| Recently,along with the economic development of our country and the urgent need of the society for convenient travel,the construction of urban rail transit projects has begun in various places.Energy consumption is one of the key problems that need to be considered in project operation and management.Regenerative braking is a braking method that is used to convert the kinetic energy of the train into electrical energy to the contact net when the train is braking.The energy consumption of train operation is heavy and the use of regenerative braking can save energy.However,the utilization rate of regenerative braking energy is still generally low at present.How to increase the utilization of regenerative braking energy so as to reduce the operating cost of urban rail transit and meet the national requirements for energy saving and emission reduction through optimizing the operation of subway trains and rationally applying the existing regenerative braking energy absorption and utilization technologies is particularly important.This paper makes thorough research on the key technologies for energy conservation of subway train operation,and the main research contents are as follows:(1)Study and analyze the force condition and traction strategy of subway trains.Combined with the Changzhou Metro Line 1 project data and the performance parameters of B-type subway train,the energy consumption model of trains is built based on the dynamic analysis of subway train operation.Then the energy consumption and renewable energy characteristics of subway trains are studied and analyzed.(2)The working principle and system composition of the DC traction power supply system of the subway is studied.An equivalent DC traction power supply system model was built through the MATLAB/SIMULINK simulation platform.Combined with the energy consumption model of subway train operation,the utilization of regenerative braking energy is studied at different times during the day when multiple trains are in operation.Then,the energy saving method in subway train operation is proposed that reasonably optimizing and adjusting the schedule of train operation.(3)The optimization plan of the operation schedules is studied.The calculation method of the "traction-braking" overlap time during the regenerative braking between two adjacent subway trains is studied.Taking into account the complexity of the overlapping time calculation during regenerative braking of multiple trains across the board,a multi-train schedule optimization model based on genetic algorithm is built.Examples show that comparing the energy consumption of the train running according to the original hypothetical schedule,the energy consumption of the train running according to the optimized schedule is effectively reduced.Moreover,the utilization rate of the regenerative braking energy is improved.(4)Combined with the actual line of the project,the layout of the inverter feedback device is studied.The economy under different layout principles is evaluated through the comparative analysis of the energy-saving effects of inverter feedback devices under different site selection principles.Moreover,the factors that affect the energy-saving effect of the inverter feedback device are analyzed.Finally,the whole research process is summarized,and the shortcomings and deficiencies are analyzed,which provide direction for the further improvement of the research work. |
