Research On Comprehensive Treatment Of Harmonic Suppression And Reactive Power Compensation In Subway Traction Power Supply System

Subway has other means of transport at the same time not have punctuality,safety,convenience and economy,can effectively alleviate the urban traffic congestion situation,improving the structure of the urban residents travel,raise the level of urban public transport services.Put into use but the subway traction power supply system of the cable line,and equipped with a series of nonlinear power electronic device,the system harmonic content rich,large cable capacitive current,reactive delivers,voltage fluctuation and flicker,lack of power factor and a series of harmonic and reactive power problem,ruined the secure and stable operation of the metro power supply system.And conventional measures already can't satisfy the national standard,so you need to find a suitable for metro areas of reliable,economic of harmonic and reactive power control scheme,as much as possible,the reduction of the subway system access the adverse influence on the urban power grid.This article first to urban rail power supply system and the structure and characteristics of traction train are analyzed in detail,and then using Matlab/Simulink simulation platform of subway traction power supply system and traction model,implementation of a traction train traction and braking,idle running three operating conditions of the simulation,and analysis by the urban rail power supply system with FFT module into the harmonic of power grid.Then,the structure of passive filter and active filter and the basic principle is analyzed,combining with the subway traction power supply system of the engineering practice,and puts forward the suitable for metro power supply system of the new hybrid filter,and then based on the Matlab/simulink simulation platform,the three filtering effect simulation comparison,a new hybrid filter is proved the superiority of the effect of filter in the subway traction power supply system.Finally,the STATCOM simulation model was established in the Matlab/simulink simulation environment,and the performance test of STATCOM was carried out by simulation.To verify the effectiveness of the STATCOM reactive power compensation device to keep system voltage stability of reactive power regulation ability,and restrain the subway traction locomotive voltage fluctuation and flicker caused by frequent start-stop ability,and compared with SVC,the superiority of its response speed compensation and compensation amount.