Comparison of APF‑PLL and SOGI‑PLL operational stability in parallel single‑phase inverters under weak grid conditions

This study analyzes the operational instability caused by the influence of phase-locked loops (PLLs) in a 3.3 KW single-phase solar inverter connected in parallel in regions with a high-impedance grid. This study analyzes the performance differences between two PLL methods: APF-PLL and SOGI-PLL. Experimental results show that the SOGI-PLL method demonstrates high stability under various environmental conditions, confirming its potential to enhance the reliability of photovoltaic inverter systems.

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Cite this article

[IEEE Style]

S. Joo, J. Yu, H. Kim, U. Choi, Y. Choi, J. Yang, U. Park, "Comparison of APF‑PLL and SOGI‑PLL operational stability in parallel single‑phase inverters under weak grid conditions," Journal of Power Electronics, vol. 25, no. 2, pp. 301-311, 2025. DOI: 10.1007/s43236-024-00978-z.

[ACM Style]

Sang-Hyun Joo, Jeong-Seon Yu, Hag-Wone Kim, Unseong Choi, Yeonggyu Choi, Jinhee Yang, and Unho Park. 2025. Comparison of APF‑PLL and SOGI‑PLL operational stability in parallel single‑phase inverters under weak grid conditions. Journal of Power Electronics, 25, 2, (2025), 301-311. DOI: 10.1007/s43236-024-00978-z.