Study On The Influence Of Regenerative Braking On Power Supply System Of Xicheng High-speed Railway Train And Its Solution

With the opening and operation of Xicheng High-speed Railway,the influence ofregenerative braking power and harmonic wave transmission on power supply quality of Xieheng High-speed Railway is becoming more and more prominent.Therefore,it is necessary to comprehensively evaluate power supply quality by means of theoretical modeling,simulation calculation and measurement and verification according go the characteristics of this line and combinine with the actual engineering of this line,and put forward improvement measures.Shi.It is of great significance to the operation of high-speed rail on high slope and the standard of building such high-speed rail on high slope.Fistly,the field measured data of traction power supply system in the long ramp section of Xicheng high-speed railway are taken as the basic data of this paper.At the same time,the test sehcme and test equipment are briefly introduced.The measured voltage data of Huyi traction substation in the continuous long ramp section of Xicheng high-speed railway are also analyzed and analyzed.The power values of the power supply arm of Huyi-Dongliushuigou are calculated.Finally,the cmpheasis is put on.The variation of voltage and current in Huyi traction substation,Shichagou AT substation and Dongliushuigou area at the maximum regenerative braking power is analyzed.Secondly,the transmission mechanism of regenerative braking power and harmonic current in traction power supply system of Xicheng high-speed railway EMU is studied Through the simulation platform such as MATLAB,the traction network simulation model of harmonic transmission is established,and the simulation caleulation model of energy feedback of regenerative braking EMU and the coupling of traction power supply system is established.At the same time,according to the actual train operation of Xieheng high-speed railway,the distribution characteristics of regenerative braking energy of different EMUs during the operation of Xicheng high-speed railway and the calculation model of power supply quality evaluation of traction power supply system are studied.The interactive coupling simulation model of EMU and traction power supply system is established,which involves the feedback characteristics of regenerative braking energy.The model is advanced according to the field measured data.At the same time,the harmonic characteristic test and resonance warning research are carried out.According to the actual situation,the long-term test and online evaluation of the harmonic characteristics of traction station,AT station and district station are carried out.The potential harmonic resonance is timely warned,and the influence of regenerative braking on traction power supply system is analyzedFinally,the reasons for the influence of regenerative braking and harmonic resonance on the quality of traction power supply are analyzed,the engineering measures to ensure the stability of catenary voltage are formulated,and the solutions to the influence of regenerative braking on traction power supply system of Xicheng high-speed railway train are put forward,such as the solutions to the impact of regenerative braking on traction power supply system under regenerative braking,such as the type and installation of regenerative braking energy storage devices,In order to reduce the voltage rise of traction network and ensure the safe and stable operation of traction power supply equipment,we should install energy dissipation resistance to suppress reactance,and use in-phase power supply device to feedback regenerative braking energy.