谐振接地系统单相接地故障暂态特性分析
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摘要
谐振接地系统在提高配电网可靠性的同时,增加了系统发生单相接地故障时选线的难度.对此,文章通过分析不同时刻、不同接地电阻以及不同位置故障点的系统暂态特征,改变谐振接地系统单相接地故障参数,利用暂态零模分量进行比较,从而得出故障线路的判断依据.并通过PSCAD仿真软件建立谐振接地系统单相接地故障仿真模型,提取、比较故障发生时刻前后1/2周波的暂态零模分量进行暂态分析.仿真结果表明,谐振接地系统发生单相接地故障后线电压依旧三相平衡,能够维持系统正常供电;同时,故障点电流由于消弧线圈的补偿而减小,能够提高系统运行的可靠性;故障线路和非故障线路在相模变换的解耦作用下,得出的暂态零模分量具有明显的差异,可以作为故障线路的判断依据.
The resonance grounding system increases the reliability of the distribution network and increases the difficulty of selecting the line when the system has a single-phase ground fault.In this regard,the paper analyzes the transient characteristics of the system in different moments,different grounding resistances and fault locations at different locations,changes the single-phase ground fault parameters of the resonance grounding system,and compares the transient zero-mode components to obtain the basis for judging the faulty line.The single-phase grounding fault simulation model of the resonance grounding system is established by PSCAD simulation software.The transient zero-mode components of 1/2 cycle before and after the fault occurrence time are extracted and compared for transient analysis.The simulation results show that the line voltage is still balanced by the three-phase after the single-phase ground fault occurs in the resonance grounding system,which can maintain the normal power supply of the system.At the same time,the fault point current is reduced by the compensation of the arc suppression coil,which can improve the reliability of the system operation.Under the decoupling of phase-mode transformation,the faulty zero-mode components of the faulty line and the non-faulty line have obvious differences,which can be used as the basis for judging the faulty line.
The resonance grounding system increases the reliability of the distribution network and increases the difficulty of selecting the line when the system has a single-phase ground fault.In this regard,the paper analyzes the transient characteristics of the system in different moments,different grounding resistances and fault locations at different locations,changes the single-phase ground fault parameters of the resonance grounding system,and compares the transient zero-mode components to obtain the basis for judging the faulty line.The single-phase grounding fault simulation model of the resonance grounding system is established by PSCAD simulation software.The transient zero-mode components of 1/2 cycle before and after the fault occurrence time are extracted and compared for transient analysis.The simulation results show that the line voltage is still balanced by the three-phase after the single-phase ground fault occurs in the resonance grounding system,which can maintain the normal power supply of the system.At the same time,the fault point current is reduced by the compensation of the arc suppression coil,which can improve the reliability of the system operation.Under the decoupling of phase-mode transformation,the faulty zero-mode components of the faulty line and the non-faulty line have obvious differences,which can be used as the basis for judging the faulty line.
引文
[1] 李金琢,王晓宁,徐任天,等.基于10 kV电网零序电流谐波分析及故障鉴别[J].电子质量,2015(2):75-78.
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[3] 赖平,周想凌,邱丹.小电流接地系统暂态电流频率特性分析及故障选线方法研究[J].电力系统保护与控制,2015,43(4):51-57.
[4] 陈志亮,范春菊.基于5次谐波突变量的小电流接地系统选线[J].电力系统及其自动化学报,2006,18(5):37-41,69.
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[8] 宋国兵,李广,于叶云,等.基于相电流突变量的配电网单相接地故障区段定位[J].电力系统自动化,2011,35(21):84-90.
[9] 倪广魁,鲍海,张利,等.基于零序电流突变量的配电网单相故障带电定位判据[J].中国电机工程学报,2010,30(31):118-122.
[10] 梁睿,杨学君,薛雪,等.零序分布参数的单相接地故障精确定位研究[J].电工技术学报,2015,30(12):472-479.
[11] 张文海,肖先勇,汪颖.基于故障暂态信号及其衰减特征的配网单相接地故障测距[J].电力自动化设备,2013,33(3):46-52.
[12] 朱珂,王怡轩,倪建.主动干扰技术在消弧线圈接地系统故障选线中的应用[J].电力自动化设备,2017,37(10):189-196.
