基于多频带能量的高压直流输电线路单端暂态电流保护
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摘要
分析高压直流输电(High Voltage Direct Current,HVDC)线路边界和线路的频率特性,直流线路边界和直流线路对故障暂态电流信号高频分量都具有衰减作用。一些文献据此利用高频分量作为单端暂态保护的判据,但是对于长线路来说,直流线路对于高频分量的衰减可能会大于直流线路边界对高频分量的衰减作用,这样可能会造成保护误动作。进一步分析发现,直流线路边界对于低频分量具有放大作用,直流线路对于低频分量具有衰减作用。因此提出一种基于多频带能量的HVDC线路单端暂态电流保护新原理。利用0~1.25 k Hz低频带能量、高频带和低频带能量比来区分区内、区外短路故障,故障性雷击和非故障性雷击,利用正极和负极的能量比判别故障极。
The frequency characteristics of HVDC transmission line and line boundary are analyzed, the fault transient high-frequency current signal will be weakened through line boundary and DC line. The high-frequency components are used as a criterion for single ended transient protection in some literature, but for long lines, DC line for attenuation of high frequency components may be larger than line boundary, which may cause malfunction protection. Further analysis shows that physical boundary has an amplification effect on low frequency components, and DC line has an attenuation effect on low frequency components. Based on multiband energy, a new principle of single ended transient current protection for HVDC transmission line is proposed. The identification criterion of internal and external faults, lightning stroke fault and non lightning stroke fault are based on the energy of 0~1.25 k Hz low frequency, energy ratio of high frequency and low frequency, the fault line is selected by the energy ratio of the two lines.
The frequency characteristics of HVDC transmission line and line boundary are analyzed, the fault transient high-frequency current signal will be weakened through line boundary and DC line. The high-frequency components are used as a criterion for single ended transient protection in some literature, but for long lines, DC line for attenuation of high frequency components may be larger than line boundary, which may cause malfunction protection. Further analysis shows that physical boundary has an amplification effect on low frequency components, and DC line has an attenuation effect on low frequency components. Based on multiband energy, a new principle of single ended transient current protection for HVDC transmission line is proposed. The identification criterion of internal and external faults, lightning stroke fault and non lightning stroke fault are based on the energy of 0~1.25 k Hz low frequency, energy ratio of high frequency and low frequency, the fault line is selected by the energy ratio of the two lines.
引文
[1]于洋,孙学锋,高鹏,等.高压直流输电线路暂态保护分析与展望[J].电力系统保护与控制,2015,43(2):148-154.YU Yang,SUN Xuefeng,GAO Peng,et al.Analysis and prospect on transient protection for HVDC transmission lines[J].Power System Protection and Control,2015,43(2):148-154.
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[3]邢鲁华.高压直流输电线路保护与故障测距原理研究[D].济南:山东大学,2014.XING Luhua.Research on protection and fault location principles for HVDC transmission lines[D].Jinan:Shandong University,2014.
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[5]李豹,马业林,熊双成,等.±800 k V特高压直流保护优化研究[J].电力系统保护与控制,2014,42(16):71-75.LI Bao,MA Yelin,XIONG Shuangcheng,et al.Research on optimization of±800 k V UHVDC protection[J].Power System Protection and Control,2014,42(16):71-75.
[6]高本锋,张学伟,刘辛晔,等.高压直流输电保护定值整定流程的研究[J].电工技术学报,2015,30(12):400-407.GAO Benfeng,ZHANG Xuewei,LIU Xinye,et al.Research of HVDC Protection Value Setting Process[J].Transactions of China Electrotechnical Society,2015,30(12):400-407.
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[8]方达意.基于暂态电流小波能量谱的超高压输电线路故障类型识别[D].长沙:湖南大学,2009.FANG Dayi.Transient current's energy spectrum-based faulty type identification method in EHV lines[D].Changsha:Hunan University,2009.
[9]束洪春,刘可真,朱盛强.±800 k V特高压直流输电线路单端电气量暂态保护[J].中国电机工程学报,2010,30(31):108-117.SHU Hongchun,LIU Kezhen,ZHU Shengqiang.±800 k V UHVDC transmission line protection based on single end electrical transient signal[J].Proceedings of the CSEE,2010,30(31):108-117.
