| In recent years,with the rapid development of China’s high-speed railway,the existing train dispatching and command system are mainly based on manual rescheduling and operation,which is a bottleneck of improving the performance of the high speed railway.The introduction of the optimization algorithm to generate the phase plan has become a technology development trend of the high-speed railway dispatching command system.In order to verify the security and reliability of the optimization algorithm and evaluate the performance of the optimization algorithm,it is necessary to carry out the preliminary simulation verification of the optimization algorithm.However,due to various factors such as safety,the train rescheduling optimization algorithm cannot be pre-tested on actual high-speed railway systems.Therefore,there is a need for a simulation platform with the ability of dynamic interaction,which can simulate the operation process of high-speed railway network under emergencies realistically and quickly,and providing support for the research and evaluation of high-speed railway rescheduling algorithm.The existing high-speed railway operation simulation platforms can be divided into three categories:microscopic,macroscopic and mesoscopic simulation platform,which used to simulate the operation of trains in the section.However,at present,most of them are macroscopic or microscopic simulation platforms.There are few special mesoscopic simulation platforms dedicated to high-speed railway rescheduling at home and abroad.Most of the simulation platforms are simulations of the macro,overall or micro,and local operation of the train in the operating section.Usually,the simulation of the train under normal conditions,and the operation scenario is relatively single.On the other hand,the existing simulation platform is lack fast "machine machine" interaction ability,which can not meet the needs of accurate simulation of train operation time and research of intelligent rescheduling algorithm of high-speed railway in the scene of speed limit.In order to solve the above problems,a mesoscopic and efficient high-speed railway network operation simulation system is needed to provide an excellent simulation and verification platform for high-speed railway rescheduling optimization algorithm.Based on the open source railway dispatching software Train Director,a mesoscopic simulation platform for high-speed railway for intelligent dispatching is established in this paper.In order to solve the inaccuracy of the traction/braking model in the Train Director,this paper analyzes the force on the train based on the single mass point mechanism model of the train,and then obtains the operation model of the train under the traction/braking conditions combined with the actual traction/braking data of the Railway Bureau.Considering the simulated train needs to operation according to the stage plan,this paper proposes an intelligent dispatch-oriented high-speed train section operation strategy,which aims to simulate the dynamic operation and temporary speed limit of the following train sections,based on train traction/model braking.The main achievements are contributions as follows:(1)The simulation modeling of train traction/braking condition established driven by mechanism and data.For the case where the mechanism of train traction/braking is clear but the parameters are unknown,a mechanism and data-driven modeling method is adopted.According to CRH3 80AL EMU,this paper analyzes the train force under traction and braking conditions,and establishes the parameterized operation model of CRH380AL EMU under traction and braking conditions by using the single mass point model of the train.According to the actual data,the parameters of the traction running model and the braking running model are obtained by nonlinear fitting,and the accurate simulation of the acceleration and deceleration running curves of CRH380AL EMU at various initial and final speeds is achieved.Through the simulation experiment,it is proved that the error between the model and the actual train operation in the traction/braking section is small.It can accurately simulate the train operation in the traction/braking section.(2)The train operation strategy is dynamically generated under temporary speed limit.The essence of traffic dispatch is to ensure the normal organization of train transportation by formulating phase adjustment plans,reducing or increasing the train’s interval running time,and so on.On the other hand,The temporary speed limit will also cause the change of interval operation time.Therefore,this paper constructs a method of how to dynamically generate the train operation curve according to the interval operation time given in the new stage adjustment plan and the train traction/braking model under the consideration of temporary speed limit.According to the information of speed limit in the train’s highest operating speed zone,determine the operating conditions of the train in each speed limit zone,and adjust the train’s maximum operating speed to control the train to run on the line according to the stage plan.The generated train section operation curve is determined by train arrival/departure time,the speed limit of train and section.A train operation strategy is proposed based on the fastest speed operation strategy and the above traction/braking model,and it can accurately reflect the relationship between the train running speed position and time under the existing stage plan,and realize the accurate simulation of the process of train running(including the block section occupation,etc.).(3)Secondary development of the original open source simulation software is carried out,and a mesoscopic simulation platform for intelligent rescheduling is established.According to the train traction braking model and train interval operation strategy,the optimized design of the train simulation operation module is completed.The function of controlling the train’s operation in the section according to the above train traction/braking model and the specified section operation time has been basically realized.Some simulation case are established on the improved simulation platform.The simulation results show that the improved simulation platform can accurately simulate the train traction/braking conditions and the operating status under different interval operation strategies,and achieved the design requirements that the train to adjust the plan according to the stage,and output information of train operation in real time.In conclusion,this paper constructs the train traction/braking operation model based on the single mass point model and the actual train traction/braking operation data.According to the above operation model and the existing train operation strategy,a strategy of train operation under temporary speed limit is proposed.Based on the opensource simulation software and the above strategy,a high-speed railway meso simulation platform for intelligent rescheduling is developed,which realizes the simulation of train operation in the stage plan.It solves the problem of accurate and fast simulation of highspeed railway operation in complex road network,and provides a solution and simulation platform for obtaining state information of high-speed railway lines for the verification of rescheduling algorithm. |
