含分布式电源的配电网确定性潮流计算

摘要

配电网升级改造使网络拓扑结构发生变化时,需要对系统节点重新手动编号.由于节点编号优化方法不适用网络改变,提出了与节点编号无关的改进前推回代法.归纳了各种分布式电源(DG)在潮流计算中节点类型,给出了改进控制策略下部分DG新的节点类型,分析了在确定性潮流计算中DG可视为有功恒定型节点的依据.基于改进前推回代法,在MATLAB软件下编写了含各种DG的配电网潮流计算通用程序,通过对IEEE33测试系统大量仿真计算,定量分析了DG对配电网潮流的影响.%System nodes need to be renumbered manually when upgrading and reforming distribution network makes network topology change.Because optimization method is inapplicable to the network change,an improved forward and backward sweep algorithm is proposed which is unrelated to node label.In this paper,node type of sorts of distributed generation (DG) in power flow calculation are induced and part of new node type of DG under improved control strategy are provided.The basis of DG as active constant node in certainty power flow calculation is analyzed.Based on improved back-forward sweep algorithm,general programs of power flow calculation in power distribution network of DG are programmed by MATLAB and the impact of DG on flow calculation to distribution network is analyzed quantitatively by plenty of simulation calculation of IEEE33 test system.