Research On The Mixed Energy Storage System Of Mine Battery Electric Locomotive

Mine electric locomotive is used for transporting gangue,equipment and materials in underground coal mine.The operation condition of mine electric locomotive has great influence on its transportation efficiency and production cost.Lead-acid batteries are generally used in the energy storage system of traditional locomotive.Since the lead-acid battery came into being,it has been proved that it has the characteristics of high energy density and good safety performance,and it is also suitable for the working environment of underground roadways.However,lead-acid batteries have the disadvantages of limited charge and discharge times,long charging time and low service life.One of the most important point is that the battery as an energy-type energy storage components can not quickly respond to the change of power,which is bound to increase the capacity of the battery to meet the demand of load dynamic power,resulting in the increase of the volume of the electric locomotive energy storage system.In recent years,supercapacitors have been widely used in various energy storage devices due to their unique characteristics such as high power density,repeatable charge and discharge,rapid response to power changes,long cycle life and wide range of ambient temperature.Therefore,this paper proposes to combine the high energy density characteristics of the battery and the high power density characteristics of the supercapacitor to form the hybrid energy storage system and apply it to the mine motor vehicle,so as to achieve better performance of the electric locomotive energy storage system.The mixed energy storage scheme proposed in this paper is as follows: battery bank is used as the main energy storage power supply,and supercapacitor bank is used as the auxiliary energy storage power supply.The battery bank and supercapacitor bank are connected in parallel at the side of the inverter to provide energy output for the mining electric locomotive.A DC/DC converter circuit based on battery and supercapacitor is designed;The capacity parameters of battery and supercapacitor are calculated;The constant current and constant voltage charging method for supercapacitors is determined;The overall scheme of power distribution and its control strategy are determined.On this basis,the power output of power distribution is completed by controlling the DC/DC converter circuit;Through the three-phasePWM device,the inverter process of energy flowing from the energy storage device to the driving device can be realized,and the rectification process of energy flowing from the driving device to the energy storage device can also be realized.When the running condition of the mining electric locomotive is in the starting or accelerating state,the mixed energy storage device needs to respond to the power demand of the electric locomotive quickly and discharge rapidly in a short time to provide the peak power required by the current mining electric locomotive.In the hybrid energy storage system,the high power density characteristics of the supercapacitor and the quick response to power changes can provide peak power to meet the power demand of the electric locomotive and reduce the impact on the battery.Because of its high energy density characteristics,the accumulator provides stable power to cope with the stable operation condition of mining electric locomotive,which reduces the requirement on the capacity of supercapacitor.When the mining electric locomotive is faced with deceleration state or parking braking state,the supercapacitor can absorb the feedback energy,which can reduce the consumption of mining electric locomotive and improve the running mileage of electric locomotive.This paper designs the hardware and software for the circuit topology of the hybrid energy storage system;The simulation model was built on matlab/simulink platform,and the feasibility of the method was verified through simulation analysis.Figure [47] table [5] references [63]...