Research on Joint Optimization of Timetable Rescheduling and Train Operation for Energy Saving Urban Rails

Way-side energy storage systems(WESS) have been proposed as an innovative and sustainable approach to net zero urban rail transportation and the timetable rescheduling plays an critical role in optimize and balance the utilization of energy from regenerative braking trains, the operation cost and passenger delays. This paper studies how to reduce the size of WESS by improving the receptivity of regenerative braking energy through the optimization of timetable and speed profile of multiple trains. In particular, this paper studies the energy efficiency in the scenario of timetable rescheduling to recover the timetable from delays, and minimizing passenger delays. Two models are developed to represent the passenger flow and the regenerative energy reuse in multi-train operation with WESS, respectively. Furthermore, three optimization objectives are proposed to reduce the operating cost of trains and passenger delays, which include minimizing the energy imported from power supply grid, minimizing the energy stored by WESS, and minimizing passenger delays. The results show that the energy imported from grid is reduced by 13.14%, and the receptivity of regenerative energy is reduced by 2.9% while the delay is reduced. The proposed method not only reduces passenger delays, but also makes the accelerating and braking trains match better.