Adaptive PI Control Strategy Based on Fuzzy Logic for an Active Harmonic Compensator

Abstract

This paper presents an improved version of direct power control (DPC) applied to the shunt active power filtering system (SAPF). By using the adaptive proportional-integral (PI) control strategy in the dc-link voltage, the improvement is realized by tuning online with a fuzzy logic approach. The main goals are to reach a minimum of dc voltage error during the transient state and assuring a reactive and harmonic compensation in the power grid. Many topologies of DPC strategy are studied in the literature exploiting a simple PI controller. However, due to its fixed parameters, this conventional controller does not work satisfactorily under variable load conditions. This work is deal to investigate the better improvement of dynamic performances and maintain a high power quality of the filtering system. In order to verify the effectiveness of the adaptive PI strategy, computer simulation has carried out under Matlab/Simulink software. The proposed control strategy proves that the system could manage the harmonic compensation and reactive power transfer in an adjustable and dynamic manner.