基于无损传输线理论的特高压线路稳态过电压装置需求判别  

A Method to Judge Demand of UHV Transmission Lines on Steady-State Over-voltage Device Based on Lossless Transmission Line Theory

作　　者：唐晓骏[1] 付红军[2] 胡扬宇[2] 孟远景[2] 刘东冉[1] 秦晓辉[1] 张文朝[1] 马世英[1] 刘楠[1] 

机构地区：[1]中国电力科学研究院,北京市海淀区100192 [2]河南电力调度通信中心,河南省郑州市450007

出　　处：《电网技术》2011年第2期1-6,共6页Power System Technology

摘　　要：利用无损传输线理论建立了特高压线路空充时沿线电压分布公式,综合考虑了特高压线路参数和甩空侧高抗配置,得到了不同合空侧电压下特高压线路的极限长度。在合空侧电压相同情况下,若特高压线路实际长度超过极限长度,则必须配置稳态过电压装置,避免特高压线路空充时沿线电压超过1 100 kV。该方法克服了现有判断方法完全依赖电力系统模拟软件进行大量繁琐仿真的问题,用PSD-BPA电力系统仿真软件的计算结果表明,该方法计算结果准确可靠,具有较高的应用价值。Based on lossless transmission line theory, a formula to calculate the voltage distribution along ultra high voltage （UHV） transmission line, which is connected to power grid under no-load condition, is derived. During the derivation of the formula, the parameters of UHV transmission line and configuration of high voltage reactor in disconnected no-load transmission line are comprehensively considered, and the extreme length of UHV transmission line under different grid voltage connected to no-load UHV transmission line. Under the same voltage connected to no-load UHV transmission line, if actual length of UHV transmission line exceeds the extreme length, it is necessary to configure steady-state overvoltage device to avoid such a condition that ＇the voltage along the connected no-load UHV transmission line exceeds 1000kV. The proposed method remedy the defect of exising judging methods that depend on power system simulation software and a lot of simulations have to performed. Comparison of the judged result by the proposed method with the result from PSD-BPA simulation software shows that the proposed method can give accurate and reliable result.

关 键 词：稳态过电压 传输线理论 特高压线路兰 

分 类 号：TM86[电气工程—高电压与绝缘技术]