摘要
在对特高压交流同塔双回输电线路损耗特性进行研究时,需计算输电线路损耗值,传统方法需通过实测方式获取输电线路损耗值,而受到压等级和导线方式的影响,当前还没有有效的实测方法,实现困难。为此,提出一种新的基于电晕损耗计算的特高压交流同塔双回输电线路损耗特性研究方法,对某地区双回1 000 kV和双回500 kV特高压交流同塔双回输电线路进行研究。采用π型等效电路对输电线路进行描述,依据电路分析结果对输电线路电阻损耗进行计算。依据不同天气下电晕损耗计算原则,在采集大量实验数据的基础上,提出一定范围内输电线路单位长度电晕损耗计算公式。研究不同天气环境、输送量、输送距离、负载率对输电线路损耗的影响,得出以下结论:4分裂导线单位长度电晕损耗低于8分裂导线;下雨情况下电晕损耗显著高于干燥情况下的电晕损耗;输电线路损耗率随输送量无显著变化,随输送距离的增加而增加,随负载的增加而增加,1 000 kV输电线路损耗率随复杂率的涨幅比500 kV输电线路低,优势高。
In the research of ultra high voltage(UHV)alternating current(AC)double circuit transmission line loss characteristics,calculation of transmission line loss value,the traditional method to obtain the transmission line loss value measured by the way,affected by the pressure level and wire mode,there is no real effective method,difficult to implement.Therefore,a new method for studying the loss characteristics of UHV AC dual circuit transmission lines based on corona loss calculation is proposed.The two back 1 000 kV and double back 500 kV UHV AC transmission lines of the same tower are studied in a certain area.The transmission line is described by the equivalent circuit of the pion type,and the resistance loss of the transmission line is calculated according to the results of the circuit analysis.Based on the calculation principle of corona loss under different weather conditions,based on a large number of experimental data,a formula for calculating the corona loss of unit length of transmission line is proposed within a certain range.The influence of different weather environment,transportation amount,transport distance and load rate on transmission line loss is studied.Conclusions are as following:4 conductor corona loss less than 8 per unit length of conductor corona loss under the condition of rain;corona loss is significantly higher than that under dry condition;transmission line loss rate with the delivery volume has no significant change,increases with the increase of transmission distance,increases with the load increase,1 000 kV transmission line loss rate with complex the rate of increase than the 500 kV transmission line is low,with high advantages.
作者
赵光锋
李欣唐
聂钢
刘书娥
ZHAO Guang-feng;LI Xin-tang;NIE Gang;LIU Shu-e(State Grid Shandong Electric Power Company,Jinan 250000,China;School of Electrical Engineering,Shandong University,Jinan 250000,China;Shandong Shanda Electric Power Technology Co.Ltd.,Jinan 250101,China)
出处
《科学技术与工程》
北大核心
2018年第30期177-182,共6页
Science Technology and Engineering
关键词
特高压交流
同塔
双回输电线路
损耗特性
ultra high voltage alternating current
the same tower
double circuit transmission line
