Three-level (NPC) Series Active Filter based on Fuzzy Logic Voltage

Abstract

This paper presents a new control scheme for threephase three-wire series active power filter to compensate all load
voltage perturbations: harmonics unbalances sags and swells.
The conventional configuration of three-phase series active
power filter is based on the two-level voltage source inverter
with classical controllers requiring a complex and a complicated
mathematical model. In order to overcome these drawbacks and improve the APF there is a great tendency to use multilevel converters based on intelligent technique controllers. Today three-level inverter topology and fuzzy logic controllers are
successfully employed in various industrial applications; in
order to get benefits of their advantages a new control scheme for series active power filter is proposed in this paper. The fuzzy
voltage controller is designed to improve compensation capability of active power filter by adjusting the voltage error
using a fuzzy rule. The control strategy use instantaneous
reactive power theory easy to implement and gives a good performances. The numerical simulation results, using MATLABSimulink and SimPowerSystem BlockSet Toolbox, from complete
structure including control and power circuits are presented and discussed.