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<p>Traditional wireless current sharing control strategies primarily focus on identical inverters, considering the impact of line impedance while neglecting the differences in inverter characteristics. These strategies are insufficient for achieving satisfactory current sharing performance when applied to paralleled non-identical single-phase inverters. The characteristic analysis presented in this paper reveals that matching no-load voltage gains and equivalent output impedances is essential for the parallel control of non-identical inverters. An enhanced current sharing strategy that combines a Hopf oscillator and synchronous reference frame proportional-integral (SRFPI) control is proposed. The Hopf oscillator provides self-synchronization capability capabilities for the inverters, while SRFPI mitigates the characteristic differences among inverters at the fundamental frequency. Comprehensive theoretical analyses, including control structure and principles, system stability, and key parameter design, are provided. Finally, semi-physical simulation experiments involving three non-identical inverters demonstrate that the proposed control method enhances output voltage quality, improves current sharing accuracy, and yields a better dynamic response.</p>

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Current Sharing Strategy for Paralleled Non-Identical Single-Phase Inverters Based on Hopf Oscillator and SRFPI Control

  • 期刊论文

  • 发表日期：

    2025年9月24日

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  • Liaoyuan Lin,
  • Qixuan Liu,
  • Xiong Guo,
  • Quan Ke

摘要

Traditional wireless current sharing control strategies primarily focus on identical inverters, considering the impact of line impedance while neglecting the differences in inverter characteristics. These strategies are insufficient for achieving satisfactory current sharing performance when applied to paralleled non-identical single-phase inverters. The characteristic analysis presented in this paper reveals that matching no-load voltage gains and equivalent output impedances is essential for the parallel control of non-identical inverters. An enhanced current sharing strategy that combines a Hopf oscillator and synchronous reference frame proportional-integral (SRFPI) control is proposed. The Hopf oscillator provides self-synchronization capability capabilities for the inverters, while SRFPI mitigates the characteristic differences among inverters at the fundamental frequency. Comprehensive theoretical analyses, including control structure and principles, system stability, and key parameter design, are provided. Finally, semi-physical simulation experiments involving three non-identical inverters demonstrate that the proposed control method enhances output voltage quality, improves current sharing accuracy, and yields a better dynamic response.