Islanding Partition Of Distribution System With Distributed Generations Based On Community Structure

Distributed generation as an important part of distributed power supply has many advantages,such as easing the energy crisis, reducing environmental pollution and improving the reliability of power supply.In recent years,it has been widely used in power system.At present, more and more DGs start to run in the distribution network gradually.The problem of isolated islands has attracted more and more scholars' attention.Based" on the community partitioning algorithm in complex networks and combined the characteristics of isolated island, this paper explores the method of the islanding partition of the distribution network.Based on the shortest path algorithm and referenced to the distribution network parameters and operating parameters, this paper proposes the construction method of the most adjacency matrix and gets the most adjacency matrix connected graph according to the most adjacency matrix.Finally,according to the principle of priority supply principle and the maximum range recovery principle, the paper calculates the weights of nodes and edges of the distribution network,then, constructs the model of the weighted network of the distribution network with DGs,which has an obvious community structure.Through the simulation analysis of the typical distribution network system with DGs, it can be seen that the construction method of the weighted network model is valid.Considering the influence of load controllability and contact switch status on the distribution network, this paper proposes an island division method based on community structure.lt uses the Newman fast algorithm as the theoretical basis and conbines distributed power distribution network structure and its operating characteristics.The principle of island division and constraint conditions are introduced into the problem of community division.In this paper, the weighted modularity function Q is used to measure the community division.Finally, the scheme of island division is obtained.This paper takes the 69 nodes distribution network system as the simulation example.The experimental results show that the proposed method is feasible. The influence of the load level, the controllability of the load and the contact switch of islanding is fully taken into account in this method.Moreover, this method can realize the maximum range of power supply and improve the power supply reliability of distribution network.