混压同塔四回线跨电压不接地故障下的距离保护适应性分析
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摘要
混压同塔多回线输电方式因其具有传输容量大、占用土地资源少等优势,在国内外得以较多应用。两个不同电压等级线路间的跨电压故障是混压同塔输电方式下的一种常见故障形式,已有文献开展了跨电压接地故障对距离保护的影响研究。但对于跨电压不接地故障,因其分析更为复杂,尚未见相关研究。以跨电压不接地故障为研究对象,分析了其对接地距离保护和相间距离保护的影响。基于复合序网的混压同塔多回线跨电压故障分析方法,计算分析了跨电压不接地故障时测量阻抗的变化规律,得出其大小与故障点位置和两不同电压系统特殊相电源相角差有关的结论,并进一步指出其与接地故障下的测量阻抗区别及其原因。同时对非完全故障相的相间距离保护的动作情况进行了讨论,指出其存在误动的可能性。最后,在PSCAD中构建了500 kV/220 kV混压同塔四回输电线路模型,通过大量仿真实验,验证了理论分析的正确性。
The mixed-voltage multi-circuit transmission lines are widely used at home and abroad because of its advantages of large transmission capacity and small land resources. The cross-voltage fault between two different voltage-level lines is a common fault form under the mixed-line transmission mode. The literature has studied the influence of the grounding condition of the fault on the distance protection. No literature about non-grounding cross-voltage short-circuit is found, and it is more difficult to analyze. In this paper, the cross-voltage phase-to-phase fault is taken as the object, and its influence on ground and phase-to-phase distance protection is analyzed separately. Based on the method of calculating the fault current of mixed-voltage lines on the same tower in the composite sequence network, this paper calculates the variation law of the measured impedance when the non-grounding cross-voltage short-circuit occurs, draws the conclusion that the amount is related to the position of the fault point and the phase angle of the special phase of the two systems, and points out the difference between them and its cause. The performance of the phase-to-phase distance protection of the non-complete fault phase is discussed, and the possibility of maloperation is pointed out. Finally, a model of 500 kV/220 kV four-circuit transmission line on the same tower is built in PSCAD to verify the proposed analysis.
The mixed-voltage multi-circuit transmission lines are widely used at home and abroad because of its advantages of large transmission capacity and small land resources. The cross-voltage fault between two different voltage-level lines is a common fault form under the mixed-line transmission mode. The literature has studied the influence of the grounding condition of the fault on the distance protection. No literature about non-grounding cross-voltage short-circuit is found, and it is more difficult to analyze. In this paper, the cross-voltage phase-to-phase fault is taken as the object, and its influence on ground and phase-to-phase distance protection is analyzed separately. Based on the method of calculating the fault current of mixed-voltage lines on the same tower in the composite sequence network, this paper calculates the variation law of the measured impedance when the non-grounding cross-voltage short-circuit occurs, draws the conclusion that the amount is related to the position of the fault point and the phase angle of the special phase of the two systems, and points out the difference between them and its cause. The performance of the phase-to-phase distance protection of the non-complete fault phase is discussed, and the possibility of maloperation is pointed out. Finally, a model of 500 kV/220 kV four-circuit transmission line on the same tower is built in PSCAD to verify the proposed analysis.
引文
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[9]张健康,栗小华,胡勇. 750 kV同塔双回线接地距离保护整定计算[J].电力系统自动化,2009,33(22):102-105.ZHANGJiankang,LIXiaohua,HUYong.Setting calculationofgrounddistanceprotectionfor750k V double circuit lines on the same tower[J]. Automation of Electric Power Systems, 2009, 33(22):102-105.
[10]张保会.电力系统继电保护[M].北京:中国电力出版社, 2005.
[11]李斌,廖惠琴,戴冬康,等.局部同塔输电线路的接地距离保护影响及对策[J].电力系统及其自动化学报,2017, 29(12):1-7, 13.LIBin,LIAOHuiqin,DAIDongkang,etal.Effecton ground distance protection and measures for transmission lines partially on the same tower[J]. Proceedings of the CSU-EPSA, 2017, 29(12):1-7, 13.
[12]徐海洋,黄兴华,王婷,等.同塔双回线零序电压补偿分析[J].电力系统保护与控制, 2017, 45(4):86-92.XUHaiyang,HUANGXinghua,WANGTing,etal.Analysis of zero-sequence voltage compensation in doublecircuit transmission system[J]. Power System Protection and Control, 2017, 45(4):86-92.
[13]姜宪国,刘宇,周泽昕,等.同塔双回线接地距离保护零序电流补偿系数分析及整定方法改进[J].电力自动化设备, 2015, 35(8):9-14, 30.JIANG Xianguo, LIU Yu, ZHOU Zexin, et al. Analysis of zero-sequencecurrentcompensationcoefficientand improvementofsettingmethodforgroundingdistance protection of dual-loop lines on the same tower[J]. Electric Power Automation Equipment, 2015, 35(8):9-14, 30.
