Robust Control Method for Mitigating Disturbances Caused by Renewable Energy Sources in AC Railway Systems

In recent years railway section experts have concentrated on innovative solutions for increasing energy efficiency and especially on the connection of renewable energy sources (RES) into electric railway systems (ERSs). However, one of the main issues of such an integration is that increasing high-power RES connection to the railway grid will increase the probability of grid disturbances and cause instability and malfunction of devices. This paper presents a new control scheme for railway power flow controller (RPFC) to improve its dynamic and compensation performance by mitigating disturbances. A wavelet transform-based control method integrated with instantaneous reactive power theory is proposed to optimize the RPFC performance confronting the main power quality (PQ) issues of ERS. The accurate simulation results using MATLAB SIMULINK are provided to verify the theoretical analysis and reveal the performance of the proposed method.