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Circulating Current Reduction Strategy for Parallel-Connected Inverters Based IPT Systems

Author

Listed:
  • Ruikun Mai

    (State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China)

  • Liwen Lu

    (State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China)

  • Yong Li

    (State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China)

  • Tianren Lin

    (State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China)

  • Zhengyou He

    (State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China)

Abstract

Multiple inverters connected in parallel is a promising method to upgrade the power capacity of inductive power transfer (IPT) systems. Due to a slight unbalance of the control signals, the inner resistances of the inverters and other uncertainties, circulating currents exist among the parallel units which reduce the reliability of IPT systems. Firstly, the series-parallel resonant tank is employed in the multiple inverters based IPT system to eliminate the DC and harmonic circulating currents. The fundamental circulating currents in the paralleled inverter units are analyzed in detail. Then, for eliminating the fundamental circulating currents, a current decomposition method and a control diagram are proposed to avoid acquiring the phase of the current by detecting zero cross current point which increases the accuracy of the control algorithm. Finally, a 1-kW parallel-connected inverter IPT system is provided to verify the proposed approach. The experimental results show that the proposed method is effective for eliminating the fundamental circulating currents. The maximum efficiency of the system is up to 92.18% which is 0.53% higher compared to that without the current phasor control (91.65%).

Suggested Citation

  • Ruikun Mai & Liwen Lu & Yong Li & Tianren Lin & Zhengyou He, 2017. "Circulating Current Reduction Strategy for Parallel-Connected Inverters Based IPT Systems," Energies, MDPI, vol. 10(3), pages 1-17, February.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:3:p:261-:d:91255
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    References listed on IDEAS

    as
    1. Feng Wen & Xueliang Huang, 2016. "Optimal Magnetic Field Shielding Method by Metallic Sheets in Wireless Power Transfer System," Energies, MDPI, vol. 9(9), pages 1-15, September.
    2. Kunwar Aditya & Sheldon Williamson, 2016. "Linearization and Control of Series-Series Compensated Inductive Power Transfer System Based on Extended Describing Function Concept," Energies, MDPI, vol. 9(11), pages 1-16, November.
    3. Yong Li & Ruikun Mai & Tianren Lin & Hongjian Sun & Zhengyou He, 2017. "A Novel WPT System Based on Dual Transmitters and Dual Receivers for High Power Applications: Analysis, Design and Implementation," Energies, MDPI, vol. 10(2), pages 1-16, February.
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    Cited by:

    1. Jacek Maciej Stankiewicz, 2023. "Evaluation of the Influence of the Load Resistance on Power and Efficiency in the Square and Circular Periodic WPT Systems," Energies, MDPI, vol. 16(7), pages 1-19, March.
    2. Monica Purushotham & Kowsalya Muniswamy, 2019. "Reinforced Droop for Active Current Sharing in Parallel NPC Inverter for Islanded AC Microgrid Application," Energies, MDPI, vol. 12(16), pages 1-27, August.
    3. Jacek Maciej Stankiewicz, 2023. "Analysis of the Influence of the Skin Effect on the Efficiency and Power of the Receiver in the Periodic WPT System," Energies, MDPI, vol. 16(4), pages 1-22, February.

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