Power factor correction of sigle phase AC-DC converter

Abstract

This study presents the analysis, a modeling approach to obtain a small-signal model, design and the Matlab/Similink implementation of a linear control technique for single-phase boost power factor correctors (PFC). Such converters present nonlinear characteristics and an approximation of them are used to drive the models. The most important result obtained is that the small-signal output is not equal to the load impedance. The proposed circuit significantly improves the dynamic response of the converter to load steps without the need of a high crossover frequency of the voltage loop by adding low-pass filter, so that a low distortion of the input current is easily achieved in PI-PI Control for Active Power Factor Correction. After that, a modeling approach to obtain a small-signal model and the simulation of a PI controller in the loop voltage and two controllers in the loop current based on a standard fixed and sinusoidal band hysteresis control, followed by a variable band hysteresis control for a single-phase power factor corrector (PFC). Finally, a fuzzy logic controller in the loop voltage and hysteresis controller in the loop current for a single-phase power factor corrector (PFC)