分布式发电在配电系统中所占比重越来越大,对传统的配电网潮流计算提出了新的挑战和要求.该文介绍了几种分布式电源典型的并网接口,针对微型燃气轮机并网系统、风力发电系统、燃料电池及光伏并网系统,分析了其并网结构及运行方式,建立了各自在潮流计算中的数学模型,根据各分布式电源的控制特性,将其节点类型归结为PV节点,PQ节点,Vθ节点,PI 节点,P-Q(V) 节点.针对特殊节点提出了在潮流计算中的处理方法,其本质是在迭代步将各类节点转换成为传统方法能够处理的PQ节点或PV节点,有利于开展含有分布式电源的配电系统潮流计算研究.%With gradually rising proportion of distributed generation in distribution system, traditional power flow calculation of distribution system faces new challenges and requests. In this paper, interfaces between power grid and DG are illastrated. The grid-connected structures and operation modes of typical distributed generation , including micro turbine, wind turbine, fuel cell and photovoltaic cell are analyzed. Based on the above, their models are built in power flow calculation of distribution system. Different distributed generation are classified into the following types: PV node, PQ node, VQ node, PI node and P-Q(V)node. For special nodes, processing methods are proposed according to their properties in power flow calculation, which can be transformed into traditional PQ or PV node during iteration. Further research on power flow calculation can be proceeded baseed on the research.
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