Energy Optimization Allocation Strategy In Multi-Energy Storage System For Rail Traffic

New energy-driven rail vehicles have been identified as a practical and effective way to solve the energy crisis,environmental pollution,urban congestion.Car battery and super capacitor multi-energy storage system(Multi-Energy Storage System,MESS)applied to the rail vehicle has a significant advantage.Based on the power/energy characteristics of lithium batteries and supercapacitors,this paper describes how to filter power distribution to multi-energy storage systems by low-pass filters.In this paper,the bandwidth of the filter is designed to optimize the system energy.This strategy has to reduce the peak power of lithium batteries,smooth lithium battery current fluctuations and so on.Specific research content and work are as follows:First,the multi-energy storage system model was studied.According to the characteristics of rail transit and the advantages of MESS,the different topology of MESS is analyzed and compared,and the energy storage element is selected,and the energy storage element battery and ultracapacitor(UC)model are studied.Then,the paper discusses the distribution of energy control strategies.Based on the low-pass filter to filter the characteristics of different frequency bands,designed the cut-off frequency,so that optimize the allocation of energy storage system energy.In this paper,the energy management method of multi-energy storage system is proposed to reduce the system loss and distribute the system energy and peak power reasonably.Secondly,the multi-energy storage system is analyzed and simulated.Combined with Example 1 and Example 2 for power distribution analysis,the system power loss described.Based on the MATLAB/Simulink simulation results,the battery and supercapacitor energy are allocated reasonably to reduce the fluctuation range of the battery current,thus prolonging the battery life.Finally,the feasibility of energy control strategy of multi-energy storage system is experimentally verified.The power distribution strategy was studied by dSPACE test bench.Compared with the simulation and experiment,the results show that the control strategy reasonably allocates the energy of the lithium battery and the super capacitor so that the energy of the vehicle storage system drives the rail vehicle.