Open AccessNovel orthogonal signal generator for single phase PLL applications
Author(s) -
Stojić Djordje,
Georgijević Nikola,
Rivera Marco,
Milić Saša
Publication year - 2018
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2017.0458
Subject(s) - phase locked loop , control theory (sociology) , electronic engineering , signal (programming language) , attenuation , pll multibit , generator (circuit theory) , voltage , phase detector , pulse width modulation , computer science , filter (signal processing) , power (physics) , engineering , physics , electrical engineering , phase noise , optics , control (management) , quantum mechanics , programming language , artificial intelligence
Single‐phase phase‐locked loops (PLLs) are used in various types of power electronics applications, including voltage source inverters, pulse width modulation rectifiers and different types of grid‐tied power converter utilities. The orthogonal signal generators (OSGs), used in single‐phase PLLs, are generally based on various types of filters, and they need to operate robustly in relation to the grid voltage disturbances and frequency variations. In this study, a novel OSG is proposed based on a modified first‐order all‐pass filter, which enables the PLL phase detector to operate at different response speeds, tuned by means of a single parameter. The PLL is experimentally verified and compared with a number of conventional solutions. Tests include responses to phase angle disturbances, frequency steps, and PLL input voltage distortions. Results show that a novel OSG filter enables faster PLL responses when compared with several conventional OSG filters, all designed to have the same disturbance attenuation at double fundamental frequency.