基于矢量偏离度的风电场集电线路故障定位方法
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摘要
为解决风电场集电线路因短路故障造成的弃风窝电问题,提出了基于矢量偏离度的风电场集电线路故障区间定位方法。该方法根据各终端测量装置的电气量信息,采用综合矢量误差和三相总不平衡度构建了风电场短路故障时的理论计算值与真实测量值的矢量偏离度目标函数。根据偏离度计算结果,判断真实故障时的故障信息与假想故障区间信息的差异程度,最小差异对应的假想故障区间即为真实的故障区间。PSCAD/EMTDC仿真验证了所提方法在不同故障位置、故障区间、过渡电阻情况下的可行性,能够满足风电场对其集电线路故障定位精度的要求。
In order to solve the problem of wind curtailment and poor power transmission ability caused by short-circuit faults in wind farm collection lines, a fault location method for wind farm collection lines based on vector deviation is proposed. According to the electrical information of each terminal measurement device, the objective function of vector deviation between the theoretical calculation value and the real measurement value is constructed by using total vector error(TVE) and total three-phase unbalance. According to the calculation results of deviation degree, the difference between the information of real fault and imaginary fault interval is judged. The imaginary fault interval corresponding to the minimum difference is the real fault interval. PSCAD/EMTDC simulation results show that the proposed method is feasible for different fault locations, different fault intervals and different transition resistances, and can meet the requirements of wind farm for the accuracy of collection line fault location.
In order to solve the problem of wind curtailment and poor power transmission ability caused by short-circuit faults in wind farm collection lines, a fault location method for wind farm collection lines based on vector deviation is proposed. According to the electrical information of each terminal measurement device, the objective function of vector deviation between the theoretical calculation value and the real measurement value is constructed by using total vector error(TVE) and total three-phase unbalance. According to the calculation results of deviation degree, the difference between the information of real fault and imaginary fault interval is judged. The imaginary fault interval corresponding to the minimum difference is the real fault interval. PSCAD/EMTDC simulation results show that the proposed method is feasible for different fault locations, different fault intervals and different transition resistances, and can meet the requirements of wind farm for the accuracy of collection line fault location.
引文
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[15] 肖繁.适用于新能源规模化接入的电网继电保护关键问题研究[D].武汉:华中科技大学,2016.XIAO Fan.Study on the key problems of relay protection in the power grid withe large-scale renewable energy sources[D].Wuhan:Huazhong University of Science and Technology,2016.
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[2] 宋国兵,陶然,李斌,等.含大规模电力电子装备的电力系统故障分析与保护综述[J].电力系统自动化,2017,41(12):2-12.DOI:10.7500/AEPS20170502006.SONG Guobing,TAO Ran,LI Bin,et al.Survey of fault analysis and protection for power system with large scale power electronic equipments[J].Automation of Electric Power Systems,2017,41(12):2-12.DOI:10.7500/AEPS 20170502006.
[3] 陈旭,朱永利,高艳丰,等.基于故障分支快速辨识的T型高压输电线路故障定位新算法[J].电力系统自动化,2016,40(4):105-110.CHEN Xu,ZHU Yongli,GAO Yanfeng,et al.A new fault location algorithm for high-voltage three-terminal transmission tines based on fault branch fast identification[J].Automation of Electric Power Systems,2016,40(4):105-110.
[4] 于玉泽,覃剑,李功新,等.电缆-架空线混合线路故障测距方法综述[J].电网技术,2006,30(17):64-69.YU Yuze,QIN Jian,LI Gongxin,et al.A survey on fault location methods for hybrid transmission lines consisting of power cables and overhead lines[J].Power System Technology,2006,30(17):64-69.
[5] 唐学用,黄民翔,尹晓光,等.电缆-架空线混合输电线路故障测距方法研究[J].电力系统保护与控制,2011,39(14):69-73.TANG Xueyong,HUANG Minxiang,YIN Xiaoguang,et al.A study on fault locating methods based on hybrid transmission lines consisting of power cables and overhead lines[J].Power System Protection and Control,2011,39(14):69-73.
[6] 季涛,孙同景,徐丙垠,等.配电混合线路双端行波故障测距技术[J].中国电机工程学报,2006,26(12):89-94.JI Tao,SUN Tongjing,XU Bingyin,et al.Study on fault location of distribution mixed feeders based on double terminal method of traveling waves[J].Proceedings of the CSEE,2006,26(12):89-94.
[7] WENG J,LIU D,LUO N,et al.Distributed processing based fault location,isolation,and service restoration method for active distribution network[J].Journal of Modern Power Systems and Clean Energy,2015,3(4):494-503.
[8] DONG X,WANG J,SHI S,et al.Traveling wave based single-phase-to-ground protection method for power distribution system[J].CSEE Journal of Power & Energy Systems,2015,1(2):75-82.
[9] 贾清泉,郑旭然,刘楚,等.基于故障方向测度的配电网故障区段定位方法[J].中国电机工程学报,2017,37(20):5933-5941.JIA Qingquan,ZHENG Xuran,LIU Chu,et al.A method of fault section location in distribution networks based on fault direction measures[J].Proceedings of the CSEE,2017,37(20):5933-5941.
[10] 于华楠,马聪聪,王鹤.基于压缩感知估计行波自然频率的输电线路故障定位方法研究[J].电工技术学报,2017,32(23):140-148.YU Huanan,MA Congcong,WANG He.Transmission line fault location method based on compressed sensing estimation of traveling wave natural frequencies[J].Transactions of China Electrotechnical Society,2017,32(23):140-148.
[11] 张颖,周韧,钟凯.改进蚁群算法在复杂配电网故障区段定位中的应用[J].电网技术,2011,35(1):224-228.ZHANG Ying,ZHOU Ren,ZHONG Kai.Application of improved ant colony algorithm in fault-section location of complex distribution network[J].Power System Technology,2011,35(1):224-228.
[12] 范国琛,朱永利,史金茂,等.基于Kaiser自卷积窗的相位比较式输电线路故障定位方法[J].电力系统保护与控制,2015,43(7):143-148.FAN Guochen,ZHU Yongli,SHI Jinmao,et al.Fault location scheme for transmission lines using Kaiser self-convolution windowed FFT phase comparison[J].Power System Protection and Control,2015,43(7):143-148.
[13] 杨林,王宾,董新洲.高压直流输电线路故障测距研究综述[J].电力系统自动化,2018,42(8):185-191.DOI:10.7500/AEPS20170912011.YANG Lin,WANG Bin,DONG Xinzhou.Overview of fault location methods in high voltage direct current transmission lines[J].Automation of Electric Power Systems,2018,42(8):185-191.DOI:10.7500/AEPS20170912011.
[14] 王晨清,宋国兵,迟永宁,等.风电系统故障特征分析[J].电力系统自动化,2015,39(21):52-58.WANG Chenqing,SONG Guobing,CHI Yongning,et al.Fault characteristics analysis of wind power system[J].Automation of Electric Power Systems,2015,39(21):52-58.
[15] 肖繁.适用于新能源规模化接入的电网继电保护关键问题研究[D].武汉:华中科技大学,2016.XIAO Fan.Study on the key problems of relay protection in the power grid withe large-scale renewable energy sources[D].Wuhan:Huazhong University of Science and Technology,2016.
[16] 贺春,任春梅.相量测量单元综合矢量误差指标分析[J].电力系统自动化,2012,36(4):110-113.HE Chun,REN Chunmei.An analysis of vector error limit to phasor measurement unit[J].Automation of Electric Power Systems,2012,36(4):110-113.
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