Optimal PV-storage capacity planning for rail transit self-consistent energy systems considering extreme weather conditions

With the rapid development of electrified rail transportation, the traction load demand of rail transportation has increased sharply, and its operational security under extreme conditions has been highlighted. Given the above background, this paper proposes a planning method for the optimal photovoltaic (PV)-storage capacity of rail transit self-consistent energy systems considering the impact of extreme weather. First, the basic structure of a rail transit self-consistent energy system is presented. Second, considering a power transmission system with line trip-off under extreme weather conditions, a traction load reduction model is established to obtain the maximum power exchange capability between the power transmission network and rail substations. Subsequently, an optimal planning model for a hybrid energy storage system (HESS) is proposed to minimize the total HESS investment and rail transit system operation costs. Finally, the model is linearized as mixed-integer linear programming and solved using Gurobi and the Yalmip toolbox. The simulation results verify the effectiveness of the proposed optimal PV-storage capacity planning for rail transit self-consistent energy systems. First, the basic structure of a rail transit self-consistent energy system is presented. Second, considering a power transmission system with line trip-off under extreme weather conditions, a traction load-shedding model is established to obtain the maximum power exchange capability between the power transmission network and rail substations. Subsequently, an optimal hybrid energy storage (HES) planning model is proposed to minimize the total HES investment and rail transit system operation costs. image