[10]刘可真,束洪春,于继来.±800 k V特高压直流输电线路雷击暂态识别[J].电网技术,2013,37(11):3008-3014.LIU Kezhen,SHU Hongchun,YU Jilai.Transient identification of lightning strokes on±800 k V UHVDC transmission lines[J].Power System Technology,2013,37(11):3008-3014.
[11]杨帅雄.基于故障暂态分量的高压输电线路继电保护方法研究[D].长沙:湖南大学,2011.YANG Shuaixiong.Research of high-voltage transmission line relaying based on the fault transient components[D].Changsha:Hunan University,2011.
[12]蒋洪涛,黄纯,杨帅雄.基于小波暂态能量的超高压输电线路保护新方法[J].电网技术,2012,36(8):248-253.JIANG Hongtao,HUANG Chun,YANG Shuaixiong.A new protection approach for EHV transmission lines based on wavelet transient energy[J].Power System Technology,2012,36(8):248-253.
[13]陈仕龙,束洪春,万春红,等.一种特高压直流输电线路单端电压暂态保护原理[J].电力系统保护与控制,2013,41(3):26-31.CHEN Shilong,SHU Hongchun,WAN Chunhong,et al.The principle of single-ended transient based voltage protection for UHVDC transmission line[J].Power System Protection and Control,2013,41(3):26-31.
[14]陈仕龙,束洪春,叶波,等.云广±800 k V特高压直流输电系统精确建模及仿真[J].昆明理工大学学报(自然科学版),2012,37(2):43-48.CHEN Shilong,SHU Hongchun,YE Bo,et al.Accurate modeling and simulation of Yunnan-Guangdong±800k V UHVDC transmission system[J].Journal of Kunming University of Science and Technology(Natural Science Edition),2012,37(2):43-48.
[15]陈仕龙,束洪春,谢静,等.特高压直流输电线路和边界频率特性研究[J].电力自动化设备,2013,33(11):134-153.CHEN Shilong,SHU Hongchun,XIE Jing,et al.Frequency characteristics of UHVDC transmission line and its boundary[J].Electric Power Automation Equipment,2013,33(11):134-153.
[16]陈仕龙,谢佳伟,毕贵红,等.一种特高压直流输电线路神经网络双端故障测距新方法[J].电工技术学报,2015,30(4):257-264.CHEN Shilong,XIE Jiawei,BI Guihong,et al.A novel two terminal fault location method used ANN for UHVDC transmission line[J].Transactions of China Electrotechnical Society,2015,30(4):257-264.
[17]王钢,李海锋,赵建仓,等.基于小波多尺度分析的输电线路直击雷暂态识别[J].中国电机工程学报,2004,24(4):139-144.WANG Gang,LI Haifeng,ZHAO Jiancang,et al.Identification of transients on transmission lines caused by direct lightning strokes based on multiresolution signal decomposition[J].Proceedings of the CSEE,2004,24(4):139-144.
[2]董鑫.高压直流输电线路行波保护的研究[D].长春:东北电力大学,2008.DONG Xin.Research on theory of traveling wave protection of HVDC lines[D].Changchun:North Dianli University,2008.
[3]邢鲁华.高压直流输电线路保护与故障测距原理研究[D].济南:山东大学,2014.XING Luhua.Research on protection and fault location principles for HVDC transmission lines[D].Jinan:Shandong University,2014.
[4]姚致清,刘涛,张爱玲,等.直流融冰技术的研究及应用[J].电力系统保护与控制,2010,38(21):57-62.YAO Zhiqing,LIU Tao,ZHANG Ailing,et al.Research&application on DC de-icing technology[J].Power System Protection and Control,2010,38(21):57-62.
[5]李豹,马业林,熊双成,等.±800 k V特高压直流保护优化研究[J].电力系统保护与控制,2014,42(16):71-75.LI Bao,MA Yelin,XIONG Shuangcheng,et al.Research on optimization of±800 k V UHVDC protection[J].Power System Protection and Control,2014,42(16):71-75.
