Contribution of a shunt active power filter control using double fuzzy PI controller

This paper presents a contribution to harmonic cancellation using a shunt active power filter (SAPF) based on a voltage source converter. The harmonic producer is a three-phase diode bridge feeding a variable DC RL load. The SAPF power circuit is constituted of a IGBTs two-level inverter and an output RL filter. The control circuit contains a hysteresis current controller and a DC bus voltage regulation loop based on a double fuzzy PI (DFPI) controller. The harmonic reference current is extracted using the algorithm of the synchronous reference frame (SRF) and the Double fuzzy PI controller allows the control of the DC voltage so that the SAPF works properly. An additional feature of the paper consists in dimensioning of the SAPF passive elements. To validate the presented work, simulation studies performed under MATLAB/Simulink are provided and a comparison between PI and DFPI controllers performances is dressed. The obtained results seem to be satisfactory and promising even under load current variation. Also, they demonstrate the advantage of a DFPI controller.