Alternativas de mejora para un filtro no lineal adaptativo, tipo seguidor de fase (PLL) como herramienta para monitoreo de magnitud y ángulo en tensiones de nodo

Abstract

The work allows analyzing a phase lock loop (PLL) which is a controller with closed loop capable of synchronizing with an input signal. It used for control systems involving Park transform and micro-reed converters. The PLL against three (3) main parts and input signal, a filter (PD) and a voltage-controlled oscillator (VCO). We proceeded to propose modifications to an open architecture PLL, with the aim of extracting up to four signals from a waveform of voltage at industrial frequency: frequency, angular frequency, angle of offset and peak magnitude. For the verification of its operation and tuning, variations in the base frequency, 50 (Hz) and 60 (Hz), harmonics of both low and medium frequency, as well as variations in the amplitude of the waveform and DC content were used. The modified PLL acts in 0.2 (s) with a tuning of the type Kp1-LF = 10, Kp2-VCO = 10 and Kp-PD = 100 for waveforms close to 1 in per unit, slowing down with the depression of the normalized voltage. Finally, analysis is complemented by aspects related to the study of reaction of PLL to various sources of disturbance, of which the states of operation of the PLL were analyzed before problems that usually appear in its operation such as: the presence of harmonics, the increase or decrease in amplitude and the relationship that sustain the gains within the system. Which leads to an extra, which is that it will happen to the system in the presence of direct current, for performing the study and analysis of the system is, used the Simulink simulator of Matlab.