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<p>Magnetic core-based inductive energy harvesting offers an effective means of powering online monitoring equipment in high-voltage cables and transmission lines. However, challenges such as insufficient power output at low currents, core saturation at high currents, and instability under current fluctuations persist. To address these limitations, this study proposes a stable energy-harvesting method using a dual-core structure combined with virtual impedance adjustment. First, an equivalent circuit model is developed to analyze the mechanisms underlying power deficiency at low currents and core saturation at high currents. Further, a virtual impedance-control strategy is introduced to regulate the capacitive and inductive characteristics of the system, thereby enhancing excitation to improve output at low currents and enabling demagnetization to mitigate saturation at high currents. Simulation and experimental results show that the proposed method achieves high-power, stable energy harvesting over a wide current range (10–1000&#xa0;A), thereby meeting the power demands of online monitoring systems in high-voltage transmission infrastructure.</p>

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Stable Energy-Harvesting Method Using Dual Cores and Virtual Impedance Adjustment

  • 期刊论文

  • 发表日期：

    2026年7月31日

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  • Zhou Yue,
  • Shaosheng Fan,
  • Bo Yan,
  • Bo Liu

摘要

Magnetic core-based inductive energy harvesting offers an effective means of powering online monitoring equipment in high-voltage cables and transmission lines. However, challenges such as insufficient power output at low currents, core saturation at high currents, and instability under current fluctuations persist. To address these limitations, this study proposes a stable energy-harvesting method using a dual-core structure combined with virtual impedance adjustment. First, an equivalent circuit model is developed to analyze the mechanisms underlying power deficiency at low currents and core saturation at high currents. Further, a virtual impedance-control strategy is introduced to regulate the capacitive and inductive characteristics of the system, thereby enhancing excitation to improve output at low currents and enabling demagnetization to mitigate saturation at high currents. Simulation and experimental results show that the proposed method achieves high-power, stable energy harvesting over a wide current range (10–1000 A), thereby meeting the power demands of online monitoring systems in high-voltage transmission infrastructure.