Experimental Test Bench for Direct Current Control Strategy in a Three-Phase Shunt Active Power Filter Based on IP Controller

Active power filtering presents a bright solution in compensation of reactive power and decreases harmonic currents, thus improving the grid energy quality. Filtering process is based on detecting and compensating reactive currents and harmonics in real-time. Active power filters use advanced control strategies and algorithms to inject compensating currents. These currents successfully cancel out the undesired harmonic currents, leading to a more stable and cleaner power supply. This research paper presents an experimental study of an integral plus proportional (IP) controller, implemented to maintain the DC bus voltage of a three-phase Shunt Active Power Filter (SAPF) at a constant value based on a direct current control strategy. This strategy demonstrates its efficiency with good results. THD value has decreased to 4.7% meting the IEEE 519 standards. The same performs are maintained in cases of sudden transient load change. Moreover, an excellent transient performance, demonstrating the robustness of the IP controller in the control strategy. The experiment results were carried out by using a dSPACE 1104 board with the help of MATLAB/SIMULINK software.