Open AccessAdaptive spline‐based PLL for synchronisation and power quality improvement in distribution system
Author(s) -
Saxena Hemant,
Singh Alka,
Rai Jitendra Nath
Publication year - 2020
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2019.0662
Subject(s) - phase locked loop , harmonics , control theory (sociology) , computer science , electronic engineering , pll multibit , spline interpolation , power quality , spline (mechanical) , voltage , engineering , phase noise , artificial intelligence , electrical engineering , structural engineering , computer vision , bilinear interpolation , control (management)
A new type of non‐linear adaptive phase‐locked loop (PLL) has been proposed here, which is based on spline interpolation. The study discusses the method of cubic spline, which is used to extract the fundamental voltage component, its phase angle and frequency. Test results under varying grid conditions viz. normal and distorted conditions such as the presence of harmonics, noise, phase and frequency variations etc. are presented for the developed PLL. An application of the proposed PLL to power quality improvement of grid current using shunt active power filter is further discussed here. The study demonstrates that the spline‐based controller can be effectively employed as a PLL and to achieve improvement in the power quality of a three‐phase, three‐wire power distribution system.