Abstract
In the electrical power and energy (EPE) area, the traditional concept in designing the synchronization system of power converters is using the phase-locked loop (PLL) concept. An alternative way is using the frequency-locked loop (FLL) concept, which is also known as the adaptive notch filter, adaptive noise cancelation technique, gradient descent estimator, adaptive observer, D-estimation method, and transformation angle detector, among others names. Along with the increased popularity and application of FLLs in EPE systems, the misconception about this design concept is growing. To be more exact, most EPE research communities introduce FLLs as synchronization systems of different properties compared to PLLs. This article aims to explain the main reasons behind this misconception and contribute to dispelling it.
Original language | English |
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Journal | IEEE Industrial Electronics Magazine |
Volume | 15 |
Issue number | 4 |
Pages (from-to) | 54-64 |
Number of pages | 11 |
ISSN | 1932-4529 |
DOIs | |
Publication status | Published - 1 Dec 2021 |
Bibliographical note
Copyright:Copyright 2021 Elsevier B.V., All rights reserved.
Keywords
- Detectors
- Frequency locked loops
- Low-pass filters
- Phase locked loops
- Power harmonic filters
- Synchronization
- Voltage-controlled oscillators