Harmonic Elimination of AC Electric Railway Systems Using Shunt Active Power Filters

This article presents the power quality improvement in an AC electric railway system by harmonic elimination using the shunt active power filter. The shunt active power filter's reference current is calculated using the synchronous detection with Fourier analysis (SDF) method. The fuzzy controller is used to regulate the current of the shunt active power filter. The article also presents a method for designing fuzzy controllers that is simple to calculate and does not require a mathematical model of the system. The Simulink/MATLAB program was used to model the AC electric railway system with harmonic reduction by the shunt active power filter. The results confirmed that the Fuzzy controller created by the proposed method performs better than the PI controller for controlling the compensating current. Moreover, the shunt active power filter can reduce current harmonic in the AC electric railway system. The percentage value of total harmonic distortions (%THD) after compensation of the source currents is decreased and follows the IEEE standard 519–2022.