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Research On Power Supply Restoration Of Distribution Network With Distributed Generation

Posted on:2020-04-20Degree:MasterType:Thesis
Country:ChinaCandidate:B WangFull Text:PDF
GTID:2392330596479417Subject:Electrical engineering
Abstract/Summary:PDF Full Text Request
As the distribution system becomes more and more complex,the distribution network becomes more and more large,and the occurrence of faults is inevitable.After the permanent failure of the distribution network,it is of great significance to quickly and effectively realize the power restoration in the non-faulty area.With the increasing maturity of distributed generation technology,in order to make full use of the power supply capability of distributed power sources,distributed power sources are heavily connected to the distribution network to improve the reliability of power system power supply and make full use of renewable energy.Therefore,when the power supply is restored in the non-faulty power loss area after the distribution network fails,when the distributed power supply is connected to the power distribution network,the distributed power supply needs to be taken into consideration.This paper mainly studies the power supply restoration problem of distributed power supply.Firstly,the model and node types of different types of distributed power sources are established and analyzed.In the power flow calculation,the equivalent values of various types of nodes are converted into the required PQ type nodes,and the structure and runtime characteristics of the distribution network are analyzed.To ensure the rapid reliability of power supply recovery,the power flow of the distribution network is calculated by using the forward-pushing power flow algorithm.Combined with the characteristics of the distributed power supply mentioned above,the power flow calculation method of the distribution network with distributed power supply is obtained,and the power flow calculation results of the distribution network under the condition of single distributed power access and multiple distributed power access are analyzed.It lays the foundation for the subsequent power supply restoration of the distribution network.A mathematical model for power supply recovery of distribution network with distributed power supply is established.The power supply recovery power loss is minimized,the number of switching operations is the least during the recovery process,and the network loss is minimum after power restoration.The particle swarm optimization algorithm is introduced.Based on the particle swarm optimization algorithm,chaos theory is combined to improve it.In the process of particle population initialization,the ergodicity of chaotic theory is used to initialize the population to ensure the initial population is evenly distributed in the solution space.The convergence speed of the algorithm is easy to get the global optimal solution.Based on the particle swarm optimization algorithm,the power supply recovery steps and processes of the distribution network with distributed power supply are proposed,and the corresponding algorithms are written.The simulation verification is carried out in the example,and the simulation of the distribution network with single distributed power supply and four types of distributed power supply is carried out,which proves the feasibility of the proposed method.
Keywords/Search Tags:Distributed generation, Forward and backward power flow calculation, Distribution network, Restoration reconfiguration
PDF Full Text Request
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