Experimental Test Bench for Power Quality Enhancement Using Direct Current Control Based on Fuzzy PI Controller

The three-phase shunt active power filter (SAPF) is considered the optimal solution for addressing harmonic disturbances caused by the widespread use of nonlinear loads in electrical networks. The SAPF operates effectively by injecting a compensating current into the network, which helps to cancel out harmonic currents that negatively impact power quality. The correct generation of these compensating currents relies on the control method used for the SAPF. This research presents an experimental application of the direct current control (DCC) technique for controlling the SAPF. To ensure the effectiveness of this technique, it is essential to accurately adjust the proportional-integral (PI) controller. In this context, fuzzy logic control (FLC) is employed to fine-tune the PI parameters, thereby maintaining the DC bus voltage of the SAPF at a constant value. To evaluate the effectiveness of this technique, load conditions were varied using an experimental setup based on the dSPACE 1104 board and MATLAB/SIMULINK software. The system demonstrated a significant ability to compensate for reactive power, which is crucial for improving power quality. Furthermore, the total harmonic distortion (THD) was reduced to 4.2% in steady state, demonstrating the efficiency of the technique used.