分布式电源混合并网的配电网潮流算法研究  

Algorithm Research of Load Flow of Distribution Network with Different Distributed Generations

作　　者：李丹[1] 陈皓勇[1] 

机构地区：[1]华南理工大学电力学院,广州510640

出　　处：《华东电力》2011年第1期76-80,共5页East China Electric Power

基　　金：教育部新世纪优秀人才支持计划(NCET080207);教育部科学技术研究重点项目(109128)~~

摘　　要：计及分布式电源(DG)的潮流计算是含DG的配电网优化规划和运行的基础前提。在分析和建立几种应用广泛的DG潮流计算模型基础上,提出配电网潮流计算的改进前推回代算法。算法的本质是把DG的PV、PQ(V)以及PI节点转换为前推回代法可处理的PQ节点。针对PV节点转换困难的问题,改进了戴维南等值阻抗矩阵法,并提出快速网络搜索法形成与PV节点相关的节点阻抗矩阵的部分元素来修正PV节点注入的无功功率。就DGs的不同类型设计了6种方案在90节点配电系统进行反复测试,测试结果验证了所提算法收敛特性好、计算速度快、有自动处理PV节点无功越限的能力。根据测试结果分析了DGs并网对配网潮流的方向、馈线电压以及系统网损的影响。Load flow calculation with distributed generations is the basic premise for the optimization planning and operation of distribution network.On the basic of the analysis and establishment of several widely used DG load flow calculation models,an improved algorithm based on forward/backward sweep to calculate load flow is proposed in this paper.The essence of this algorithm is to transform PV,PQ（V） and PI node of DG into PQ node.Considering the difficulty in transforming PV node,the Thevenin equivalent impedance matrix is improved and the network search method is presented to form some elements of the node impedance matrix to modify the PV node reactive injection.Six schemes are designed for the different modes of DGs,and are tested repeatedly in 90-node distribution system.The test results verify that the proposed algorithm in this paper is good in convergence properties,fast in calculation,and capable of automatically processing PV node reactive limits.At last,according to the tests results,this paper analyzese the impacts caused by the access of DG,such as the direction of the load flow of distribution network,the feeder voltage and the loss of the system.

关 键 词：分布式电源 配电网络 潮流计算 前推回代 戴维南等值阻抗矩阵 网络搜索 

分 类 号：TM71[电气工程—电力系统及自动化]