A New Approach to Extract Reference Currents for Three-Level Shunt Active Filter in the Systems Electric

This paper presents a new approach to Extract Reference Currents for Three-level Shunt Active Filter controlling by fuzzy logic. This active power filters (APFs) are used to compensate harmonic currents generated from the nonlinear loads. The APF is realized using three phase voltage and the carrier-based PWM strategy the latter is used to derive gating signals for the IGBTs. A new approach for identifying reference currents will be developed. It is based on Concordia method using multi-variable filter, and makes the total or selective extraction harmonic currents of references, and by consequence making their compensations, total or selective.

The results of digital simulation in the Matlab-Simulink environment of a system of power PD3 to thyristor outputs on an inductive load show well the effectiveness of this new technique of extraction of the harmonics of reference.