中低压馈线电气计算方法的误差分析和估算公式改进  

Error Analysis and Improvement of Voltage/Power Loss Estimation Formula for Middle and Low Voltage Feeders

作　　者：向婷婷[1] 王主丁[1] 刘雪莲[2] 王付卫 

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室,重庆大学,重庆市400044 [2]贵州省电网公司贵阳供电局,贵州省贵阳市550002 [3]云南省电网公司玉溪供电局,云南省玉溪市653100

出　　处：《电力系统自动化》2012年第19期105-109,共5页Automation of Electric Power Systems

基　　金：科技部科技型企业技术创新基金资助项目(06C26225110507)~~

摘　　要：中低压线路在实际电压损耗较大的情况下,采用损失系数法计算得到的功率损耗值和电压损耗值与实际值存在较大的差异。针对此问题,提出基于线路分段计算将线路分成N段,然后基于每一段的损耗,采用相关数学公式推导出段数趋于无穷时的线路新损耗估算公式。通过比较损失系数法、改进的损失系数法和有限元法3种方法在不同情况下的计算结果,验证了所提出的改进的损失系数法可使误差显著降低,尤其是对于线路上电压损耗大的情况。In the large voltage loss situation for middle and low voltage feeders,the power loss and voltage loss values calculated with the loss coefficient method are greatly different from their actual values.A line segment based method,i.e.improved loss coefficient method,for calculating the voltage and power loss is proposed to solve the problem mentioned above.By dividing a line into N segments,new loss estimation formulas are derived when the segment number tends to be infinite by using the related mathematical knowledge with the losses for each segment being obtained.By comparing the calculated results of three methods,i.e.loss coefficient method,improved loss coefficient method and finite element analysis,in different situations,it shows that the proposed improvement of loss coefficient method can greatly reduce the error,especially for the lines with large voltage loss.

关 键 词：中低压馈线 误差分析 损失系数法 功率损耗 电压损耗 

分 类 号：TM714.3[电气工程—电力系统及自动化]