Emulação de indutância em circuitos retificadores de potência

Abstract

This work proposes the replacement of a real inductor with an electronic circuit that emulates an inductance in single-phase and three-phase rectifier circuits with RL loads, used in the power electronics discipline of the undergraduate electrical and electronic engineering courses at the Federal University of Technology - Paraná, Cornélio Procópio campus. The Antoniou circuit is composed of operational amplifiers (op-amps), resistors, and a capacitor. The adopted methodology combined theoretical analysis, simulations in LTSpice software with ideal and real op-amps, and experimental laboratory tests. Due to the saturation of the op-amps, the original circuit was adapted by inserting class B power amplifiers at the op-amps' output. The results demonstrated that the emulated inductance satisfactorily reproduces the behavior of a conventional inductor, presenting similar waveform shapes and maximum, minimum, average, and RMS values for voltage and current when comparing the theoretical and experimental cases, considering both the real inductor and the emulated one. Considering the cost and difficulty in acquiring/manufacturing a real inductor, as well as its weight and volume, despite the need for a symmetric DC voltage source, the use of the emulated inductance proved to be a promising alternative for implementation in power rectifier circuits analyzed theoretically and experimentally in the power electronics discipline.