基于瞬时三相不平衡度的低压电网线损理论计算

Low-Voltage Distribution Network Theoretical Energy Loss Calculation Based on Real-Time Unbalance in Three Phrases

考虑了三相不平衡度对低压线损的影响,采用实时的三相不平衡系数,以等值电阻法为基础改进了低压线路损耗的计算方法。针对大部分低压台区未安装负荷测试仪,无法采集到代表日整点电流数据的特点,提出了基于负荷分类曲线叠加以确定瞬时三相不平衡度的方法。利用某一台区的电量数据对改进算法进行了计算,并与传统算法的计算结果进行了比较。算例结果表明,该算法可行,且其计算结果更逼近线损的真实值。

In considering the effect of three-phase unbalance degree upon the low voltage line loss, the real-time three-phase unbalance coefficient is adopted to improve the computation method for low-voltage line loss based on equal electric resistance method in this paper. With an aim at the most of low-voltage network without loading measurement meter installed so that there is no way to collect the representative daily current data, this paper suggests a method to determine the instance three-phase unbalance degree based on loading classification curve overlay. The electricity data in a certain transformer district is used to test the improved computing method, and to compare the results obtained from the traditional computing method. The results from computing examples indicate that this computing method is feasible, with the calculated results nearing to real value of line loss.