The Research On Optimization Scheme Of The DC Power Supply System Of Traction

With the development of urban economy, The subway construction is also in orderly in progress. The power supply modes of subway are diversification, This paper Selects the cent-ralized power supply. From the selections of the external power source-> traction substation position.comprehensive evaluation of the power supply, three aspects to explain how to opt-imize the whole subway traction power supply system.This paper analyzes the external power source selection first. The centralized power supply mode.according to the length of the subway line, setting more than one substation on the line,The substation needs two power lines.How to select the two power lines. After asc-ertaining the substation capacity, according to the foundation data of the city grid.when the su-bstations connect to different points of the grid, Analysising the capacity-indicators of elec-trie power supply, getting the most suitable points of the grid.The capacity-indicators contain bus voltage level、line load rate、rower generator and so on.Then discussing the selection of traction substations. In general, the traction substations are constructed with the stations.The area of dense stations, Trains restart frequently, energy consumption is large, the places of load relative concentration, constructing traction subs-tation densely. Theoretically the line loss will reduce relatively. In this paper, according to a specific lines, put forward three kinds schemes of substation location, and use Matlab/Sim-ulink platform to build actual model of subway line, different departure intervals have dif-ferent simulation estimates. In the premise of satisfying the power supply capacity indicat--ors, satisfy the schemes of substation location by the line loss.At last combined with front two parts, using simple analytic hierarchy process, choose the best scheme.