A Power Regulation and Harmonic Current Elimination Approach for Parallel Multi-Inverter Supplying IPT Systems

Li, Yong; Liwen, Lu; He, Zhengyou

doi:10.6113/jpe.2016.16.4.1245

Cited by 5 publications

(9 citation statements)

References 33 publications

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“…Moreover, it may increase the risk of frequency bifurcation due to the existence of more soft switching running points. The second group of methods utilize multi-phase converter and matrix converter to increase high-power conversion ability [14,15], which can reduce the stress of switches at the same time. However, it has a complex circuit structure and the resonant tank still needs to be subjected to excessive current and voltage stress in high-power application.…”

Section: Introductionmentioning

confidence: 99%

A Phase-Shifted Control for Wireless Power Transfer System by Using Dual Excitation Units

Dai

Jiang

et al. 2017

Energies

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Wireless power transfer (WPT) technology can provide intelligent robots with a flexible, robust, and safe power supply, especially in very harsh environments including high humidity and high temperature. To meet increasing power requirement for robotic applications, this paper proposes a novel method to increase system power transfer capability without increasing voltage and current stress, realized by using dual excitation units at the primary side. On this basis, this paper proposes a phase-shifted control method for output power regulation which can keep efficiency high. At the same time, the system is proved to have a better output robust characteristic by analysis under the condition of parameter variation. Finally, experimental results show the proposed dual excitation units (DEU)-WPT system can increase output power by at least three times compared to classical WPT system, and the efficiency is improved by 9%. Figure 1. Dual excitation unit wireless power transfer (DEU-WPT) system.The equivalent circuit of the circuit model is shown in Figure 2, where L p1 , L p2 are primary coil and L s are secondary coil inductance, respectively. C p1 , C p2 , and C s are the resonant capacitance. i p1 , i p2 are resonant currents in the coil. u p1 and u p2 are resonant voltage at the primary side. Z 1 and Z 2 are the reflection impedance. C o is the capacitance of rectifier circuit, and R L is the equivalent load resistance.

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Section: Introductionmentioning

confidence: 99%

A Phase-Shifted Control for Wireless Power Transfer System by Using Dual Excitation Units

Dai

Jiang

et al. 2017

Energies

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“…Firstly, the parallel three-inverter IPT system without the series-parallel resonant tank has been discussed in [21] and the equivalent circuit is shown in Figure 2. …”

Section: Principle Description Of the Parallel-connected Inverter Topmentioning

confidence: 99%

“…Firstly, the parallel three-inverter IPT system without the series-parallel resonant tank has been discussed in [21] and the equivalent circuit is shown in Figure 2. By employing the phase-shift control technology in the parallel-connected inverter IPT system [10], the output voltage waveforms are shown in Figure 3.…”

Section: Principle Description Of the Parallel-connected Inverter Topmentioning

confidence: 99%

“…However, it is difficult to choose the additional capacitors to let the inverter work under resonant condition and achieve power sharing due to the inevitable component tolerances. For the parallel connected method, a straightforward method of improving the power levels is that employing the parallel-connected inverter topology for feeding IPT systems [10,21]. A power regulation and selective harmonic current elimination approach of parallel-connected inverter is proposed in [21] for supplying IPT systems, which not only can upgrade the capacity of the power supply, but also can suppress the total harmonic distortion (THD) of the primary coil current.…”

Section: Introductionmentioning

confidence: 99%

“…The harmonic circulating current [23] should be considered in the parallel-connected inverter IPT system, due to the high THD of the inverter output voltage [10] and the tolerance of circuit parameters when the inverter adopts the phase shift control technology. Besides, the fundamental circulating current exists between the parallel inverter units [21] due to the unbalance of parallel connected inverters, such as the gate pulse delay, the pulse width modulator randomness and the control delay. As a result, the electric and thermal stresses are unbalanced between the parallel inverters [24,25], and it will increase the potential damage to the IPT system.…”

Section: Introductionmentioning

confidence: 99%

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

Liwen

Lin

et al. 2017

Energies

Self Cite

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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%).

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Review on single‐phase high‐frequency resonant inverters for current sharing in multiple inverter system

Pengyu,

Junfeng,

Mingze

et al. 2023

Circuit Theory & Apps

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SummarySingle‐phase high‐frequency resonant inverters (SPHFRIs) with high power density, fast dynamic response, and high energy conversion efficiency have been widely studied and used in academia and industry. With the development of the modularization concept, the operation of multiple inverter modules is desirable because it can remove the limitations of cost, heat dissipation, and component volume in single inverter operation. However, a critical challenge in multiple inverter systems is that the both the phase and magnitude of the output voltage of each inverter module must be controllable to eliminate circulating currents between inverter modules. Great efforts have been made to solve this problem from three aspects: topology, modulation, and control strategy. In this paper, modulation strategies and topologies of different inverters are presented and reviewed to provide guidance to researchers working in this field. Firstly, multiple inverter system based on the SPHFRI is described and its advantages and disadvantages are analyzed. An important issue in the study of multiple inverter systems is presented, that is, the suppression of circulating current. Secondly, the circulating currents in a multiple inverter system are analyzed and derived from two aspects: (1) magnitude and phase angle and (2) active and reactive currents. Thirdly, the inverters used in the multiple inverter system are introduced, and their operating principles, advantages, and disadvantages are reviewed. A key comparison of several inverters is presented for the benefit of the readers. Fourth, through PI closed‐loop simulation, the performance of different multiple inverter systems for suppressing the circulating current is compared in two situations: (1) with magnitude discrepancy only and (2) with both magnitude and phase discrepancy. Finally, the advantages and disadvantages of each inverter are summarized, and the state of the art and future trends are presented.

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A Power Regulation and Harmonic Current Elimination Approach for Parallel Multi-Inverter Supplying IPT Systems

Cited by 5 publications

References 33 publications

A Phase-Shifted Control for Wireless Power Transfer System by Using Dual Excitation Units

A Phase-Shifted Control for Wireless Power Transfer System by Using Dual Excitation Units

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

Review on single‐phase high‐frequency resonant inverters for current sharing in multiple inverter system

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