Research On Hybrid Energy Storage System Of Mine Electric Locomotive Based On Supercapacitor

The mine electric locomotive with lead-acid battery energy storage is the auxiliary transportation equipment in the coal mine,which mainly transports the gangue,equipment and materials in the coal mine.The lead-acid battery has the characteristics of high energy density and good safety,but the power density is low,so it is difficult to respond to the instantaneous power change of mine electric locomotive quickly.The new super capacitor has the characteristics of high power density,fast power response,high charge discharge times and long cycle life.In this paper,the hybrid energy storage system based on super capacitor and battery is applied to the mine electric locomotive.The high power density characteristic of super capacitor and the high energy density characteristic of battery are used to improve the working performance and endurance of the battery electric locomotive.This paper mainly studies the optimal control of hybrid energy storage and DC/DC converter to realize the reasonable distribution of the output power of the two energy storage elements.First of all,the hybrid energy storage scheme is designed.The main energy storage is still lead-acid battery,super capacitor is used as auxiliary energy storage,and bi-directional DC/DC converter is used to distribute the power output of energy storage elements,so as to provide the required energy for the mining electric locomotive.Based on the analysis of the characteristics and parameter calculation of the battery and super capacitor,the bi-directional DC/DC converter circuit and the charge and discharge control strategy are designed.Secondly,by analyzing the baud diagram of the low-pass filter,the low-pass filter is used to realize the power distribution of the hybrid energy storage system.The total power required by the electric locomotive is divided into low-frequency component and high-frequency component,which are respectively distributed to the battery and super capacitor.The power distribution scheme and strategy of the hybrid energy storage system are designed,which realizes that when the electric locomotive starts or accelerates,the super capacitor can quickly respond to the short-term peak power demand of the electric locomotive;when the electric locomotive runs stably,the battery can provide the stable power,which reduces the capacity requirement of the energy storage system for the super capacitor;when the electric locomotive is decelerated and braked,the feedback energy is quickly generated by the super capacitor Absorption improves the energy utilization of the hybrid energy storage system.Finally,the simulation model is built on MATLAB/Simulink platform,and the hardware control circuit and experimental platform of the hybrid energy storage system are designed.The correctness of the hybrid energy storage control system is verified by simulation and experimental analysis,so that the electric locomotive can respond to the demand of high power instantaneously,absorb the feedback electric energy during deceleration braking instantaneously,improve the endurance of the electric locomotive,and increase the instantaneity of the electric locomotive Starting torque.Figure[51]table[4]reference[81]...