辐射型网络潮流的分层前推回代算法  

LAYER-BY-LAYER BACK/FORWARD SWEEP METHOD FOR RADIAL DISTRIBUTION LOAD FLOW

作　　者：颜伟[1] 刘方[2] 王官洁[2] 徐国禹[2] 黄尚廉[1] 

机构地区：[1]重庆大学仪器科学与技术博士后流动站,重庆400044 [2]重庆大学高电压与电工新技术教育部重点实验室,重庆400044

出　　处：《中国电机工程学报》2003年第8期76-80,共5页Proceedings of the CSEE

摘　　要：基于配电网络特有的层次结构特性,论文提出了一种新颖的分层前推回代算法。该算法将网络支路按层次进行分类,并分层并行计算各层次的支路功率损耗和电压损耗,因而可大幅度提高配电网潮流的计算速度。论文在MATLAB环境下,利用其快速的复数矩阵运算功能,实现了文中所提的分层前推回代算法,并取得了非常明显的速度效益。另外,论文还讨论发现,当变压器支路阻抗过小时,利用Π型模型会产生数值巨大的对地导纳,由此会导致潮流不收敛。为此,论文根据理想变压器对功率和电压的变换原理,提出了一种有效的电压变换模型来处理变压器支路,从而改善了潮流算法的收敛特性。基于IEEE40节点的配电网算例系统和1338节点的实际系统进行了仿真计算,结果表明:该文算法具有速度快、收敛可靠的明显优点。Based on special hiberarchy characteristic of radial network, this paper proposed a novel layer-by-layer back/forward sweep distribution load flow algorithm. In this algorithm, the branches of network are sorted by layers and the loss of voltage and power of branches in the same layer can be parallel computed, so the speed of power flow can be increased greatly. In this paper, this algorithm is realized by making full use of fast plural matrix operation function of MATLAB, and the increase of that speed is also outstanding. Furthermore, It is testified in this paper that the large shunt conductance will bring on the convergence problem of distribution load flow, which is produced by theΠ equivalent model when the impedance of transformer branch is too small. For solving this problem, an effective equivalent model of voltage transforming is proposed according to the principle for ideal transformer to transform voltage and power. In two power systems, the IEEE40 bus system and a 1338 bus actual power system, the proposed method has been tested. The results indicate that it has faster speed and more reliable convergence.

关 键 词：配电网 分层前推回代算法 辐射型网络 潮流算法 

分 类 号：TM744[电气工程—电力系统及自动化]