Research On Reconfiguration Of Distribution Network With Distributed Generation

With the development of social economy,electricity demand rapid growth and the scale of the distribution network is expanding.The structure of distribution network is also becoming increasingly complicated.As to many reasons,the loss of electrical power in distribution system accounts for a large part of the whole power system,so the economic operation is impossible.At the same time,as the world's energy problem becomes more and more serious,distributed generation(DG)is introduced and applied widely.And in the construction of the smart grid,DG is an integral part.Under this complexion,the research on reconstruction of distribution network with DG is significance.Based on the domestic and foreigns distribution network reconfiguration research,combining with evaluation example,distribution network reconfiguration is established and analyzed based on optimal flow pattern(OFP).The specific work is as follows:(1)The analysis and modeling of distribution network reconfiguration.The existing algorithm of distribution network reconfiguration is analyzed.Based on the research of graph theory,this paper establishes the distribution network topology model corresponding to the actual distribution network.According to the forward and backward power flow calculation method,this paper establishes the mathematical model of the minimum network loss as the goal by researching the model of distribution network reconfiguration.(2)IEEE-33-nodes network and regions of the city distribution network in Tianjin is as the example to analysis.The papers have a calculation and analysis for the example and practical engineering based on the OFP,and the expected results are obtained.(3)DG connecting electric grid is studied.This paper points out the problems of DG by analyzing the related theory and technology.The existing of interconnection rules are expounded.The mathematical model and the network topo logy are established.(4)The research on the reconfiguration of distribution network with DG.The IEEE-33 nodes with DG is studied as an example,and the minimum network loss as the goal of its optimized reconstruction.On this basis,the paper establishes an corresponding distribution network according on the engineering practice,and do a research on the access of DG and reconstruction.The result is same with the expected.It will have important significance for the practical use.