[6]高本锋,张学伟,刘辛晔,等.高压直流输电保护定值整定流程的研究[J].电工技术学报,2015,30(12):400-407.GAO Benfeng,ZHANG Xuewei,LIU Xinye,et al.Research of HVDC Protection Value Setting Process[J].Transactions of China Electrotechnical Society,2015,30(12):400-407.
[7]刘剑,范春菊,邰能灵.考虑直流控制系统影响的HVDC输电线路后备保护研究[J].电力系统保护与控制,2015,43(1):73-80.LIU Jian,FAN Chunju,TAI Nengling.Backup protection research for HVDC transmission line considering the impact of DC control system[J].Power System Protection and Control,2015,43(1):73-80.
[8]方达意.基于暂态电流小波能量谱的超高压输电线路故障类型识别[D].长沙:湖南大学,2009.FANG Dayi.Transient current's energy spectrum-based faulty type identification method in EHV lines[D].Changsha:Hunan University,2009.
[9]束洪春,刘可真,朱盛强.±800 k V特高压直流输电线路单端电气量暂态保护[J].中国电机工程学报,2010,30(31):108-117.SHU Hongchun,LIU Kezhen,ZHU Shengqiang.±800 k V UHVDC transmission line protection based on single end electrical transient signal[J].Proceedings of the CSEE,2010,30(31):108-117.
[10]刘可真,束洪春,于继来.±800 k V特高压直流输电线路雷击暂态识别[J].电网技术,2013,37(11):3008-3014.LIU Kezhen,SHU Hongchun,YU Jilai.Transient identification of lightning strokes on±800 k V UHVDC transmission lines[J].Power System Technology,2013,37(11):3008-3014.
[11]杨帅雄.基于故障暂态分量的高压输电线路继电保护方法研究[D].长沙:湖南大学,2011.YANG Shuaixiong.Research of high-voltage transmission line relaying based on the fault transient components[D].Changsha:Hunan University,2011.
[12]蒋洪涛,黄纯,杨帅雄.基于小波暂态能量的超高压输电线路保护新方法[J].电网技术,2012,36(8):248-253.JIANG Hongtao,HUANG Chun,YANG Shuaixiong.A new protection approach for EHV transmission lines based on wavelet transient energy[J].Power System Technology,2012,36(8):248-253.
[13]陈仕龙,束洪春,万春红,等.一种特高压直流输电线路单端电压暂态保护原理[J].电力系统保护与控制,2013,41(3):26-31.CHEN Shilong,SHU Hongchun,WAN Chunhong,et al.The principle of single-ended transient based voltage protection for UHVDC transmission line[J].Power System Protection and Control,2013,41(3):26-31.
[14]陈仕龙,束洪春,叶波,等.云广±800 k V特高压直流输电系统精确建模及仿真[J].昆明理工大学学报(自然科学版),2012,37(2):43-48.CHEN Shilong,SHU Hongchun,YE Bo,et al.Accurate modeling and simulation of Yunnan-Guangdong±800k V UHVDC transmission system[J].Journal of Kunming University of Science and Technology(Natural Science Edition),2012,37(2):43-48.
[15]陈仕龙,束洪春,谢静,等.特高压直流输电线路和边界频率特性研究[J].电力自动化设备,2013,33(11):134-153.CHEN Shilong,SHU Hongchun,XIE Jing,et al.Frequency characteristics of UHVDC transmission line and its boundary[J].Electric Power Automation Equipment,2013,33(11):134-153.
[16]陈仕龙,谢佳伟,毕贵红,等.一种特高压直流输电线路神经网络双端故障测距新方法[J].电工技术学报,2015,30(4):257-264.CHEN Shilong,XIE Jiawei,BI Guihong,et al.A novel two terminal fault location method used ANN for UHVDC transmission line[J].Transactions of China Electrotechnical Society,2015,30(4):257-264.
[17]王钢,李海锋,赵建仓,等.基于小波多尺度分析的输电线路直击雷暂态识别[J].中国电机工程学报,2004,24(4):139-144.WANG Gang,LI Haifeng,ZHAO Jiancang,et al.Identification of transients on transmission lines caused by direct lightning strokes based on multiresolution signal decomposition[J].Proceedings of the CSEE,2004,24(4):139-144.