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CSEE Journal of Power and Energy Systems 2022, 8(1): 155-164 https://doi.org/10.17775/CSEEJPES.2019.02390
Open Access | Issue | Published: 13 February 2020

Comparative Study of Single-phase Phase-locked Loops for Grid-connected Inverters Under Non-ideal Grid Conditions

Show Author's Information Jinming Xu( ),  Hao Qian,  Shenyiyang Bian,  Yuan Hu,  Shaojun Xie
Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
Keywords:
overview, Grid synchronization, non-ideal grid condition, single-phase phase-locked loop (PLL)
Cite this article:
Xu J, Qian H, Bian S, et al. Comparative Study of Single-phase Phase-locked Loops for Grid-connected Inverters Under Non-ideal Grid Conditions. CSEE Journal of Power and Energy Systems, 2022, 8(1): 155-164. https://doi.org/10.17775/CSEEJPES.2019.02390
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Abstract Full text About this article

In renewable power generation systems, ensuring the synchronization of the inverter and the power grid is crucial for the stable operation of grid-connected inverters. Nowadays, the phase-locked loop (PLL) technology has become a widely used grid synchronization method because of its simple implementation and robustness under various grid conditions. Even though a lot of PLLs have been proposed, an overview and comparative analysis of multiple PLLs can be helpful for practical applications. In addition, the weak grid condition is a great challenge for the system. Therefore, this study first presents an overview of the existing PLLs together with their general structures and basic working principles. Depending on the implementation of the phase detector, the PLL can be divided into three categories: power-based PLL (pPLL), orthogonal-signal-generator-based PLL (OSG-PLL) and adaptive-filter-based PLL (AF-PLL). Then, from the above classification, seven typical single-phase PLLs are selected for further study. Finally, some test results are given, and a comprehensive evaluation of the selected PLLs under different grid conditions is conducted.


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About this article

Comparative Study of Single-phase Phase-locked Loops for Grid-connected Inverters Under Non-ideal Grid Conditions

Show Author's information Jinming Xu( ), Hao Qian, Shenyiyang Bian, Yuan Hu, Shaojun Xie
Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China

Abstract

In renewable power generation systems, ensuring the synchronization of the inverter and the power grid is crucial for the stable operation of grid-connected inverters. Nowadays, the phase-locked loop (PLL) technology has become a widely used grid synchronization method because of its simple implementation and robustness under various grid conditions. Even though a lot of PLLs have been proposed, an overview and comparative analysis of multiple PLLs can be helpful for practical applications. In addition, the weak grid condition is a great challenge for the system. Therefore, this study first presents an overview of the existing PLLs together with their general structures and basic working principles. Depending on the implementation of the phase detector, the PLL can be divided into three categories: power-based PLL (pPLL), orthogonal-signal-generator-based PLL (OSG-PLL) and adaptive-filter-based PLL (AF-PLL). Then, from the above classification, seven typical single-phase PLLs are selected for further study. Finally, some test results are given, and a comprehensive evaluation of the selected PLLs under different grid conditions is conducted.

Keywords: overview, Grid synchronization, non-ideal grid condition, single-phase phase-locked loop (PLL)

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Publication history

Received: 30 September 2019
Revised: 04 January 2020
Accepted: 17 January 2020
Published: 13 February 2020
Issue date: January 2022

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© 2019 CSEE

Acknowledgements

Acknowledgements

This work is supported in part by the National Natural Science Foundation of China (No. 51807089, 51877104) and in part by the Natural Science Foundation of Jiangsu Province (No. BK20180432).

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