[14]徐海洋,黄兴华,王婷,等.同塔双回线零序电压补偿分析[J].电力系统保护与控制, 2017, 45(4):86-92.XUHaiyang,HUANGXinghua,WANGTing,etal.Analysisofzero-sequencevoltagecompensationin double-circuittransmissionsystem[J].PowerSystem Protection and Control, 2017, 45(4):86-92.
[15]李博通,李永丽,陈莉,等.同塔四回线参数解耦及故障分析方法[J].电力系统保护与控制,2010,38(19):1-9.LIBotong,LIYongli,CHENLi,etal.Methodfor parameterdecouplingandfaultanalysisoffour-circuit transmissionlinesonthesametower[J].PowerSystem Protection and Control, 2010, 38(19):1-9.
[16]刘玲,范春菊.基于六序分量法的跨电压等级的同塔四回线的故障计算[J].电力系统保护与控制,2010,38(9):6-11.LIU Ling, FAN Chunju. Fault calculation for joint four transmission lines of different voltage grades on the same tower based on six-sequence-component method[J]. Power System Protection and Control, 2010, 38(9):6-11.
[17]黄少锋,刘欣,王洪敏,等.混压同塔四回线跨电压故障的短路计算[J].中国电机工程学报,2016,36(4):993-1001.HUANGShaofeng,LIUXin,WANGHongmin,etal.Cross-voltageshort-calculationonmixed-voltagefourcircuit lines system[J].Proceedingsof the CSEE, 2016,36(4):993-1001.
[18]郑涛,吴丹,张嘉琴,等.混压同塔四回线强电弱磁系统跨电压不接地故障短路计算[J].电力系统自动化,2017, 41(15):155-161.ZHENGTao,WUDan,ZHANGJiaqin,etal.Shortcircuitcalculationofcross-voltageunearthedfaultin strong-electricandweak-magneticsystemofmixedvoltagefour-circuitlinesonthesametower[J].AutomationofElectricPowerSystems,2017,41(15):155-161.
[19]刘欣,黄少锋,张鹏.相电流差突变量选相在混压同塔输电线跨电压故障中的适应性分析[J].电工技术学报, 2015, 30(21):118-126.LIU Xin, HUANG Shaofeng, ZHANG Peng. Adaptability analysisofphase-selectorbasedonsudden-changeof phase-current-differenceincross-voltagefaultoccurred inmixed-voltagetransmissionlines[J].Transactionsof China Electrotechnical Society, 2015, 30(21):118-126.
[20] ZHENG Tao, ZHANG Jiaqin, WU Dan, et al. Cross-voltage short-circuitcalculationformixed-voltagequadruplecircuitlinesonthesametower[J].IETGeneration,Transmission&Distribution, 2017, 11(9):2342-2350.
[2]雷霖,赖真良,朱家龙,等.工频变化量距离继电器耐受过渡电阻性能分析[J].电力系统保护与控制,2017,45(17):26-33.LEI Lin, LAI Zhenliang, ZHU Jialong, et al. Performance analysis of endure transition resistance of distance relay basedonthepower-frequencyvoltageandcurrent variation[J]. Power System Protection and Control, 2017,45(17):26-33.
[3]张旭升,李旭,樊占峰,等.同塔四回线路纵向故障对零序方向保护的影响研究[J].电力系统保护与控制,2017, 45(7):114-120.ZHANGXusheng,LIXu,FANZhanfeng,etal.Influence research of longitudinal fault on zero sequence direction protection for four parallel transmission lines on the same tower[J]. Power System Protection and Control,2017, 45(7):114-120.
[4]赵凯超,周泽昕,杜丁香.不同电压等级同塔四回输电线路不运行方式下零序互感对接地距离保护的影响[J].电网技术, 2010, 34(12):193-197.ZHAO Kaichao, ZHOU Zexin, DU Dingxiang. Influence ofzero-sequencemutualinductanceonearth-fault distanceprotectionforfour-circuittransmissionlines belongingtodifferentvoltageclassesonsametower underdifferentoperationmodes[J].PowerSystem Technology, 2010, 34(12):193-197.
[5]黄少锋.电力系统继电保护[M].北京:中国电力出版社, 2015.
[6]黄少锋,刘欣,张鹏,等.混压同塔线路跨电压接地故障对距离保护的影响分析[J].电力系统自动化,2016,40(1):96-101.HUANGShaofeng,LIUXin,ZHANGPeng,etal.Influence on distance protection caused by earthed crossvoltage fault in multi-circuit transmission lines system[J].AutomationofElectricPowerSystems,2016,40(1):96-101.
[7]张旭,徐振宇,贺健,等.同塔四回线路单相接地故障距离保护[J].电力自动化设备, 2015, 35(9):30-36, 42.ZHANGXu,XUZhenyu,HEJian,etal.Distance protectionforsingle-phasegroundingfaultoffour-loop transmissionlinesonsametower[J].ElectricPower Automation Equipment, 2015, 35(9):30-36, 42.
