Application Research Of Reconfiguration Technology In Urban Distribution Network

As the terminal of the power system,the distribution network is the important connection of the power system and the users.With the gradual development of smart grid construction,as one of the advanced application functions of distribution automation,distribution network reconfiguration is an important means of optimization for normal operation.With the change of network structure,the system power loss can be significantly reduced while improving the system voltage quality.According to the running status of Duanzhou urban distribution network,the operation problems are analyzed,aiming at the typical distribution station automation transformation gives the design content,put forward the method of distribution network reconfiguration based on improved genetic algorithm,and applied to the actual distribution network.After analyzing the failure of one circuit of the "3-1" grid feeder group of Duanzhou distribution network,the profit after network reconfiguration is compared.The main work is as follows:First,the background and significance of the distribution network reconfiguration research are expounded,and the research status and further development direction of distribution network automation and network reconfiguration are analyzed.Secondly,it introduces the basic situation of urban distribution network in Duanzhou District and the overall goal of distribution network automation transformation.Aiming at the transformation project of Longjingxuan 686 public distribution station on the north line of the city,it designs the typical intelligent ring network load switching distribution station transformation,and explains the access cabinet,distribution cabinet,primary scheme and network construction scheme.According to the distribution network structure,the topology analysis is carried out,and the basic content of the forward and backward power flow calculation method is analyzed.In view of the shortcomings of genetic algorithm,an improved immune genetic algorithm is proposed.Thirdly,the mathematical model of distribution network reconfiguration is established,and the possible infeasible solutions in distribution network reconfiguration are analyzed in detail.The method of decimal encoding based on loop and the principle of homeomorphic graph are used to analyze and correct the infeasible solutions,which can effectively avoid useless calculation.The reconstruction method is validated by the IEEE33 node example.By comparing and analyzing the population evolution,the improved genetic algorithm has better convergence performance.Finally,the reconfiguration analysis of 10 kV distribution network of Jiaoyuan Substation in Duanzhou District shows that the reconfiguration application can not only significantly improve the voltage quality of the distribution network,but also significantly reduce the loss rate of the network,and can achieve better benefits in economic operation.Finally,the basic requirements of power supply restoration are expounded,and the power supply restoration process of simple radial distribution network is analyzed.The mathematical model of fault recovery reconfiguration is established,the basic flow of optimal solution for fault recovery reconfiguration is given,and the fault recovery analysis of "3-1" grid feeder group of Duanzhou distribution network is carried out.