Optimal AT Power Supply And Transformer Wiring Type

Railway transportation is the main transportation way in china.Abundances of new railways are in constructing at current, the total railway will come to 100 thousands in 2010.For the sake of satisfying the new requirement brought forward by the development of chinese economy and people's living standard, high speed train and heavy-haul train have become the electric railway necessity tend.Traction power supply system is one of the main factors in realizing high speed and heavy-haul railway transportation,the style of power supply for traction network and the transformer wiring type decide the power supply's quality and effect of the traction power supply system. Because of the several inherent technic advantages of AT(Auto-Transformer) power supply, it has become the first choose for high speed train and heavy-haul train.By taking 55kV AT power supply which is characterized by setting up Auto-transformer at the export of substation for example, the paper analyzes the electrical performance of single-track AT power supply network,terminal-parallel double line AT power supply network and all-parallel double line AT power supply network. Also,the thesis proves that all-parallel AT power supply network has more superiorities.Then, Japan-model AT power supply,France-model AT power supply,new model AT power supply besides several typical traction transformer wiring types suited for AT power supply system are studyed. A conclution that the new mode AT power supply and YNvd connection traction transformer have the best electrical performance is gotten.The simulation models builded based on the Matlab/Simulink software platform as follows:several typical traction transformer simulation models which suit for AT power supply, all-parallel double line AT power supply network simulation model, and Japan-model AT power supply system simulation model,France-model AT power supply system simulation model,new model AT power supply system simulation models. Basing on the simulation models builided above, on the same condition a simulation is carried out in normal and fault state separately.The simulation results obtained demonstrates that the new model AT power supply has superior electrical performance.Summing up all transformer wiring types and AT power supply's technical and economic performance,we know that the all-parallel double line AT power supply system, consisted by YNvd wiring traction transformer and new model AT power supply, has good performance.