Research On Energy Optimal Timetable For Metro Lines In Urban Rail Transit Based On Heuristic Optimization Algorithm

Since the traffic volume is high and the load is very heavy,the total energy consumption of the urban rail transit is huge,and the expense is very high.With the the traction energy consumption occupying a large proportion of the total energy consumption in the operation of the train,it is really necessary and realistic to study how to reduce the traction energy consumption so that the operation cost could be reduced effectively.By optimizating the timetable of the metro line,the traction stage and the braking stage of different train are overlapped,and the regenerative braking energy of the train can be more absorbed by other trains,instead of absorbed by the braking resistance.In this way,the energy recycling ratio is improved and the traction energy consumption of the train is reduced.In this paper,the main research contents as follow:(1)analyze the principle of the Metro DC power supply system,establish the simulation model of the system by modeling every part of the system,and validate the results of the simulation;(2)analyze the principle of the timetable optimization of the metro line,optimize the timetable with the heuristic optimization algorithm,mainly including genetic optimization algorithm and particle swarm optimization algorithm.Study the principles of both of the algorithms,improve the algorithms,and display the optimization processes;(3)simulate the timetable optimization of the metro line with the computer programs of both algorithms,contrast the results of the two simulations,find out the better algorithm to optimizating the timetable of the metro line in differene period of the whole day,verify the correctness and validity of the timetable optimization;(4)analyze the effect on the energy optimization of train delay,study and verify the solutions.The simulation software is programed with the C++ computer language,Visual Studio 2010.The result of the simulation shows that energy optimal timetable can realize the reliability of traction energy saving and effect is pretty good,which supports the research of traction energy saving of urban rail transit.