Research On Scheme Of Cophase Traction Power Supply System

Because of the special structure of electric traction power supply system of electrified railway.Cause a lot of problems exist in electric traction power supply system of electrified railway,such as abundant negative sequence,harmonics and reactive power, and the lost of traction speed and power which are restricted by the neutral section insulator between adjacent power supply sections. A new type of cophase traction power supply system is built by combining YNvd connection transformer and combining Vv connection transformer with IPFC(Integrated Power Flow Controller). The system can comb-out three-phase unbalance basically, and provides minimum harmonic content, thereby, the inconsistency between railway department and electric power department will be solved radically. The remove of the neutral section insulator conform to the trend of the High-Speed Passenger Service and the Heavy Cargo Service.The main research objective in this paper is the scheme of cophase traction power supply system. According to the different connection of transformer,using the different structures of IPFC.We can built the different scheme of cophase traction power supply system. The software simulation is carried out and results show the correnctness of system topology,detection method and control method.The proposed system is proved to be feasible by the simulation.In this paper,first introduce the different scheme of cophase traction power supply system.After that,introducing the scheme of cophase traction power supply system based on the different connection of transformer.Theoretical analysis is carried out based on the different scheme of cophase traction power supply system.The core content of cophase traction power supply system is IPFC,in this paper,there is a detailed description for the control principle and control scheme of IPFC. Power relations, capacity and capacity availability of system are analyzed; methods on detecting reference currents and controlling filters are researched.These two proposed systems are modeled and simulated under MATLAB/SIMULINK in this paper. The proposed configurations of cophase power supply systems, currents balance compensation methods, comprehensive detecting reference are proved to be true and feasible.