输电线路风偏放电风险分析与预警方法
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摘要
风偏跳闸是造成电网运行故障的主要原因之一,严重影响输电线路稳定运行。为了有效预警输电线路风偏跳闸,本文提出基于天气预报的风偏闪络预警模型。首先根据天气预报建立气象样本集,随机抽取风速风向值,采用引入脉动放大系数和高差修正系数修正后的刚性直棒法,分别计算直线塔悬垂绝缘子串和跳线绝缘子串的风偏角,然后依据输电塔和绝缘子串参数计算导线杆塔最小空气间隙,引入降雨折减系数对最小空气间隙进行修正,最后与规程规定允许最小间隙对比,重复抽样计算得出预警概率。通过实例验证预警模型的可行性和精确性。
Windage yaw flashover is one of the main causes of power grid operation failure,which seriously affects the stable operation of transmission lines. In order to effectively predict the windage yaw flashover of transmission lines,a windage yaw flashover warning model based on weather forecast is proposed in this paper. First,we set up a meteorological sample set according to weather forecast and randomly select wind speed and wind direction,and calculate the windage yaw angles of the suspended insulator strings and the insulator strings of jumpers respectively by using the rigid bar method corrected by the pulse amplification factor and the correction coefficient of height difference.Then we calculate the minimum air gap between transmission wire and tower according to the parameters of transmission tower and insulator string,and this gap is corrected by introducing the rainfall reduction factor. Finally,contrasting the minimum air gap with the regulations,the probability of early warning is obtained by repeated sampling and calculating. At last,the feasibility and accuracy of early warning model are verified by examples.
Windage yaw flashover is one of the main causes of power grid operation failure,which seriously affects the stable operation of transmission lines. In order to effectively predict the windage yaw flashover of transmission lines,a windage yaw flashover warning model based on weather forecast is proposed in this paper. First,we set up a meteorological sample set according to weather forecast and randomly select wind speed and wind direction,and calculate the windage yaw angles of the suspended insulator strings and the insulator strings of jumpers respectively by using the rigid bar method corrected by the pulse amplification factor and the correction coefficient of height difference.Then we calculate the minimum air gap between transmission wire and tower according to the parameters of transmission tower and insulator string,and this gap is corrected by introducing the rainfall reduction factor. Finally,contrasting the minimum air gap with the regulations,the probability of early warning is obtained by repeated sampling and calculating. At last,the feasibility and accuracy of early warning model are verified by examples.
引文
[1]王天宇.特高压V型绝缘子串风偏研究[D].武汉:华中科技大学,2015.
[2]刘小会,严波,林雪松,等.500kV超高压输电线路风偏数值模拟研究[J].工程力学,2009,26(1):244-249.
[3]张禹芳.我国500kV输电线路风偏闪络分析[J].电网技术,2005,29(7):65-67.
[4]胡毅.输电线路运行故障的分析与防治[J].高电压技术,2007,33(3):1-8.
[5]肖林海.特高压悬垂绝缘子串的风偏特性[D].武汉:华中科技大学,2013.
[6]熊小伏,翁世杰,王建,等.考虑降雨修正的干字型耐张塔跳线风偏放电在线预警方法[J].电力系统保护与控制,2015,43(5):136-143.
[7]杨恒,王伟,张宗钰,等.输电线路风偏闪络风险评估模型研究[J].贵州电力技术,2015,(11):72-75.
[8]郭志民,王伟,李哲,等.强对流天气下输电线路多因素风险动态评估方法[J].电网技术,2017,(11):3598-3608.
[9]王海涛,谷山强,吴大伟,等.基于数值天气预报的输电线路风偏闪络预警方法[J].电力系统保护与控制,2017,45(12):121-127.
[10]蒋乐,刘俊勇,魏震波,等.基于马尔可夫链模型的输电线路运行状态及其风险评估[J].电力系统自动化,2015,39(13):51-57.
