基于改进方向电流法的特高压直流输电线路故障识别
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摘要
可靠、精准地识别特高压直流输电系统故障是区内、外保护动作的基础,对整个直流输电系统安全可靠运行具有决定性意义。基于贝瑞隆分布参数模型,以方向电流法为基础引入暂态能量偏离度(暂态值与正常值之比)共同构成故障识别判据,提出一种可准确辨识特高压直流输电整流侧出口故障、直流线路故障和逆变侧出口故障的方法。该识别方法对直流线路通信通道要求低、耐过渡电阻能力强、对采样频率的要求不高。通过在PSCAD中搭建±800 kV直流输电模型并结合Matlab仿真结果表明,该方法可实现直流输电系统故障的准确辨识,且能实现故障选极,具有一定的实际工程价值。
Identifying the faults of UHVDC transmission system reliably and accurately is the basis of protection action inside and outside the UHVDC transmission system,which is of decisive significance to safe and reliable operation of the whole HVDC transmission system.Based on the Berrellon distributed parameter model,a fault identification criterion is proposed by introducing the transient energy deviation(the ratio of transient value to normal value)on the basis of the directional current method,which can identify rectifier outlet fault,DC line fault and inverter outlet fault in UHVDC transmission accurately.This identification method has low requirement for DC line communication channel,strong ability of resisting transition resistance and low requirement for sampling frequency.By building the±800 kV DC transmission model in PSCAD and combining with the MATLAB,the simulation results show that the method can identify the faults of HVDC system accurately and select the fault poles,which has a certain practical engineering value.
Identifying the faults of UHVDC transmission system reliably and accurately is the basis of protection action inside and outside the UHVDC transmission system,which is of decisive significance to safe and reliable operation of the whole HVDC transmission system.Based on the Berrellon distributed parameter model,a fault identification criterion is proposed by introducing the transient energy deviation(the ratio of transient value to normal value)on the basis of the directional current method,which can identify rectifier outlet fault,DC line fault and inverter outlet fault in UHVDC transmission accurately.This identification method has low requirement for DC line communication channel,strong ability of resisting transition resistance and low requirement for sampling frequency.By building the±800 kV DC transmission model in PSCAD and combining with the MATLAB,the simulation results show that the method can identify the faults of HVDC system accurately and select the fault poles,which has a certain practical engineering value.
引文
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[2]张文亮,于永清,李光范,等.特高压直流技术研究[J].中国电机工程学报,2007,27(22):1-7.ZHANG Wenliang,YU Yongqing,LI Guangfan,et al.Research on UHVDC technology[J].Proceedings of the CSEE,2007,27(22):1-7.
[3]赵杰.高压直流输电的前沿技术[J].中国电力,2005,38(10):1-6.ZHAO Jie.Advanced technology of HVDC transmission[J].Electric Power,2005,38(10):1-6.
[4]饶宏,张东辉,赵晓斌,等.特高压直流输电的实践和分析[J].高电压技术,2015,41(8):2481-2488.RAO Hong,ZHANG Donghui,ZHAO Xiaobin,et al.Practice and analysis of UHVDC transmission[J].High Voltage Engineering,2015,41(8):2481-2488.
[5]姚雷.中国特高压直流输电技术不断跃升[N].国家电网报,2012-07-30(4).
[6]宋国兵,蔡新雷,高淑萍,等.高压直流输电线路故障定位研究综述[J].电力系统保护与控制,2012,40(5):133-137+147.SONG Guobing,CAI Xinlei,GAO Shuping,et al.Review of fault location in HVDC transmission lines[J].Power System Protection and Control,2012,40(5):133-137+147.
[7]束洪春,董俊,司大军,等.小波变换应用于暂态初始行波分析及故障选线选相[J].云南水力发电,2002(2):6-9,36.SHU Hongchun,DONG Jun,SI Dajun,et al.Wave transform applied to transient initial traveling wave analysis and fault line selection[J].Yunnan Hydropower,2002(2):6-9,36.
[8]宋国兵,褚旭,高淑萍,等.利用滤波器支路电流的高压直流输电线路全线速动保护[J].中国电机工程学报,2013,33(22):120-126.SONG Guobing,CHU Xu,GAO Shuping,et al.Use of filter branch current of high voltage DC transmission line across the board fast motion protection[J].Proceedings of the CSEE,2013,33(22):120-126.
[9]束洪春.直流输电线路雷击分析及保护测距[M].北京:科学出版社,2016,
[10]束洪春,王超,张杰,等.基于形态学的HVDC线路故障识别与定位方法研究[J].电力自动化设备,2007,27(4):6-9,18.SHU Hongchun,WANG Chao,ZHANG Jie,et al.Research on fault identification and location method of HVDC line based on morphology[J].Electric Power Automation Equipment,2007,27(4):6-9,18.
[11]赵中原,方志,邱毓昌,等.基于MATLAB/Simulink的高压直流输电系统仿真研究[J].中国电力,2002,35(6):55-58.ZHONG Zhongyuan,FANG Zhi,QIU Yuchang,et al.Simulation research of HVDC power transmission system based on MATLAB/Simulink[J].Electric Power,2002,35(6):55-58.
[12]贺家李.电力系统继电保护技术的现状与发展[J].中国电力,1999,32(10):40-42.HE Jiali.Status quo and development of relay protection technology in power system[J].Electric Power,1999,32(10):40-42.
[13]陈仕龙,曹蕊蕊,毕贵红,等.利用多分辨奇异谱熵和支持向量机的特高压直流输电线路区内外故障识别方法[J].电网技术,2015,39(4):989-994.CHEN Shilong,CAO Ruirui,BI Guihong,et al.A method to identify faults inside and outside the area of UHVDC power transmission lines using multiresolution singular spectral entropy and support vector machine[J].Power System Technology,2015,39(4):989-994.
[14]束洪春,田鑫萃,张广斌,等.±800 kV直流输电线路的极波暂态量保护[J].中国电机工程学报,2011,31(22):96-104.SHU Hongchun,TIAN Xincui,ZHANG Guangbin,et al.A wave±800 kV DC transient current protection transmission line[J].Proceedings of the CSEE,2011,31(22):96-104.