[8]张颖,邰能灵.同塔四回线接地距离保护的分析[J].电力系统保护与控制, 2010, 38(12):1-6.ZHANGYing,TAINengling.Analysisofground distanceprotectionforquadruple-circuittransmission lines on the same tower[J]. Power System Protection and Control, 2010, 38(12):1-6.
[9]张健康,栗小华,胡勇. 750 kV同塔双回线接地距离保护整定计算[J].电力系统自动化,2009,33(22):102-105.ZHANGJiankang,LIXiaohua,HUYong.Setting calculationofgrounddistanceprotectionfor750k V double circuit lines on the same tower[J]. Automation of Electric Power Systems, 2009, 33(22):102-105.
[10]张保会.电力系统继电保护[M].北京:中国电力出版社, 2005.
[11]李斌,廖惠琴,戴冬康,等.局部同塔输电线路的接地距离保护影响及对策[J].电力系统及其自动化学报,2017, 29(12):1-7, 13.LIBin,LIAOHuiqin,DAIDongkang,etal.Effecton ground distance protection and measures for transmission lines partially on the same tower[J]. Proceedings of the CSU-EPSA, 2017, 29(12):1-7, 13.
[12]徐海洋,黄兴华,王婷,等.同塔双回线零序电压补偿分析[J].电力系统保护与控制, 2017, 45(4):86-92.XUHaiyang,HUANGXinghua,WANGTing,etal.Analysis of zero-sequence voltage compensation in doublecircuit transmission system[J]. Power System Protection and Control, 2017, 45(4):86-92.
[13]姜宪国,刘宇,周泽昕,等.同塔双回线接地距离保护零序电流补偿系数分析及整定方法改进[J].电力自动化设备, 2015, 35(8):9-14, 30.JIANG Xianguo, LIU Yu, ZHOU Zexin, et al. Analysis of zero-sequencecurrentcompensationcoefficientand improvementofsettingmethodforgroundingdistance protection of dual-loop lines on the same tower[J]. Electric Power Automation Equipment, 2015, 35(8):9-14, 30.
[14]徐海洋,黄兴华,王婷,等.同塔双回线零序电压补偿分析[J].电力系统保护与控制, 2017, 45(4):86-92.XUHaiyang,HUANGXinghua,WANGTing,etal.Analysisofzero-sequencevoltagecompensationin double-circuittransmissionsystem[J].PowerSystem Protection and Control, 2017, 45(4):86-92.
[15]李博通,李永丽,陈莉,等.同塔四回线参数解耦及故障分析方法[J].电力系统保护与控制,2010,38(19):1-9.LIBotong,LIYongli,CHENLi,etal.Methodfor parameterdecouplingandfaultanalysisoffour-circuit transmissionlinesonthesametower[J].PowerSystem Protection and Control, 2010, 38(19):1-9.
[16]刘玲,范春菊.基于六序分量法的跨电压等级的同塔四回线的故障计算[J].电力系统保护与控制,2010,38(9):6-11.LIU Ling, FAN Chunju. Fault calculation for joint four transmission lines of different voltage grades on the same tower based on six-sequence-component method[J]. Power System Protection and Control, 2010, 38(9):6-11.
[17]黄少锋,刘欣,王洪敏,等.混压同塔四回线跨电压故障的短路计算[J].中国电机工程学报,2016,36(4):993-1001.HUANGShaofeng,LIUXin,WANGHongmin,etal.Cross-voltageshort-calculationonmixed-voltagefourcircuit lines system[J].Proceedingsof the CSEE, 2016,36(4):993-1001.
[18]郑涛,吴丹,张嘉琴,等.混压同塔四回线强电弱磁系统跨电压不接地故障短路计算[J].电力系统自动化,2017, 41(15):155-161.ZHENGTao,WUDan,ZHANGJiaqin,etal.Shortcircuitcalculationofcross-voltageunearthedfaultin strong-electricandweak-magneticsystemofmixedvoltagefour-circuitlinesonthesametower[J].AutomationofElectricPowerSystems,2017,41(15):155-161.
[19]刘欣,黄少锋,张鹏.相电流差突变量选相在混压同塔输电线跨电压故障中的适应性分析[J].电工技术学报, 2015, 30(21):118-126.LIU Xin, HUANG Shaofeng, ZHANG Peng. Adaptability analysisofphase-selectorbasedonsudden-changeof phase-current-differenceincross-voltagefaultoccurred inmixed-voltagetransmissionlines[J].Transactionsof China Electrotechnical Society, 2015, 30(21):118-126.
[20] ZHENG Tao, ZHANG Jiaqin, WU Dan, et al. Cross-voltage short-circuitcalculationformixed-voltagequadruplecircuitlinesonthesametower[J].IETGeneration,Transmission&Distribution, 2017, 11(9):2342-2350.