[13] 束洪春,刘娟,王超,等.谐振接地电网故障暂态能量自适应选线新方法[J].电力系统自动化,2006,30(11):72-76.
[14] 潘本仁,宋华茂,张秋凤,等.小电流接地故障无功功率分析及选线新方法[J].电力系统保护与控制,2017,45(14):51-56.
[15] 刘渝根,王建南,马晋佩,等.结合小波包变换和5次谐波法的谐振接地系统综合故障选线方法[J].高电压技术,2015,41(5):1 519-1 525.
[16] 李辉,唐轶,孙常青.谐振接地系统单相接地故障仿真分析[J].工矿自动化,2012,38(1):47-51.
[17] 李斌,束洪春.基于瞬时实功率和瞬时虚功率的谐振接地系统单相接地选线新方法[J].电工技术学报,2012,27(6):183-190.
[18] 郭谋发,杨耿杰,黄世远.谐振接地系统暂态特征自适应故障选线方法[J].电力自动化设备,2012,32(10):35-41.
[19] 张庆超,易乐钊.基于微扰法的不换位输电线路相模变换[J].电力系统保护与控制,2017,45(10):18-23.
[2] 苑博,邱湘可.基于PSCAD/EMTDC的小电流接地系统单相接地故障的仿真研究[J].电子设计工程,2015,23(4):36-39.
[3] 赖平,周想凌,邱丹.小电流接地系统暂态电流频率特性分析及故障选线方法研究[J].电力系统保护与控制,2015,43(4):51-57.
[4] 陈志亮,范春菊.基于5次谐波突变量的小电流接地系统选线[J].电力系统及其自动化学报,2006,18(5):37-41,69.
[5] 陈孝刚.基于EMTP/ATP的配电网单相接地故障仿真的研究[J].电气时代,2016(7):58-61.
[6] 张利.中性点非有效接地系统单相接地故障定位方法的研究[D].北京:华北电力大学,2009.
[7] Jen Hao Teng,Wei Hao Huang,Shang Wen Luan.Automatic and fast faulted line-section location method for distribution systems based on fault indicators[J].IEEE Transactions on Power systems,2014,29(4):1 653-1 662.
[8] 宋国兵,李广,于叶云,等.基于相电流突变量的配电网单相接地故障区段定位[J].电力系统自动化,2011,35(21):84-90.
[9] 倪广魁,鲍海,张利,等.基于零序电流突变量的配电网单相故障带电定位判据[J].中国电机工程学报,2010,30(31):118-122.
[10] 梁睿,杨学君,薛雪,等.零序分布参数的单相接地故障精确定位研究[J].电工技术学报,2015,30(12):472-479.
[11] 张文海,肖先勇,汪颖.基于故障暂态信号及其衰减特征的配网单相接地故障测距[J].电力自动化设备,2013,33(3):46-52.
[12] 朱珂,王怡轩,倪建.主动干扰技术在消弧线圈接地系统故障选线中的应用[J].电力自动化设备,2017,37(10):189-196.
[13] 束洪春,刘娟,王超,等.谐振接地电网故障暂态能量自适应选线新方法[J].电力系统自动化,2006,30(11):72-76.
[14] 潘本仁,宋华茂,张秋凤,等.小电流接地故障无功功率分析及选线新方法[J].电力系统保护与控制,2017,45(14):51-56.
[15] 刘渝根,王建南,马晋佩,等.结合小波包变换和5次谐波法的谐振接地系统综合故障选线方法[J].高电压技术,2015,41(5):1 519-1 525.
[16] 李辉,唐轶,孙常青.谐振接地系统单相接地故障仿真分析[J].工矿自动化,2012,38(1):47-51.
[17] 李斌,束洪春.基于瞬时实功率和瞬时虚功率的谐振接地系统单相接地选线新方法[J].电工技术学报,2012,27(6):183-190.
[18] 郭谋发,杨耿杰,黄世远.谐振接地系统暂态特征自适应故障选线方法[J].电力自动化设备,2012,32(10):35-41.
[19] 张庆超,易乐钊.基于微扰法的不换位输电线路相模变换[J].电力系统保护与控制,2017,45(10):18-23.