Three-level (NPC) shunt active power filter based on fuzzy logic and fractional-order PI controller

Abstract

In this paper, a three-level neutral point clamped (NPC) shunt active power filter is proposed which injects into the network a current equal to that absorbed by the polluting load, but opposed to the phase. Thus, it is designed to prevent current disrupters of pollutants to flow through the impedance of the network making the sinusoidal network side current. The three-level neutral-point-clamped (NPC) inverter hysteresis-based control shunt active power filter offers enormous advantages compared to the two-level inverters. The regulation and the stability of the DC voltage across capacitor of the power supply filter during transient states and under various operating conditions is ensured by fuzzy logic controller and then by a fractional order proportional integral (PI) controller. A comparative study was carried out and the comparison criteria are the total harmonic distortion (THD) in the current line and the stability of the voltage during the load variation. The obtained results showed the efficiency of the proposed shunt active filter based on a three-level inverter (NPC) using a fractional order controller.