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Energies 2017, 10(3), 261; doi:10.3390/en10030261

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

State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China
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Academic Editor: Sheldon S. Williamson
Received: 29 November 2016 / Revised: 12 February 2017 / Accepted: 20 February 2017 / Published: 23 February 2017
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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%). View Full-Text
Keywords: inductive power transfer (IPT); parallel-connected inverter; circulating currents; current phasor and voltage constant control inductive power transfer (IPT); parallel-connected inverter; circulating currents; current phasor and voltage constant control
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MDPI and ACS Style

Mai, R.; Lu, L.; Li, Y.; Lin, T.; He, Z. Circulating Current Reduction Strategy for Parallel-Connected Inverters Based IPT Systems. Energies 2017, 10, 261.

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