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<p>This study analyzes the operational instability caused by the influence of phase-locked loops (PLLs) in a 3.3&#xa0;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.</p>

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

  • 期刊论文

  • 发表日期：

    2025年1月6日

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  • Sang-Hyun Joo,
  • Jeong-Seon Yu,
  • Hag-Wone Kim,
  • Unseong Choi,
  • Yeonggyu Choi,
  • Jinhee Yang,
  • Unho Park

摘要

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.