Simulation And Software Development Of Traction Power Supply System Load Process For High-speed Railway

The load process simulation of traction power supply system of high-speed railway mainly includes traction load power calculation in the EMU running and power flow calculation of traction power supply system.A traction calculation model is established to obtain the electrical load characteristics in the EMU running;Anda mathematical model of traction power supply system is set up.Based on traction load characteristic,power flow calculation of traction power supply system can be carried out and the change of voltage and current of traction power supply system can be obtained.By correlation theory of traction calculation,the simulation model of traction calculation is set up,and the electric locomotive is equivalent to an ideal power source model;By establishing power supply network model,the equivalent circuit of traction substation and the chain equivalent circuit model of the traction network,then the equivalent circuit model of traction power supply system is established;The load process is combined with thetraction calculation,so a generalmodel of traction power supply system load process simulation is generating.On this basis,the node voltage equation is established and the flow calculation is carried out by the iterative method,and the distribution of the power flow of the whole traction power supply system is obtained.At the same time,simulating the driving process based on power flow calculation can dynamically observe the voltage and current distribution of the entire traction power supply system during the operation of multiple trains and grasp the electrical states throughout the traction power supply system.Based on the Visual C++6.0 platform,the "load process simulation system software for traction power supply system" is developed.It mainly includes "train traction calculation simulation program" and "traction power supply system power flow calculation program".The simulation results of "train traction calculation simulation program" can be used as the load data of "traction power supply system power flow calculation program",so that it is closer to the actual operation of electrified railway and makes the simulation result more precise.Finally,the simulation program is used to simulate the traction power supply system of Dengjiashan,whichis the first high-speed railway--ChangKun passenger linein Yunnan,and the calculation results are compared with the corresponding data in the dynamic test report issued by Academy of Railway Sciences,which verifies the correctness of the model and the algorithm.Meanwhile,by simulating voltage and current conditions of traction network in different operation conditions and different power supply modes,it can provide scientific basis for the feasibility of specific operation.mode.The load process simulation of traction power supply system of high-speed railway is of great significance to study the operation law of high-speed railway traction power supply system and to check and verify the various power supply indexes in power supply system.