Bài viết trên cơ sở mô hình năng lượng theo vị trí, biến trạng thái được đặt là tốc độ theo vị trí và thời gian chạy tàu theo vị trí. Giá trị tốc độ tối ưu tại từng vị trí chuyển động của đoàn tàu trong khu gian được xác định dựa trên nguyên lý truy hồi của phương pháp quy hoạch động. Khu gian Cát Linh – La Thành trong tuyến đường sắt Cát Linh – Hà Đông được lựa chọn để kiểm nghiệm và hiệu chỉnh cho phương pháp đề xuất. | Transport and Communications Science Journal Vol 72 Issue 3 04 2021 317-329 Transport and Communications Science Journal OPTIMIZING THE URBAN TRAIN SPEED TO MINIMIZE THE ENERGY CONSUMPTION AND COMFORT Tran Van Khoi An Thi Hoai Thu Anh Dang Viet Phuc University of Transport and Communications No 3 Cau Giay Street Hanoi Vietnam ARTICLE INFO TYPE Research Article Received 17 11 2020 Revised 20 03 2021 Accepted 22 03 2021 Published online 15 04 2021 https Corresponding author Email Tel 0971385813 Abstract. Energy efficiency is a very important issue. Due to limited energy resources improving energy efficiency has been included in any government policy. Railway systems consume a huge amount of energy so the optimization of energy efficiency has received a lot of attention from railway operators and researchers. This paper presents a method to determine the optimal train speed at each location along railway between two stations. The goal is to minimize the total energy consumed by the train during the journey which determined by the distance of two stations and running time. Practical factors such as vertical slope curve segments tunnels speed limit sections are considered and calculated in the algorithm. In this paper the energy-distance model is used with with the state variables including of time and speed according to the distance. The proposed control variable is acceleration to actively control the value of the train s traction. Based on the built-in energy optimum control model the dynamic programming algorithm is applied to find the corresponding optimal speed at each location along the railway. The section between Cat Linh station and La Thanh station in the urban railway No. 2 Cat Linh - Ha Dong was selected to test the simulation results of the algorithm. The proposed method will optimize the power consumption of the train contributing to improving energy efficiency in the urban railway system. Keywords Urban
