Study On Harmonic Analysis And Suppression Of High-Speed Railway Traction Power Supply System

As a key technology of medium and long term planning and stability of China 's railway network,high-speed railway electrification is the main direction of China 's future railway development.But the traction network and electric locomotive will generate harmonics in the process of power supply,not only will impact on the grid,but also make the harmonic current greatly increased,resulting in excessive voltage,leading the power supply facilities can not to operate normally and safely.This paper focuses on the resonant characteristics of high speed railway traction characteristics of the network research,research on simulation model of traction power supply network,the resonance characteristics of simulation system,will be simplified as a current source,a traction network,without considering the coupling relationship and locomotive traction network.By comparing the simulation results with the theoretical values,the simulation results show that the proposed model.The traction power supply model is established by means of electromagnetic transient simulation,and the equivalent power system simulation is carried out.Analysis of the power quality of electrified railway and compensation technology,proposed the quality assurance system of electrified railway,were studied by using the balance transformer and different traction power control mode,this example focuses on the design and application of the balance transformer V/v transformer,analysis the principle and structure of power compensation.In this paper,the simulation results of the electromagnetic transient hybrid model of the locomotive traction network,the power grid and the electromechanical system are establishedFinally,through the study of single-phase and three-phase SVC compensation SVC technology analysis,establish the compensation model,to analyze the compensation harmonic of electric railway,the negative sequence compensation effect and power factor,shows the correctness of the compensation principle.