Study On Loss Allocation Method Of Distribution Network With Considering Of Distributed Generation

A large number of distributed power sources in the distribution network are connected to the grid,which will cause changes in the distribution of power flow and losses.Current interaction terms and power quality problems caused by grid-connection of distributed power supply are seldom considered in the existing distribution losses allocation methods.This will inevitably make the losses allocation process error.Therefore,it is very important to choose a relatively reasonable losses allocation method.Firstly,from the aspects of power supply,access location and power factor of distributed power supply,the influence of distributed power supply on network loss is analyzed and verified.Then,this paper introduces two kinds of distribution network loss allocation methods with distributed power supply,and analyzes their advantages and disadvantages.Secondly,in order to solve the problem of a large number of matrix calculations and network loss interaction terms in the process of network loss allocation after the introduction of distributed power supply in distribution network,a distribution network loss allocation method based on losses error is proposed.Thirdly,in view of the network loss apportionment problem caused by the power quality problem which is seldom considered in the current network loss apportionment process,a distribution network loss apportionment method considering harmonics and distributed power supply is proposed.Finally,the effectiveness and feasibility of the above two methods are verified by a 22-node equivalent network circuit diagram.