大串补线路电流差动保护拒动因素及改进保护方法
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摘要
大串联补偿设备在超高压输电系统中得到越来越广泛的应用,伴随着复杂多系统的互联,含大串联补偿设备的线路(简称串补线路)在特定运行方式下出现线路背侧系统阻抗较小,可能导致线路内部故障时系统电流反向,此时串补线路电流差动保护可能会因灵敏度不足而拒动。基于此,详细分析了串补线路电流反向的原因及其对差动保护的影响。重点对不同串补度、系统功角差和过渡电阻等影响因素下的差动保护的动作特性进行研究。进一步地,为解决差动保护拒动问题,提出一种基于串补线路两侧电流幅相综合制动的电流差动保护改进判据,该判据能够有效解决串补线路内部故障时灵敏度降低的问题。仿真结果显示,相比传统差动保护,改进方案能够明显提高保护灵敏度。
High series capacitor compensation device is more and more widely applied in EHV power transmission system. With the complex interconnection of multiple power systems,the system impedance in the back of transmission line with high series compensation maybe smaller in a certain operating mode,thus the fault current may reverse during the internal line fault,due to which,the current differential protection in transmission line with high series compensation may be rejected because of the lack of sensitivity. On this basis,the reasons of current reversion in power transmission line with high series compensation and its effect on differential protection are analyzed. The operation characteristics of differential protection under the multiple factors such as different series compensation degree,power angle difference and transition resistance are emphatically studied. Furthermore,the improved criteria based on the current amplitudes and phases at both sides of power transmission line with high series compensation are proposed to avoid the maloperation of current differential protection,which effectively improve the low protection sensitivity during the internal fault of transmission line with high series compensation. The simulative results show that the improvement scheme can obviously increase the protection sensitivity.
High series capacitor compensation device is more and more widely applied in EHV power transmission system. With the complex interconnection of multiple power systems,the system impedance in the back of transmission line with high series compensation maybe smaller in a certain operating mode,thus the fault current may reverse during the internal line fault,due to which,the current differential protection in transmission line with high series compensation may be rejected because of the lack of sensitivity. On this basis,the reasons of current reversion in power transmission line with high series compensation and its effect on differential protection are analyzed. The operation characteristics of differential protection under the multiple factors such as different series compensation degree,power angle difference and transition resistance are emphatically studied. Furthermore,the improved criteria based on the current amplitudes and phases at both sides of power transmission line with high series compensation are proposed to avoid the maloperation of current differential protection,which effectively improve the low protection sensitivity during the internal fault of transmission line with high series compensation. The simulative results show that the improvement scheme can obviously increase the protection sensitivity.
引文
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[16]李斌,曾红艳,范瑞卿,等.基于故障分量的相位相关电流差动保护[J].电力系统自动化,2011,35(3):54-58.LI Bin,ZENG Hongyan,FAN Ruiqing,et al.Phase correlation current differential protection based on fault component[J].Automation of Electric Power Systems,2011,35(3):54-58.
[17]唐萃,尹项根,戚宣威,等.大串补度输电线路的电流差动保护分析与对策[J].电力系统自动化,2015,39(7):156-163.TANG Cui,YIN Xianggen,QI Xuanwei,et al.Analysis and countermeasures of current differential protection on transmission line with high series compensation degree[J].Automation of Electric Power Systems,2015,39(7):156-163.
[2]刘淑磊,陈福锋,何奔腾.基于补偿点阻抗的阻抗角特性的串补线路距离保护方法[J].电力系统自动化,2010,34(21):70-73.LIU Shulei,CHEN Fufeng,HE Benteng.Distance protection principle for series compensated lines based on the impedance angle of the compensated point[J].Automation of Electric Power Systems,2010,34(21):70-73.
[3]王育学,尹项根,张哲,等.基于参数识别原理的串补线路距离保护[J].电力系统自动化,2011,35(14):98-102.WANG Yuxue,YIN Xianggen,ZHANG Zhe,et al.Distance protection for series compensated lines based on parameter identification principle[J].Automation of Electric Power Systems,2011,35(14):98-102.
[4]索南加乐,谈树峰,何世恩,等.基于模型识别的串补线路方向元件[J].电力系统自动化,2009,33(14):66-70.SUONAN Jiale,TAN Shufeng,HE Shien,et al.Directional element for series compensated lines based on model identification[J].Automation of Electric Power Systems,2009,33(14):66-70.
