Research On The Sizing And Energy Management Of The Energy Storage Tram Power System

Recent years,cities have been expanding,the requirement for traveling is increasing constantly,as well as the awareness of energy conservation and environmental protection.In this situation,the rail is booming development due to its large capacity and speed.According to the different application environments and actual requirements,there are many types of urban rail transit equipment.For ground rail transportation,it is in a relatively open environment,and it needs to face the existing urban architecture,urban landscape and security issues.So the way which uses traction power supply energy storage technology is one of the more appropriate choice.The new opportunities of development for trams are coming.For energy storage trams,the on-board energy storage system is the power source of the vehicle,the on-board energy storage system directly affects the dynamic characteristics of the vehicle.In-vehicle energy storage systems not only need to store enough energy but also have to withstand high-power transients.However,there is a lack of energy storage equipment that meets this requirement recently.According to the existing energy storage technology conditions,it is necessary to combine a high energy density energy storage element and a highpower density energy storage element to form a hybrid power supply system to supply the vehicle so as to meet the power and energy demand of the tram during operation.The key issues that how to match the energy storage elements with different characteristics and how to coordinate the control of the input and output of the energy of each element needs to be studied.This article focuses on energy-saving trams that combine power batteries with super capacitors and studies parameter matching and energy management on their power systems.The specific research work of the thesis mainly includes:(1)According to the analysis of the basic characteristics of hybrid tram electric train power system structure,components and sample vehicle test data,a hybrid electric tram simulation platform is established under the environment of Matlab/Simulink.The research and testing of management strategies lay the foundation to match the power system parameters and energy.Through the comparison of simulation results with experimental data,the effectiveness of the simulation model has been proved.(2)Based on the running characteristics of trams,the power and energy requirements of the power system are analyzed.According to the analyzed result,the corresponding constraints are established.The quantity range of the energy storage components is obtained by simulation.The parameters of the power system are selected according to the established optimization objectives.The results obtained by this method are proved by examples,and the optimal objective function can be achieved under the condition that the tram operates according to the operating conditions.(3)Taking the difference of power and energy demand when trams operate in different sections into account,a dynamic threshold management strategy based on operating conditions of trams is proposed.Based on this management strategy,particle swarm optimization algorithm is applied to optimize the configuration parameters of the tram power system and the target cruising speed at the same time,so that the target speed of the tram can be adapted to the changes of the line conditions.To minimize the power system configuration on the basis of ensuring the running performance of the tram.