Research On The Self-used Power System Of High-speed Railway Station Based On The Utilization Of Regenerative Braking Energy

With the rapid development of China’s high-speed railway,China is striding forward from a big railway country to a powerful railway country.However,high-speed trains all adopt regenerative braking mode,and a large amount of regenerative braking energy is generated every year,which is not fully utilized,resulting in great waste.Therefore,how to make full use of the regenerative braking energy of high-speed railway is an urgent problem to be solved in the process of rapid development of railway department.Therefore,this paper studies a set of self-used power system of high-speed railway station based on the utilization of regenerative braking energy,which transmits regenerative braking energy from 27.5k V traction network to high-speed railway station for all kinds of electric equipment in the station.This scheme can not only make full use of regenerative braking energy,but also reduce the annual electricity charges paid by high-speed railway stations to the main network,so as to achieve the purpose of energy saving and economic operation of railway departments.Firstly,aiming at the problem that the regenerative braking energy can not be fully utilized and the power consumption of high-speed railway station is limited,this paper proposes a "energy feedback + energy storage" structure of self-used power system of highspeed railway station based on the utilization of regenerative braking energy.Based on this structure,the AC-DC-AC converter in the energy feedback system is further analyzed,and the energy storage device and DC/DC converter in the energy storage system are studied.Finally,the structure design of regenerative braking energy recovery system is completed.This paper further studies the "single-phase to three-phase" AC-DC-AC converter in regenerative braking energy utilization system,analyzes the circuit working state and mathematical model of single-phase parallel rectifier and three-phase inverter,designs the modulation strategy and control strategy of single-phase parallel rectifier and three-phase inverter,and designs the filter circuit parameters of DC side and AC side of the system.Finally,the single-phase parallel rectifier and three-phase inverter and their modulation and control strategies are simulated by Matlab/Simulink.The simulation results verify the correctness of the modulation strategy,control strategy and corresponding circuit parameters designed in this paper.In order to improve the structure of regenerative braking energy utilization system,this paper studies the DC/DC converter with super capacitor bank energy storage,and proposes a DC/DC converter control strategy to prevent super capacitor overcharge and overdischarge.An energy management strategy of regenerative braking energy recovery system for highspeed railway station is designed.Finally,the stability of the system under two conditions of constant regenerative braking power and instantaneous regenerative braking power is verified by simulation,and the correctness of the system design is verified theoretically.Finally,in view of the shortcomings of energy management strategy in the regenerative braking energy recovery system designed in the previous paper,an optimization strategy of energy management of station self-used power system based on particle swarm optimization is proposed.The paper studies the economic and comfort function of high-speed railway station.Particle swarm optimization is used as the core algorithm of energy optimization strategy to optimize the output of each subsystem in the self-used system of high-speed railway station.Finally,the simulation system is built by Matlab/Simulink.The simulation results show that the proposed energy management optimization strategy can make full use of regenerative braking energy and maintain the comfort in the station.