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The critical issue of double-frequency power ripple in integrated photovoltaic systems (IPS) has restricted their working stability, which causes severe LED flicker and reduces capacitor lifespan. Through mechanism analysis, this paper identifies that the ripple originates from AC-DC power imbalance during grid interaction, manifesting as current ripple in the DC bus under stable voltage conditions. To suppress this ripple, a bi-directional buck converter is selected as the buffer circuit to transfer ripple energy to a film capacitor. Compared to the traditional method using electrolytic capacitors, the new one significantly reduces volume and extends system longevity. Furthermore, an optimized parallel dual-PI control structure is developed to replace the conventional series control structure. This optimization effectively eliminates controller coupling and enhances control capability. Simulations demonstrate a nearly 50% improvement in ripple suppression effect and a 2% efficiency gain over boost-type solutions.

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The Mechanism Analysis and Optimized Suppression Method of Double-Frequency Power Ripple in Integrated Photovoltaic Systems

  • 会议论文

  • 发表日期：

    2026年

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  • Zimeng Shi,
  • Junfeng Liu,
  • Zhixing Yan,
  • Qing Zhang,
  • Jun Zeng

摘要

The critical issue of double-frequency power ripple in integrated photovoltaic systems (IPS) has restricted their working stability, which causes severe LED flicker and reduces capacitor lifespan. Through mechanism analysis, this paper identifies that the ripple originates from AC-DC power imbalance during grid interaction, manifesting as current ripple in the DC bus under stable voltage conditions. To suppress this ripple, a bi-directional buck converter is selected as the buffer circuit to transfer ripple energy to a film capacitor. Compared to the traditional method using electrolytic capacitors, the new one significantly reduces volume and extends system longevity. Furthermore, an optimized parallel dual-PI control structure is developed to replace the conventional series control structure. This optimization effectively eliminates controller coupling and enhances control capability. Simulations demonstrate a nearly 50% improvement in ripple suppression effect and a 2% efficiency gain over boost-type solutions.