必要从信息物理融合的视角研究其可靠性。从物理-量测-通信-决策的完整闭环控制过程出发,分析线路电流、互感器测量误差、通信延时及保护判据(分析决策)等信息物理因素对电流差动保护的综合影响,提出电力信息物理系统视角下电流差动保护业务的误动概率模型。然后,通过仿真算例验证了模型的合理性,并分析了影响电流差动保护误动的关键因素。
Modern power system is developing into a cyber physical power system(CPPS).The current differential protection is a typical application with ICT and physical function tightly coupled.So it is necessary to study its reliability from the perspective of CPPS.On the basis of the closed-loop control process of physical-measurement-communication-decision making,the paper analyzes the integrated effects of cyber and physical factors,such as line current,measurement error of CT,communication delay and protection criteria,on the current differential protection,and proposes the mis-operation probability model of the current differential protection.On that basis,a simulation is performed to verify the model,and the key factors affecting the reliability are analyzed.
Modern power system is developing into a cyber physical power system(CPPS).The current differential protection is a typical application with ICT and physical function tightly coupled.So it is necessary to study its reliability from the perspective of CPPS.On the basis of the closed-loop control process of physical-measurement-communication-decision making,the paper analyzes the integrated effects of cyber and physical factors,such as line current,measurement error of CT,communication delay and protection criteria,on the current differential protection,and proposes the mis-operation probability model of the current differential protection.On that basis,a simulation is performed to verify the model,and the key factors affecting the reliability are analyzed.
引文
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[15]WU Y,LI M,TANG Y,et al.Reliability analysis models for differential protection considering communication delays and errors[J].Energies,2015,8(4):2454-2472.
[16]欧阳利剑,许庆强,徐青山,等.差动判据受通道收发不一致延时影响的试验分析研究[J].电力系统保护与控制,2011,39(8):80-85.OUYANG Lijian,XU Qingqiang,XU Qingshan,et al.Experiment analysis and research of the effect of channel inconsistent delay on the differential criterion[J].Power Systems Protection and Control,2011,39(8):80-85.
[2]汤奕,王琦,倪明,等.电力信息物理融合系统中的网络攻击分析[J].电力系统自动化,2016,40(6):148-151.TANG Yi,WANG Qi,NI Ming,et al.Analysis of cyber attacks in cyber physical power system[J].Automation of Electric Power Systems,2016,40(6):148-151.
[3]WANG Q,PIPATTANASOMPORN M,KUZLE M,et al.Framework for vulnerability assessment of communication systems for electric power grids[J].IET Generation Transmission&Distribution,2016,10(2):477-486.
[4]邓良辰,刘艳丽,余贻鑫,等.考虑故障处理全过程的配电网信息物理系统可靠性评估[J].电力自动化设备,2017,37(12):22-29.DENG Liangchen,LIU Yanli,YU Yixin,et al.Reliability assessment of distribution network CPS considering whole fault processing[J].Electric Power Automation Equipment,2017,37(12):22-29.
[5]俞斌,郭创新,王越,等.考虑信息系统作用的电力系统可靠性研究[J].电力系统保护与控制,2013,41(7):7-13.YU Bin,GUO Chuangxin,WANG Yue,et al.Research on the reliability of the power system considering impacts of the information system[J].Power System Protection and Control,2013,41(7):7-13.
[6]郭嘉,韩宇奇,郭创新,等.考虑监视与控制功能的电网信息物理系统可靠性评估[J].中国电机工程学报,2016,36(8):2123-2130.GUO Jia,HAN Yuqi,GUO Chuangxin,et al.Reliability assessment of cyber physical power system considering monitoring function and control function[J].Proceedings of the CSEE,2016,36(8):2123-2130.
[7]HAN Yuqu,WEN Yunfeng,GUO Chuanxin,et al.Incorporating cyber layer failures in composite power system reliability evaluations[J].Energies,2015,8(9):9064-9086.
[8]FALAHATI B,FU Yong,WU Lei.Reliability assessment of smart grid considering direct cyber-power interdependencies[J].IEEETransactions on Smart Grid,2012,3(3):1515-1524.
[9]中国信息物理系统发展论坛.信息物理系统白皮书(2017)[R].北京:中国信息物理系统发展论坛,2017.
[10]薛禹胜,李满礼,罗剑波,等.基于关联特性矩阵的电网信息物理系统耦合建模方法[J].电力系统自动化,2018,42(2):11-19.XUE Yuesheng,LI Manli,LUO Jianbo,et al.Coupling modeling method for cyber physical power systems based on correlation characteristic matrix[J].Automation of Electric Power Systems,2018,42(2):11-19.
[11]LI M,NI M,XUE Y,et al.Hybrid calculation architecture of cyber physical power system based on correlative characteristic matrix model[C]//IEEE International Conference on Cyber Technology in Automation,Control,and Intelligent Systems.IEEE,2018:584-588.
[12]柳焕章,王兴国,周泽昕,等.一种利用电流突变量采样值的电流互感器饱和识别方法[J].电网技术,2016,40(11):3574-3579.LIU Huanzhang,WANG Xingguo,ZHOU Zexin,et al.A CTsaturation identification method using sampled current fault component data[J].Power System Technology,2016,40(11):3574-3579.
[13]许扬,陆于平,卜强生,等.光纤电流互感器对保护精度和可靠性的影响分析[J].电力系统自动化,2013,37(16):119-124.XU Yang,LU Yuping,BU Qiangsheng,et al.Analysis for effect of fiber-optic current transformer on protection accuracy and reliability[J].Automation of Electric Power Systems,2013,37(16):119-124.
[14]尚秋峰,张静,董建彬.电子式电流互感器校准系统不确定度评定方法[J].电力系统自动化,2008,32(18):63-66.SHANG Qiufeng,ZHANG Jing,DONG Jianbin.Evaluation of measurement uncertainty for the calibration system of electronic current transformer[J].Automation of Electric Power Systems,2008,32(18):63-66.
[15]WU Y,LI M,TANG Y,et al.Reliability analysis models for differential protection considering communication delays and errors[J].Energies,2015,8(4):2454-2472.
[16]欧阳利剑,许庆强,徐青山,等.差动判据受通道收发不一致延时影响的试验分析研究[J].电力系统保护与控制,2011,39(8):80-85.OUYANG Lijian,XU Qingqiang,XU Qingshan,et al.Experiment analysis and research of the effect of channel inconsistent delay on the differential criterion[J].Power Systems Protection and Control,2011,39(8):80-85.