基于等效负荷分布的含分布式电源配电网线损计算  

Calculation of line loss in distribution networks with distributed power sources based on equivalent load distribution

作　　者：李乐萍 许皓 王予希 刘希峰 吕春晖 张利[2] LI Leping;XU Hao;WANG Yuxi;LIU Xifeng;LÜChunhui;ZHANG Li(Liaocheng Power Supply Company State Grid Shandong Electric Power Company,Liaocheng 252000,China;Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education(Shandong University),Jinan 250012,China)

机构地区：[1]国网山东省电力公司聊城供电公司,山东聊城252000 [2]电网智能化调度与控制教育部重点实验室(山东大学),山东济南250012

出　　处：《供用电》2024年第3期42-50,77,共10页Distribution & Utilization

基　　金：国家基金委联合基金项目“双碳目标下计及高密度能源有序转化的多元能流互动耦合关键技术及工程平台研究”(U22B20102-1);国网山东省电力公司科技项目“基于多维线损评价体系的电网线损精确分析和降损策略研究”(520611210005)。

摘　　要：分布式可再生电源的大量接入造成配电线路潮流波动频繁,给评估配电网的理论线损带来极大挑战。针对这一问题,提出一种基于等效负荷分布的配电网理论线损计算方法。将分布式电源发电波动与负荷波动合并为净负荷考虑,并结合线路参数分布的不均匀性定义了等效负荷分布,基于等面积法则建立了等效负荷分布曲线的求取方法;以等效负荷分布为主要输入特征,并计及无功功率的作用,构建线损计算的BP神经网络模型;根据负荷分布的典型分类,分5类模式进行BP神经网络训练,并采用分布式电源加入后的典型等效负荷分布进行配电网线损计算。使用基于IEEE 33节点系统的修正算例对训练好的模型进行测试评估,结果表明所提方法能够满足含分布式电源配电网理论线损的大规模计算需求,且精度较高,很好地满足了工程应用的需要。The large-scale access of distributed renewable power sources causes frequent fluctuations in the power flow of distribution lines,which brings great difficulties to evaluate the theoretical line loss of distribution networks.To address this problem,a theoretical line loss calculation method for distribution networks based on equivalent load distribution is proposed.The fluctuation of distributed power generation and load is merged into net load consideration,and the equivalent load distribution is defined by combining the uneven distribution of line parameters.The method for obtaining the equivalent load distribution curve based on the equal area rule is established.The BP neural network model for line loss calculation is constructed by taking the equivalent load distribution as the main input feature and considering the effect of reactive power.According to the typical classification of load distribution,5 modes are used for BP neural network training,and the distribution network line loss calculation is carried out using the typical equivalent load distribution after the distributed power source is added.The modified example based on the IEEE 33 node system is used to test and evaluate the trained model,and the results show that the proposed method can meet the large-scale calculation requirements of theoretical line loss of distribution networks with distributed power sources,and has high accuracy,which meets the needs of engineering applications.

关 键 词：分布式电源 配电网 理论线损 等效负荷分布 BP神经网络 

分 类 号：TM744[电气工程—电力系统及自动化]