| Due to the increase of the mileage and the traffic density in high-speed railway(HSR),the power consumption of traction power supply system(TPSS)has increased year by year,and massive energy consumption(EC)cannot be ignored.The issue of energy conservation and consumption reduction has become a hot spot of concern.There are many EC links with different energy characteristics in the TPSS of HSR.Therefore,it is of great research significance to establish a system-wide energy consumption model and reveal its energy dissipation characteristics and flow laws,and then propose effective energy conservation and consumption reduction measures.Firstly,the energy coupling model of EMU and TPSS(train network coupling system)and its energy consumption analysis method are studied.Combined with the topology and energy transmission path,the TPSS is divided into two parts: traction power supply network and traction load(EMU).For the traction power supply network,according to its topology and the operating characteristics of each equipment,a mathematical EC model including the public power grid,traction substation and traction network is established.The EC model of EMU is established by analyzing the force situation and motion equation.On these bases,combined with the electromechanical coupling and energy coupling characteristics,the train network EC coupling model is established.According to the power flow analysis method of the TPSS,the EC calculation method of the train network coupling system is introduced,and simulation examples verify the correctness of the modeling method and the analytical method.Then,the EC characteristics of the train network coupling system are analyzed,and the key factors affecting the overall EC of the system are discussed.Combined with the train network coupling model,the influence of power supply network parameters and operating parameters on the EC of the TPSS is discussed.The analysis results show that the key factors affecting the EC of the TPSS in HSR are the running speed trajectory and regenerative energy.Next,the energy saving method based on the trajectory optimization of the EMU is studied.The constant speed operation strategy of the EMU is described.Combined with the rules of each operating condition and the running process during changing segment,the traction calculation method of the EMU in the interval operation is analyzed.The control parameterization method is applied to transform the optimal control problem into a nonlinear programming problem,and the target speed sequence of the interval operation is established according to the optimization results.Combined with the traction calculation algorithm,the optimization of the running speed curve of the EMU is realized.Based on this,the load calculation of the whole line in a single-day is realized,combining the train time table.The results of the example show that the operation optimization strategy can reduce the total EC of the system by 10.5%.Last,the efficiency improvement method based on the optimal configuration of the regenerative energy storage system is studied.It analyzed the regenerative energy characteristics from the aspects of generation position and residual regenerative energy characteristics.Then,the structure of the ground energy storage system with a power supply arm as one unit and the ultra-capacitor energy storage medium is studied.Combined with the operation strategy of the energy storage system and economic efficiency as the optimization goal,a nonlinear optimization model of parameter configuration for the energy storage system is established.The two-layer optimization algorithm combined with a genetic algorithm and algorithm solver is used to solve the optimal parameter configuration of the energy storage system.Finally,the simulation example is used to determine the location and parameter optimization scheme of the regenerative energy storage system,which effectively improves the energy efficiency of the TPSS by 1.5%. |
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