基于有向图的含分布式电源配电网孤岛划分模型

含分布式电源配电网的孤岛运行模式可以充分提高分布式电源利用率和配电系统供电可靠性。文中提出一种基于有向图模型的含分布式电源配电网的孤岛划分新模型。首先,提出一种基于有向图的配电网结构模型,该模型通过引入"虚拟节点"和"虚拟需求"建立了支路方向可变的配电网模型,从网络结构模型上保证了配电网孤岛运行区域的连通性和辐射状结构。然后,基于有向图模型,建立了考虑联络开关可操作性、负荷重要等级、负荷可控性以及分布式电源运行特性的孤岛划分模型,并将其转化成一个混合整数线性规划问题以便于求解。最后,采用PGE 69节点配电系统进行测试,验证了所提出的孤岛划分策略的有效性。

Islanding Model of Distribution Systems with Distributed Generators Based on Directed Graph

Islanding operation of distribution systems with distributed generators (DGs) is able to fully enhance the availability of distributed energy and reliability of power supply. A novel islanding model of distribution systems with DGs is proposed, in which the directed graph model is used. First, two new concepts, one of virtual node and the other virtual demand, are introduced to build the distribution network structure model with alterable branch direction, so that the feature of distribution systems that it operates in dendroid mode can be guaranteed by the proposed distribution network structure model. Then, a novel islanding model of distribution systems with DGs is proposed with tie switches operability, the load priority and controllability and operation characteristics of DGs considered. The proposed islanding model is converted as a mixed-integer linear programming problem for easy solution. Finally, a modified PG&E 69-bus system is used for demonstrating the effectiveness of the proposed island partition strategy. This work is supported by National Key Technologies R&D Program (No. 2013BAA01B02).