Protótipo de medidor de componentes de frequência em sistemas elétricos baseado no algoritmo anti-leakage matching pursuit

Abstract

Motivated by studies on power quality and disturbances in the electrical grid, this work consists of developing a prototype for measuring harmonic and inter-harmonic frequency components using a recent algorithm called Anti-Leakage Matching Pursuit (ALMP) on a discovery kit with a dedicated microcontroller for signal processing. Based on real sources of harmonic and inter-harmonic distortions, signals were generated and reproduced in a function generator, and acquired by the prototype, which iteratively estimates the amplitude, frequency, and phase of each frequency component present in these signals using the ALMP algorithm. For the functioning of this project, softwares and libraries were utilized on the microcontroller, such as the real-time operating system FreeRTOS, which manages the execution time of each microcontroller activity, the levmar library for solving non-linear least squares, necessary for the execution of the ALMP algorithm, and the LVGL library for the development and exhibition of graphical interfaces on LCD displays. During and after the acquisition and estimation of the signals, each frequency component and its parameters of interest are presented in a graphical interface on the discovery kit’s display, these frequency components are compared with those of the original signals, and their waveforms are verified with those ones reproduced on an oscilloscope.