Issue |
Renew. Energy Environ. Sustain.
Volume 9, 2024
|
|
---|---|---|
Article Number | 4 | |
Number of page(s) | 14 | |
DOI | https://doi.org/10.1051/rees/2023024 | |
Published online | 01 March 2024 |
Research Article
Simple solution of DC-offset rejection based phase-locked loop for single-phase grid-connected converters
TECH-NASE Research Group, Department of Chemical Engineering, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
* e-mail: pastora.bello.bugallo@usc.es
Received:
19
April
2023
Revised:
11
October
2023
Accepted:
28
November
2023
Distributed Generators (DG) systems based on Renewable Energy Sources (RES) such as hydro, wind, and solar power plants have been spread widely due to their lower cost and the advanced capability of connecting them with the grid. The power generated from the DG must be shaped to be interfaced with the grid employing power electronics converters. The grid-connected power electronics converters must be synchronized with the grid (i.e., the same fundamental component of the grid frequency, phase, amplitude, and sequence). Synchronization techniques are employed to achieve accurate and fast grid synchronization between the converter and the grid. The existence of (DC-offset) in the input of Phase Locked Loop (PLL) caused synchronization problems as it causes oscillations in the estimated fundamental grid phase, frequency, and amplitude. In addition, the closed-loop system stability can be affected. This work proposes a simple technique for grid synchronization based on PLL with a phase angle correction. The proposed method was developed using Transfer Delay (TD) and Delay Signal Cancelation (DSC) operators; then, the small single model and stability analysis was employed. Several scenarios were developed to compare the proposed method with previous methods using MATLAB/Simulink tool. The scenarios involve introducing phase jumps, DC offsets, and amplitude changes to the grid voltage. Additionally, the grid frequency was also changed. The results show that the proposed PLL can solved the DC-offset problem using any delay time and fully synchronized with the grid. Moreover, the proposed PLL has the fastest dynamic response and shortest synchronization time over the other methods from literature.
Key words: Sustainable resources / grid synchronization / DC-offset elimination / phase-locked loop / small-signal model / delay signal cancelation
© M.A. Bany Issa et al., Published by EDP Sciences, 2024
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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