特高压直流接地极线路雷击闪络风险研究
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摘要
接地极线路的安全稳定运行对整个特高压直流输电系统的可靠性有重要影响。针对目前接地极线路绝缘配合存在的问题,开展了招弧角雷击闪络试验,获取了间隙距离与雷击50%闪络电压的关系;建立了基于蒙特卡洛法的接地极线路的雷击闪络率计算模型,分析了主要影响因素。结果表明:目前我国的接地极线路绝缘强度较低,招弧角的存在,增大了雷击闪络风险;接地极线路的雷击闪络率与雷电流幅值概率分布和招弧角间隙距离密切相关,在进行绝缘配合设计时需考虑感应雷过电压。
Safe and stable operation of electrode line is important to the reliability of the UHVDC transmission system. In order to improve the insulation coordination defects of UHVDC electrode line,the relationship between the 50% lightning impulse breakdown voltages and the different gap distances was obtained through arcing horns lightning flashover experiments. Also, A model for calculating lightning flashover rate of electrode line based on Monte Carlo method was established, and the main impact factors of the lightning flashover rate were analyzed. Results show that: 1)The dielectric strength of UHVDC electrode line currently operating in China is low. The arcing horns has increasing the lightning flashover risk. 2)Lightning flashover rate of the electrode line is closely related to the probability distribution of lightning current amplitude and gap distance of arcing horns. Lighting induced overvoltage should be considered in insulation coordination design of UHVDC electrode line.
Safe and stable operation of electrode line is important to the reliability of the UHVDC transmission system. In order to improve the insulation coordination defects of UHVDC electrode line,the relationship between the 50% lightning impulse breakdown voltages and the different gap distances was obtained through arcing horns lightning flashover experiments. Also, A model for calculating lightning flashover rate of electrode line based on Monte Carlo method was established, and the main impact factors of the lightning flashover rate were analyzed. Results show that: 1)The dielectric strength of UHVDC electrode line currently operating in China is low. The arcing horns has increasing the lightning flashover risk. 2)Lightning flashover rate of the electrode line is closely related to the probability distribution of lightning current amplitude and gap distance of arcing horns. Lighting induced overvoltage should be considered in insulation coordination design of UHVDC electrode line.
引文
[1]赵畹君.高压直流输电工程技术[M].北京:中国电力出版社,2004.
[2]王彪,王渝红,丁理杰,等.高压直流输电接地电极及相关问题综述[J].电力系统及其自动化学报,2012,24(1):66-72.WANG Biao,WANG Yuhong,DING Lijie,et al.Summary of HVDC grounding electrode and related issues[J].Proceedings of the Chinese Society of Universities,2012,24(1):66-72.
[3]赵杰,何金良.特高压和高压直流输电系统共用接地极模式分析[J].中国电力,2007,40(10):45-47.ZHAO Jie,HE Jinliang.Analysis on the common grounding electrode mode for UHVDC and HVDC power transmission systems[J].Electric Power,2007,40(10):45-47.
[4]张劲松.高压直流输电共用接地极主要设计原则[J].中国电力,2007,40(6):48-50.ZHANG Jinsong.Main design fundamentals for common earth electrodes in HVDC[J].Electric Power,2007,40(6):48-50.
[5]张冯硕,吴高波,李健,等.特高压直流接地极线路绝缘配合研究[J].电力建设,2015,36(2):86-90.ZHANG Fengshuo,WU Gaobo,LI Jian,et al.Insulation coordination for UHVDC electrode line[J].Electric Power Construction,2015,36(2):86-90.
[6]陈灿旭,刘茂涛,宋述波.±800 kV云广直流“12.15”事故原因分析及防范措施[J].电力系统自动化,2013,37(23):125-129.CHEN Canxu,LIU Maotao,SONG Shubo.Cause analysis and countermeasures of decemer 15,2012 accident in±800 kV Yunnan Guangdong DC transmission project[J].Automation of Electric Power Systems,2013,37(23):125-129.
[7]国家能源局.DL/T 5224—2014高压直流输电大地返回系统设计技术规程[S].北京:中国电力出版社,2014.
[8]杨光,朱韬析,魏丽君,等.直流输电系统接地极线路故障研究[J].电力系统保护与控制,2009,37(21):45-49.YANG Guang,ZHU Taoxi,WEI Lijun,et al.Research on the faults of electrode line of HVDC transmission system in monopolar ground return operation[J].Power System Protection and Control,2009,37(21):45-49.
[9]郑扬亮,冉学彬,刘更生.直流输电接地极线路招弧角有关问题的分析[J].高电压技术,2008,34(7):1513-1516.ZHENG Yangliang,RAN Xuebin,LIU Gengsheng.Investigation on arcing horns issue of HVDC electrode lines[J].High Voltage Engineering,2008,34(7):1513-1516.
[10]严璋,朱德恒.高电压绝缘技术[M].北京:中国电力出版社,2002.
