Abstract
The low harmonic distortion and reduced switching losses are the advantages of using the multilevel inverter. For this purpose, the three-level inverter is used in this paper as a three-phase four-leg shunt active power filter (SAPF). The SAPF is used to eliminate the harmonic current to compensate the reactive power current, and to balance the load currents under an unbalanced non-linear load. A fuzzy logic controller and self-tuning filters (STF) are used to control the active power filter (APF) and generate the reference current. To demonstrate the validity of the proposed control strategy, we compared it with a conventional p − q theory, under distortion voltage conditions and unbalanced non-linear load. The Matlab-Simulink toolbox is used to implement the algorithm of Fuzzy logic control. The performance of the SAPF controller is found very effective and adequate as compared with the p − q theory.
Highlights
A connection of non-linear loads to the network, such as power electronics equipment in industrial activities and public consumers, causes an increase of current and voltage harmonics and leads to a lower power factor
The three-level inverter is used in this paper as a three-phase four-leg shunt active power filter (SAPF)
Two levels of APF are widely used to decrease harmonics and compensate the reactive power [1,2,3], these active power filters are limited in medium power domains
Summary
A connection of non-linear loads to the network, such as power electronics equipment in industrial activities and public consumers, causes an increase of current and voltage harmonics and leads to a lower power factor. This causes adverse effects in power systems, such as equipment overheating, motor vibration, excessive neutral currents. The instantaneous reactive power theory (IRP), presented by Akagi et al [7, 8], has been successful to control the APF in 3-phase It was extended by Aredes et al [9], for applications in 3-phase 4-wire systems. Simulation results demonstrate that the proposed scheme was found practical and good
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