Research On Comfortable And Energy-efficient Operation Control Of Intercity Trains

With the rapid development of highly integrated city cluste,the population flow between cities has accelerated,and intercity trains have become an ideal means of transportation between cities.Due to insufficient attention to the standardization and automation of intercity train in the early process,there are have not optimized the train speed curve for energy saving in most of the intercity railway systems in operation,which affects the energy saving.The switching of the control level is frequent in the operation,causes frequent changes in force,which affects the comfort.Therefore,improving the energy saving and comfort of intercity train in operation has become a key issue in train operation control research.This thesis dissects the problem of comfortable and energy-efficient operation control of intercity trains into two sub issues: optimization of energy-efficient operation of intercity trains and train speed tracking control considering comfort.Through operation optimization,the global energy saving of the train under the punctuality can be achieved.Accurate tracking of energy-efficient speed curves is achieved through speed tracking control that takes comfort into account.Firstly,this thesis studies the optimization of energy-efficient operation of intercity trains.In order to realize the discretization of complexity lines,the concept of “sub-segment”was proposed and the division method was given.In order to reconstruct the high-dimensional and non-linear train energy-efficient operation optimization model into a standard mixed integer linear programming model,the piecewise affine transformation function with variable coefficients was designed,logical variables and auxiliary variables were introduced.In order to optimize the speed curve of the single section of the train,the solution space is determined based on the optimal energy-efficient operation theory.In order to realize the synchronous optimization of multi-section speed curve and timetable of trains,the station is regarded as a special sub-section and the constraint of multi-section running time is introduced.The solution process is designed,and the matrix that can be generated offline is pre-stored,which improves the optimization solution efficiency and obtains the train energy-efficient speed curve and timetable allocation plan.Secondly,this thesis studies the speed tracking control of intercity trains.To ensure accurate tracking of optimized speed curves to achieve energy savings,intercity train speed tracking control model was established,an iterative learning law was designed,and a method for generating the first control sequence was designed.A discrete level output method was designed for intercity trains with discrete level control.In order to improve the comfort of train operation,this thesis designs the evaluation index of comfort in operation and proposes two intercity train comfort control strategies of level holding and stepwise switching based on this index,and introduces them into the speed tracking controller.Train speed tracking control considering comfort is implemented.Finally,the actual operating environment of the Guanghui Intercity Railway in China was selected,and the optimization method for energy-efficient operation of intercity trains and the train speed tracking control method considering comfort were simulated and compared with the actual operation data.The optimization of single-section speed curve can achieve energy saving rate of 6.1%,multi-section speed curve and timetable synchronous optimization further achieves a 2.0% energy saving rate based on single-section optimization.The method of train speed tracking control considering comfort compared with real operating data,can achieve energy saving rate of 4.1%.The method can improve the train comfort by up to 87% based on the analysis of the evaluation index of comfort designed in this thesis.The thesis realized the comfortable and energy-efficient operation control of intercity trains.