[5]高超,郑涛,毕天姝,等.特高压多串补系统电流特性分析[J].电工技术学报,2015,30(20):193-198.GAO Chao,ZHENG Tao,BI Tianshu,et al.Analysis on current characteristics of ultra high transmission line with multi series compensation capacitors[J].Transactions of China Electrotechnical Society,2015,30(20):193-198.
[6]王兴国,杜丁香,周春霞,等.多串补线路保护动作性能分析[J].电网技术,2012,36(5):190-197.WANG Xingguo,DU Dingxiang,ZHOU Chunxia,et al.Analysis on protection performance of transmission line with multi series compensation capacitors[J].Power System Technology,2012,36(5):190-197.
[7]朱晓彤,黄蕙,徐晓春,等.串联补偿线路电流反向对差动保护的影响及对策[J].电力系统自动化,2015,39(14):151-155.ZHU Xiaotong,HUANG Hui,XU Xiaochun,et al.Influence and countermeasures for current reversal on differential protection of series compensated lines[J].Automation of Electric Power Systems,2015,39(14):151-155.
[8]马静,裴讯,马伟,等.基于故障分量虚拟阻抗的线路差动保护原理[J].电力自动化设备,2014,34(12):58-69.MA Jing,PEI Xun,MA Wei,et al.Differential protection principle based on virtual impedance of fault component for power transmission line[J].Electric Power Automation Equipment,2014,34(12):58-69.
[9]XU Z Y,DU Z Q,RAN L,et al.A current differential relay for a 1 000 k V UHV transmission line[J].IEEE Transactions on Power Delivery,2007,22(3):1392-1399.
[10]肖仕武,程艳杰,王亚,等.基于贝瑞隆模型的半波长交流输电线路电流差动保护原理[J].电网技术,2011,39(5):46-50.XIAO Shiwu,CHENG Yanjie,WANG Ya,et al.A Bergeron model based current differential protection principle for UHV half-wave length AC transmission line[J].Power System Technology,2011,39(5):46-50.
[11]刘凯.超/特高压线路差动保护电容电流补偿方法[J].电力自动化设备,2011,31(8):94-98.LIU Kai.Capacitive current compensation method for differential protection of EHV/UHV lines[J].Electric Power Automation Equipment,2011,31(8):94-98.
[12]丛伟,张琳琳,程学启,等.基于故障电流幅值与相位差的电流差动保护判据[J].电力自动化设备,2013,33(5):26-30.CONG Wei,ZHANG Linlin,CHENG Xueqi,et al.Criterion of current differential protection based on amplitude and phase difference of fault current[J].Electric Power Automation Equipment,2013,33(5):26-30.
[13]SANJAY D,SOMAN S A,CHANDORKAR M C.Adaptive current differentia protection schemes for transmission line protection[J].IEEE Transactions on Power Delivery,2009,24(4):1832-1841.
[14]夏经德,索南加乐,王志恩,等.基于纵联阻抗相角的输电线路纵联保护[J].电力自动化设备,2011,31(5):20-27.XIA Jingde,SUONAN Jiale,WANG Zhien,et al.Transmission line pilot protection based on pilot impedance angle[J].Electric power Automation Equipment,2011,31(5):20-27.
[15]周启文,潘勇斌,王德昌,等.500 k V串补系统中花火间隙系统研究[J].高压电器,2012,48(8):40-44.ZHOU Qiwen,PAN Yongbin,WANG Dechang,et al.Improvement of spark gap system for 500 k V series compensation system[J].High Voltage Apparatus,2012,48(8):40-44.
[16]李斌,曾红艳,范瑞卿,等.基于故障分量的相位相关电流差动保护[J].电力系统自动化,2011,35(3):54-58.LI Bin,ZENG Hongyan,FAN Ruiqing,et al.Phase correlation current differential protection based on fault component[J].Automation of Electric Power Systems,2011,35(3):54-58.
[17]唐萃,尹项根,戚宣威,等.大串补度输电线路的电流差动保护分析与对策[J].电力系统自动化,2015,39(7):156-163.TANG Cui,YIN Xianggen,QI Xuanwei,et al.Analysis and countermeasures of current differential protection on transmission line with high series compensation degree[J].Automation of Electric Power Systems,2015,39(7):156-163.