[11]朱韬析,何方,何烨勇,等.南方电网直流输电系统接地极线路不平衡保护动作后果探讨[J].电力系统保护与控制,2009,37(15):112-116.ZHU Taoxi,HE Fang,HE Yeyong,et al.Disscusion on operation results of electrode current unbalanced protection used in HVDC transmission system in CSG[J].Power System Protection and Control,2009,37(15):112-116.
[12]电力工业部电力科学研究院高压研究所.DL/T620—1997交流电气装置的过电压保护和绝缘配合[S].北京:中国电力出版社,1997.
[13]彭崑,王志华.220 kV变电站自动化系统直流高阻接地问题分析与处理[J].电网与清洁能源,2015,31(2):43-47.PENG Kun,WANG Zhihua.DC high-impedance grounding in the automation system of the 220 kV substation[J].Power System and Clean Energy,2015,31(2):43-47.
[14]张明光,袁斌华.基于电压补偿原理的高压直流输电系统故障控制策略[J].电网与清洁能源,2015,31(3):1-5.ZHANG Mingguang,YUAN Binhua.A fault control strategy of HVDC transmission system based on voltage compensation principle[J].Power System and Clean Energy,2015,31(3):1-5.
[2]王彪,王渝红,丁理杰,等.高压直流输电接地电极及相关问题综述[J].电力系统及其自动化学报,2012,24(1):66-72.WANG Biao,WANG Yuhong,DING Lijie,et al.Summary of HVDC grounding electrode and related issues[J].Proceedings of the Chinese Society of Universities,2012,24(1):66-72.
[3]赵杰,何金良.特高压和高压直流输电系统共用接地极模式分析[J].中国电力,2007,40(10):45-47.ZHAO Jie,HE Jinliang.Analysis on the common grounding electrode mode for UHVDC and HVDC power transmission systems[J].Electric Power,2007,40(10):45-47.
[4]张劲松.高压直流输电共用接地极主要设计原则[J].中国电力,2007,40(6):48-50.ZHANG Jinsong.Main design fundamentals for common earth electrodes in HVDC[J].Electric Power,2007,40(6):48-50.
[5]张冯硕,吴高波,李健,等.特高压直流接地极线路绝缘配合研究[J].电力建设,2015,36(2):86-90.ZHANG Fengshuo,WU Gaobo,LI Jian,et al.Insulation coordination for UHVDC electrode line[J].Electric Power Construction,2015,36(2):86-90.
[6]陈灿旭,刘茂涛,宋述波.±800 kV云广直流“12.15”事故原因分析及防范措施[J].电力系统自动化,2013,37(23):125-129.CHEN Canxu,LIU Maotao,SONG Shubo.Cause analysis and countermeasures of decemer 15,2012 accident in±800 kV Yunnan Guangdong DC transmission project[J].Automation of Electric Power Systems,2013,37(23):125-129.
[7]国家能源局.DL/T 5224—2014高压直流输电大地返回系统设计技术规程[S].北京:中国电力出版社,2014.
[8]杨光,朱韬析,魏丽君,等.直流输电系统接地极线路故障研究[J].电力系统保护与控制,2009,37(21):45-49.YANG Guang,ZHU Taoxi,WEI Lijun,et al.Research on the faults of electrode line of HVDC transmission system in monopolar ground return operation[J].Power System Protection and Control,2009,37(21):45-49.
[9]郑扬亮,冉学彬,刘更生.直流输电接地极线路招弧角有关问题的分析[J].高电压技术,2008,34(7):1513-1516.ZHENG Yangliang,RAN Xuebin,LIU Gengsheng.Investigation on arcing horns issue of HVDC electrode lines[J].High Voltage Engineering,2008,34(7):1513-1516.
[10]严璋,朱德恒.高电压绝缘技术[M].北京:中国电力出版社,2002.
[11]朱韬析,何方,何烨勇,等.南方电网直流输电系统接地极线路不平衡保护动作后果探讨[J].电力系统保护与控制,2009,37(15):112-116.ZHU Taoxi,HE Fang,HE Yeyong,et al.Disscusion on operation results of electrode current unbalanced protection used in HVDC transmission system in CSG[J].Power System Protection and Control,2009,37(15):112-116.
[12]电力工业部电力科学研究院高压研究所.DL/T620—1997交流电气装置的过电压保护和绝缘配合[S].北京:中国电力出版社,1997.
[13]彭崑,王志华.220 kV变电站自动化系统直流高阻接地问题分析与处理[J].电网与清洁能源,2015,31(2):43-47.PENG Kun,WANG Zhihua.DC high-impedance grounding in the automation system of the 220 kV substation[J].Power System and Clean Energy,2015,31(2):43-47.
[14]张明光,袁斌华.基于电压补偿原理的高压直流输电系统故障控制策略[J].电网与清洁能源,2015,31(3):1-5.ZHANG Mingguang,YUAN Binhua.A fault control strategy of HVDC transmission system based on voltage compensation principle[J].Power System and Clean Energy,2015,31(3):1-5.