基于负荷分类的台区线损测算方法

以低压供电台区线路损耗的计算为目的,对传统低压线损计算方法的误差及可行性进行了分析,在此基础上,提出了通过分类负荷曲线叠加确定电流方差,进而利用考核期内运行参数(实抄电量)确定线损指标的新方法,该方法针对低压供电台区用户的负荷特点,将其分为3种类型,实测3类用户的典型负荷曲线,利用3类用户的典型负荷曲线和售电量,合成低压配变出口待测月的负荷曲线,最后得到持续电流负荷曲线,进而计算电流方差。这样提高了等效功率法中电流方差的计算精度,使得该方法计算的台区线损比传统方法精度要高,基本满足台区线损指标要求。文中利用一台区的电量数据对所提方法进行了测试,并与传统方法的计算结果进行了比较,算例表明所提方法可行,具有较强的工程实用价值。

Method for Calculating Transformer District Line Loss Based on Load Classification

This paper presents a new method for calculating line loss in low voltage transformer districts based on load classification.This method calculates the current variance by superimposing classified load curves and further calculates the line loss index by parameters(electricity consumption reading) in examined days based on the analysis of errors and feasibility of the traditional methods of the low voltage line loss calculation.According to the load characteristics in low voltage transformer districts,this method classifies the loads into three types and obtains the transformer load curve by composing the typical load curve and electric supplies of these three types of loads,and eventually obtains the durative current curve.This method improved the accuracy of line loss calculation by improving the accuracy of current variance calculation.The proposed method has been verified using the electricity data in a transformer district.It has been convinced that this method is more accurate than the traditional method and can substantially meet the requirement of calculation of the line loss index in transformer district and has high potential values in engineering applications.