Energy-saving Optimization Of High-speed Train Operation Based On Firefly Algorithm

Railway is an important infrastructure for people's livelihood,which provides vital public transport service to society for many years.In recent years,the high-speed railway develops rapidly with many advantages such as comfort,cleanliness and time-saving,and the proportion of passenger transport capacity of the EMU has increased year after year.Therefore,the high-speed railway is expected to become the preferred travel mode for passengers in the future.With the continuous development of this trend,the energy consumption of high-speed railway is in a sharp rise.Nowadays,Chinese government vigorously advocates energy conservation and emission reduction measures to strive for a harmonious situation of coordinated progress between economic development and ecological environment.Therefore,it is of great significance to carry out relevant research on the energy-saving operation mode of high-speed trains.On the basis of the theory of train dynamics model,this thesis takes the train conrol switching as the main line,and proposes the train energy-saving operation strategy to optimize the speed on the switching point of control conditions.The main work of the thesis includes four parts.(1)Firstly,the train is regarded as a single-mass model,and then,the dynamic model of the train is established.Based on it,the relationship among speed,acceleration,operation time and distance during high-speed train operation process is analyzed and calculated.(2)Secondly,the basic theory of the firefly algorithm is introduced,and the optimization performance of the firefly algorithm is verified.In addition,on the basis of analysis of the main flow of EMU energy consumption,this thesis proposes the optimization strategy for energy-saving operation mode of high-speed train,which aims at reducing energy consumption.(3)Thirdly,according to the analysis of train operation state,the mathematical model of energy-saving optimization of single train is established.Then,the firefly algorithm is applied to optimize the speed of the high-speed train on the switching point of control conditions,a set of control switching speed sequence under the situation of lowest energy consumption is searched,and then,the energy-saving operation curve of high-speed train is simulated.Finally,by comparing the values of different indexes of the curves of time-saving operation and energy-saving operation,the value of the index of energy consumption of train decreases under matching the conditions of on-time parking,precise parking and safe operation,thus verifying the effectiveness of the firefly algorithm.(4)Fourthly,the working principle of the moving block system is introduced,then,tracking train operation model of the moving block system is established,thus calculate thesafety interval between two trains.On the basis of the model of single train,the model of energy-saving optimization for tracking train is established,and the firefly algorithm is applied to optimize the mathematical model.By comparing the operation indexes of tracking train before and after optimization,it is verified that the firefly algorithm has a good effect on energy-saving under the constraints of safe distance between two trains,timely arrival and accurate parking.