Research On Optimization Of Energy Storage System And Power Supply Strategy For Tram

With the continuous development of the economy and the increasing population,the pressure on the urban transportation system is gradually increasing,the more environmentally friendly,energy-saving and more sustainable rail transit system has become the focus of domestic and foreign cities,modern trams have been widely used and developed rapidly due to their advantages of energy saving,environmental protection,high speed,low cost and strong adaptability to the landscape.The energy storage system and ground-power supply system are the main source of power for modern trams.Be based on ground-power supply system on line,On the premise of satisfying the power and energy requirements of trams,optimizing the configuration of on-board energy storage system and the parameters of power supply strategy can not only improve the overall efficiency of the system,but also save the cost of investment and operation,which has certain guiding significance for practical project.In this paper,the energy storage system for modern tram and power supply system on line are the main research objects,and the power supply catenary is set up in some areas of the line.Firstly,it analyzes the power flow characteristics of trams in different areas of the railway,and builds tram dynamics model and energy storage system model,based on the above model,traction calculation is carried out to obtain the data of mileage,demand power and energy consumption during the operation of single tram,which provides data basis for the analysis of multi-vehicle operation and traction power supply calculation in the following chapters.Secondly,according to the two schemes,the topology of traction power supply system in catenary-area is expounded respectively,and build equivalent model of each module of traction power supply system,based on the results of traction calculation in Chapter 2 and parameters of power supply catenary,the multi-vehicle operation analysis in catenary-area is completed,and traction power supply calculation is carried out in catenary-area of the line to obtain the electrical characteristics parameters of tram energy storage system,catenary and traction substation in catenary-area.Then,the configuration of energy storage system for tram and the power supply strategy parameters in catenary-area are taken as decision-variables,and the life cycle cost of the energy storage system and power supply system on line is taken as the objective function,Considering the constraints of catenary voltage and energy storage system voltage,current and SOC,the genetic optimization algorithm is used to obtain the power supply strategy and configuration parameters of energy storage system in the lowest cost of life cycle.Finally,research and analysis the two optimization schemes to complete the feasibility verification by stimulation of the two optimization schemes and economic comparison with the original scheme,and theoretically analyze the simulation results under fault conditions in working condition,Jinan Tram Line 1.