[11]李震宇,武国亮,王志利,等.电力微气象风偏灾害监测预警技术及系统实现[J].电力系统保护与控制,2017,45(1):125-131.
[12]侯淑梅,张少林,盛春岩,等.T639数值预报产品对黄渤海沿海大风预报效果检验[J].海洋预报,2014,(6):48-56.
[13]吴曼丽,王瀛,袁子鹏,等.基于自动站资料的海上风客观预报方法[J].气象与环境学报,2013,(1):84-88.
[14]李黎,肖林海,罗先国,等.特高压绝缘子串的风偏计算方法[J].高电压技术,2013,39(12):2924-2932.
[15]GB 50665-2011,1000 k V架空输电线路设计规范[S].
[16]GB 50545-2010,110 k V~750 k V架空输电线路设计规范[S].
[17]耿翠英,魏丹,何熹.浅谈降雨对工频闪络电压的影响[J].高压电器,2010,46(1):103-105.
[18]耿翠英,陈守聚,刘莘昱,等.降雨对空气间隙工频闪络电压影响的试验研究[J].高压电器,2009,(1):36-39.
[19]邵天晓.架空送电线路的电线力学计算(第2版)[M].北京:中国电力出版社,2003.
[20]张殿生.电力工程高压送电线路设计手册(第2版)[M].北京:中国电力出版社,2003.
[2]刘小会,严波,林雪松,等.500kV超高压输电线路风偏数值模拟研究[J].工程力学,2009,26(1):244-249.
[3]张禹芳.我国500kV输电线路风偏闪络分析[J].电网技术,2005,29(7):65-67.
[4]胡毅.输电线路运行故障的分析与防治[J].高电压技术,2007,33(3):1-8.
[5]肖林海.特高压悬垂绝缘子串的风偏特性[D].武汉:华中科技大学,2013.
[6]熊小伏,翁世杰,王建,等.考虑降雨修正的干字型耐张塔跳线风偏放电在线预警方法[J].电力系统保护与控制,2015,43(5):136-143.
[7]杨恒,王伟,张宗钰,等.输电线路风偏闪络风险评估模型研究[J].贵州电力技术,2015,(11):72-75.
[8]郭志民,王伟,李哲,等.强对流天气下输电线路多因素风险动态评估方法[J].电网技术,2017,(11):3598-3608.
[9]王海涛,谷山强,吴大伟,等.基于数值天气预报的输电线路风偏闪络预警方法[J].电力系统保护与控制,2017,45(12):121-127.
[10]蒋乐,刘俊勇,魏震波,等.基于马尔可夫链模型的输电线路运行状态及其风险评估[J].电力系统自动化,2015,39(13):51-57.
[11]李震宇,武国亮,王志利,等.电力微气象风偏灾害监测预警技术及系统实现[J].电力系统保护与控制,2017,45(1):125-131.
[12]侯淑梅,张少林,盛春岩,等.T639数值预报产品对黄渤海沿海大风预报效果检验[J].海洋预报,2014,(6):48-56.
[13]吴曼丽,王瀛,袁子鹏,等.基于自动站资料的海上风客观预报方法[J].气象与环境学报,2013,(1):84-88.
[14]李黎,肖林海,罗先国,等.特高压绝缘子串的风偏计算方法[J].高电压技术,2013,39(12):2924-2932.
[15]GB 50665-2011,1000 k V架空输电线路设计规范[S].
[16]GB 50545-2010,110 k V~750 k V架空输电线路设计规范[S].
[17]耿翠英,魏丹,何熹.浅谈降雨对工频闪络电压的影响[J].高压电器,2010,46(1):103-105.
[18]耿翠英,陈守聚,刘莘昱,等.降雨对空气间隙工频闪络电压影响的试验研究[J].高压电器,2009,(1):36-39.
[19]邵天晓.架空送电线路的电线力学计算(第2版)[M].北京:中国电力出版社,2003.
[20]张殿生.电力工程高压送电线路设计手册(第2版)[M].北京:中国电力出版社,2003.