Intelligent Planning Of Medium Voltage Distribution Network Based On Power Supply Model

Medium voltage distribution network is an important part of the modern powersystem, the net structure is the bones of the medium voltage distribution network. Inthe past the research of the net structure is mainly concentrated in the connectionmode, but is lack of concern on the grid as a whole. At present, many developedcountries begin to use standardized power supply model to build a high level mediumvoltage distribution network. In view of the many advantages of the power supplymodel, attention and study to supply model at home and abroad are increasing moreand more. Thus it will have important practical significance to make a rationalplanning of the medium voltage distribution network based on the supply model.For the routing of the medium voltage distribution network, the traditionalmethod exists the local problems and can not be directly applied to the routingproblem which based on the power supply model. This paper is based on theresearches of the power supply model home and abroad, combines medium voltagedistribution network planning with the power supply model concept, makes a smartrouting planning study of the medium voltage distribution network based on thepower supply model from the overall planning perspective.(1) On the basis of the collate and summarize of the ralated concept of the powersupply model, this paper makes automatic routing planning based on the powersupply model with the single contact connection mode. In the mathematical model ofthe planning, comprehensive cost model including the radiation line, the contact lineand the branch line is created, which makes the optimization goals more holistic. Inthe course of the set up of the optimization model, ant colony algorithm is applied tocreat the radiation lines, and then Floyd shortest path method is used to construct thecontact combination of the terminal nodes of the radiation lines. Optimal routingresults are obtained by the optimize operations of the chromosomes constituted of theradiation lines and the contact lines. In the aspect of the optimization method, throughusing the genetic simulated annealing algorithm, the problem of prematureconvergence of the algorithm is effectively overcomed. Compared with the traditionalautomatic routing of distribution network planning, the routing method in this studyhas the global optimality. (2) Using the idea of the traditional ant colony algorithm for reference, a multiplenests ant colony synergetic algorithm is proposed for the automatic routing planningof the branch line. In the process of the algorithm, each load point is placed on onenest of ants, the nodes which the trunk lines were composed of are regarded as thefinal node which the ants crawl towards, through the local and global pheromone’supdate, ants take the state transition by using the pheromone of the entire network inthe process of the route selection, which reflects the collaboration between thedifferent nests of the ant. Through the sample verification, the routing path generatedby this algorithm is not the simple superimposed result of the shortest path, but is theselection of the path from the global perspective of the distribution network.Therefore, the routing results have the overall optimality, which verify theeffectiveness of the algorithm.(3) On the basis of the single contact routing, this paper makes the automaticrouting planning of the power supply model with the multiple segmentations multiplecontacts. In view of the constitution of triangle power supply model with triplesegmentation triple contact, a planning model of automatic routing is founded byusing the step by step method which is from the single radiation to single contact totriple segmentation triple contact. Then the power supply model is optimized from theglobal perspective by using the genetic algorithm. Through the sample verification,the routing result is in accordance with the characteristic of the planning are obtainedwhich proved the feasibility of the above mentioned algorithm.(4) This paper makes automatic routing planning based on the power supplymodel with the opening and closing connection mode. Routing results of the in-stationsingle contact line and the supply range of the between-station opening and closingare determined by using the routing method of the single contact power supply model,on this basis, the best location of the each opening and closing in the power supplymodel is determined by learning the idea of the substation location, and the routingmethods of the into and outlet line of the opening and closing are given. Through thesample verification, the ideal routing result is obtained which can provide somereference to the planner.