Studies Of Energy-Saving Optimal Operation Strategies Of High Speed Train

The development of high-speed railway is facing the situation of opportunities and challenges. It is able to stimulate the economic growth and facilitate the passengers. Meanwhile, huge energy consumption has become an important issue that can not be ignored. The energy-saving operation of high speed train for the energy-saving running with punctuality has important significance, at the same time for our country to realize the Automatic Train Operation (ATO) technology has also had a profound influence.This thesis mainly researches the off-line optimization problem of high-speed train. Off-line optimization needs to meet the requirement of punctuality and the track profile, facilities, speed limits and the EMU characters constraints need to be considered. On this basis, the energy-saving optimization trajectory and operation sequences are generated. Off-line optimization usually takes a long calculation time. Therefore, rapid and accurate calculation of the energy-saving optimization curve for the high-speed train is the main research goal of this paper.First of all, the traction calculation model is founded on the basis of the traction calculation principle of high-speed train and the characteristic curves of the EMU, then the optimization mathematical model is established. By using the maximum principle to analyze this problem, the set of operation modes is concluded, the application conditions of constant speed modes and the changing rules of the co-state variables are summarized.Based on the optimization model, this paper combined the maximum principle and the classified discussion method to summarize the optimal switching strategy among operation modes with the speed limit and without the speed limit constraints respectively. The optimal switching strategy contains all possible switches among 5 kinds of modes including 9 kinds of switches when the co-state variable is continuous and 12 kinds of switches when the co-state variable has a positive jump.On the basis of the above theoretical analysis, this thesis combined the Indirect Method with the Direct Method, and proposed the energy-saving search algorithm. By putting forward the concept of Typical Energy-saving Section, the range of feasible solution and the energy consumption characteristics of the Typical Energy-saving Section are analyzed. Afterwards, the process of the energy-saving optimization search algorithm in the whole section is proposed in this thesis.At the end of the thesis, two sets of simulation are carried out by using the actual EMU and railway line. The accuracy of the algorithm is verified under different speed limits and different target time constraints. Finally, the search algorithm is compared with the other two algorithms, and the simulation results show that the search algorithm has a good energy-saving effect and high computational efficiency.