Five-level (NPC) shunt active power filter performances evaluation using fuzzy control scheme for harmonic currents compensation

This paper present the performances of five-level (NPC) shunt active power filter based on fuzzy control approaches which can mitigate current harmonics generated by nonlinear loads. Five-level inverter is strongly used in the medium and high voltage applications; these advantages are low harmonic distortions, low switching losses, low electromagnetic interference, low voltage stress of power semiconductors and low acoustic noise. On the other hand fuzzy logic has been widely used in various industrial applications. To benefit from these advantages a novel control scheme based on fuzzy logic is proposed. The reference current signals required to compensate harmonic currents use the synchronous current detection method. Proportional integral voltage controller is used to maintain the dc voltage across capacitor constant and reduce inverter losses. The simulation is performed using Matlab-Simulink and SimPowerSystem toolbox. The results obtained under various operating conditions show the effectiveness of the proposed shunt APF system.