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Research On Fault Location And Restoration Reconstruction Of Distribution Network Based On FTU Fault Information

Posted on:2022-06-26Degree:MasterType:Thesis
Country:ChinaCandidate:H R ZengFull Text:PDF
GTID:2512306530480004Subject:Electrical engineering
Abstract/Summary:PDF Full Text Request
With the development of China's economy,the whole society has higher and higher requirements for power supply reliability of power system.Among them,the distribution network automation system has become an indispensable part of the power system because of its convenient and efficient advantages.When the distribution network fails,it also plays a very important role in judging the fault location and restoring the power supply in non fault areas,so it has become a key research object at home and abroad.Therefore,this paper focuses on the fault location method and power supply recovery technology of distribution network.Firstly,several common fault location methods of distribution network are introduced.Among them,the traditional matrix algorithm is simple in calculation and fast in positioning,but it has some disadvantages,such as poor fault tolerance,cumbersome in normalization,and need to set positive direction for many times.To solve these problems,an improved fault location matrix algorithm for distribution network is proposed.It only needs to set a positive direction,and does not need to normalize the matrix and complex multiplication calculation.Combined with the new fault location criteria,the fault area of distribution network can be accurately located.When the feeder terminal unit(FTU)is lack of upload fault information due to external environmental factors,the improved matrix algorithm also has a certain fault tolerance.The simplified 14 node network is taken as an example to show that the improved matrix algorithm can locate the fault area accurately and effectively.Secondly,after locating the fault area of the distribution network,the fault area should be isolated immediately,and the power supply of the non fault blackout area should be restored in time.In the process of power supply restoration,considering different objective functions,different power supply restoration schemes with different emphases are often obtained.In this paper,the minimum network loss,the minimum voltage offset and the minimum number of switching operations are taken as the objective functions to establish the solution model,and then the above objective functions are normalized and integrated into a single objective function by using the analytic hierarchy process(AHP),so as to reduce the search dimension and improve the search efficiency.At the same time,by using the loop group search strategy,the network is divided into several basic loop groups to reduce the search space,and the repair rules of forbidden branch groups and infeasible solutions are established to meet the topological constraints of distribution network.The forward backward method based on hierarchical nodes is used for power flow calculation,and then the variable neighborhood search(VNS)improved binary particle swarm optimization(BPSO)algorithm is used to solve the above problems.By introducing VNS,the neighborhood of the individual historical optimal solution particles in BPSO algorithm is searched,so that the particles trapped in the local optimal value can jump out of the limit and have better global search ability.Finally,the ieee-33 bus test network with DG and without DG and PG & E69 bus test network in USA are used as examples.The results show that the proposed method can effectively solve the problem of power supply restoration in distribution network,and can also put forward an effective scheme for optimal reconfiguration of distribution network.
Keywords/Search Tags:distribution network, fault location, restoration and reconstruction, matrix algorithm, binary particle swarm optimization
PDF Full Text Request
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