Regulating Method For Metro Train Energy Saving Based On Regenerative Braking Process Prediction

At present,the automation level of urban rail transit has been gradually improved.The urban rail transit control system has also been upgraded from manual driving to automatic driving.The fully automated driving mode has been applied to some lines,and the train running status can be effectively determined.In some urban rail lines,the energy-saving control of the single train is considered,by optimizing the speed-distance curve of the single train.In the field of multi-trains cooperative energy-saving,the current research realizes the utilization of regenerative braking energy through the optimization of schedule.While trains often deviate from the schedules more or less,the train dispatching is needed to achieve energy-saving.In this paper,a multi-trains coordinated regenerative braking energy utilization method is studied for urban rail transit.This method predicts the regenerative braking process,and then finds the outbound traction in the same or adjacent power supply section of the train.Under the restraint of meeting the needs of passengers and trains,the traction train absorbs the regenerative braking energy from the brake train by adjusting the departure time constantly.The specific studies are as follows:Firstly,multi-objective adjustment method of subway trains based on multi-trains coordination is modeled and solved.When a train is under the mode of automatic train operation in the interval,the states of train operation are predictable.For each predicted train braking,it adjusts the departure time of the traction train constantly by matching the traction with braking to make full use of the regenerative braking energy,so that the regeneration energy utilization rate can be improved and the total energy consumption can be reduced.Secondly,during the process of regenerative braking matching,the stopping time to be adjusted is affected by many kinds of passenger factors,such as the waiting on the platform,the distribution of passengers and the passengers disembarking.At the same time,it is affected by the stochastic factors like platform screen doors,train doors and signal system.There will be quite a few constraints leading that the matches cannot be optimal.Considering that it is usually difficult for the trains to stop on schedule.Instead,the running plan that trains usually stop by is within a range of the train schedule.Therefore,the regenerative braking matching involves the continuous analysis of the traction braking process,and generates the absorption regenerative braking energy utilization curve to realize the suboptimal results when the model cannot obtain the optimal solution or the scene needs,thus realizing the overall energy saving.Up to now,some scholars analyze the matching absorption of single-trains and single-brakes trains when the regenerative braking process is used.In this paper,the regenerative braking energy curves of single-trains with multi-trains are considered and optimized under random factors energy-saving adjustment method,and the algorithm simulation is verified.Finally,based on the energy-saving adjustment method with the prediction of regenerative braking process,a dynamic simulation software for subway train is established on the NET platform.The module realizes the function of train operation diagram matching search,train simulation operation,train running curve optimization and regenerative braking energy utilization evaluation.The actual line data of Beijing Subway Line 4 is used to complete the train energy-saving adjustment simulation operation.