Coordinative Operating Strategy of Grid-Interactive FTPSS-HST for Cost-Efficient Operation

The expansion of high-speed railways (HSR) has led to a surge in railway electricity demand, especially in Europe and East Asia. To address this issue, traction-power-supply systems (TPSS) that consist entirely of railway loads, are being upgraded to flexible-TPSSs (FTPSS) that incorporate distributed energy resources (DER). Since high-speed trains (HSTs) have the potential to enhance the system flexibility by utilizing their controllable power, integrating HSTs and FTPSS presents an opportunity to further improve the system economy and flexibility. In this paper, FTPSS and HSTs are integrated to form a grid-interactive railway power system for the first time. Further, the coordinative operation including trajectory control of HST and energy management of FTPSS is proposed. To improve the cost-efficiency rate, a microscopic kinetic-electric model of HST is established to characterize its energy conversion process and dynamic power. Additionally, the time-domain model of the system is transformed into the space-domain model using state transformation according to HST displacement. On this basis, the hp-adaptive spatial-pseudospectral method is developed. This method can capture the spatiotemporal conditions of the power and railway systems and is suitable for the operating characteristics of HST. The real-data simulation verifies that the proposed method significantly improves the economic benefits of HSR operation under grid interactive operation.