Improvement of the Railway Power Flow Controller’s Performance Using Sliding Mode Control Method

Railway power conditioners (RPCs) are familiar as a power electronics compensator in electric railway power systems (ERPSs). Due to the variable with the time features of electric railway loads, to improve the performance and stability of the RPC against changes, nonlinear control is a good option. In this paper, due to the importance of exact circuit modeling, an accurate modeling strategy based on space-state model (SSM) and dynamic switching pattern is proposed. Deriving the extracted equivalent model and mathematical equations, a sliding mode control (SMC) system according to the exponential reaching law in the dq frame is adopted. Finally, the presented control method is simulated for V/V transformer by Matlab/Simulink software. The simulation results are provided to reveal that the proposed strategy is very effective.