Parallel Three-Phase Inverters: Optimal PWM Method for Flux Reduction in Intercell Transformers

Cougo, Bernardo; Meynard, Thierry; Gateau, Guillaume

doi:10.1109/tpel.2011.2105509

Cited by 111 publications

(28 citation statements)

References 23 publications

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“…The single phase inductors are used which will also introduce inductance in the circulating current path. This arrangement is adopted to simplify the measurement [9]. From Fig.…”

Section: Simulation and Experimental Resultsmentioning

confidence: 99%

“…For parallel interleaved VSCs, the PWM scheme has a strong influence on the maximum peak flux density and the losses in the CI. The variation in the maximum value of the peak flux-linkage with the modulation index for different PWM schemes [9] is plotted in Fig. 7.…”

Section: Influence On the Coupled Inductor Designmentioning

confidence: 99%

“…Both of these parameters are strongly influenced by the PWM method used. The peak flux density in the core of CI for different PWM scheme is discussed in [9] and modulation method to reduce the flux in CI is also proposed. However, discussion on the core losses is not given, which is an important factor in determining the size of the thermally limited magnetic component, and it should be considered carefully for proper design of the CI.…”

Section: Introductionmentioning

confidence: 99%

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Parallel interleaved VSCs: Influence of the PWM scheme on the design of the coupled inductor

Gohil

Bede

Maheshwari

et al. 2014

IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society

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Abstract-The line current ripple and the size of the dc-link capacitor can be reduced by interleaving the carriers of the parallel Voltage Source Converters (VSCs). However, the interleaving of carriers introduces circulating current between VSCs, and it should be suppressed. To limit the circulating current, magnetic coupling between the interleaved legs is provided by means of the Coupled Inductor (CI). The design of CI is strongly influenced by the pulsewidth modulation (PWM) scheme used. The analytical model to evaluate the flux-linkage in CI is presented in this paper. The maximum flux density and the core losses being the most important parameters for CI design, they are evaluated for continuous PWM and discontinuous pulsewidth modulation (DPWM) schemes. The effect of each of these PWM schemes on the design of the CI is discussed in the detail. The simulation and experimental results are finally presented to validate the analysis.

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“…The single phase inductors are used which will also introduce inductance in the circulating current path. This arrangement is adopted to simplify the measurement [9]. From Fig.…”

Section: Simulation and Experimental Resultsmentioning

confidence: 99%

Section: Influence On the Coupled Inductor Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Parallel interleaved VSCs: Influence of the PWM scheme on the design of the coupled inductor

Gohil

Bede

Maheshwari

et al. 2014

IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society

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“…Typically, this impedance can be introduced by inserting CM inductor in series with the line filter inductors [27] or using CI for each phase group [23]- [25], [30]. Assuming a strong coupling between the windings, the effect of the leakage flux is neglected in the analysis.…”

Section: A Effect Of the Switching Sequences On The Circulating Currmentioning

confidence: 99%

“…A modified CI, which is proposed in [30], combines the functionality of both the line filter inductor and the circulating current filter. To reduce the flux linkage in the CI, a PWM scheme is proposed in [25]. This PWM scheme adds an optimal common-mode offset to the reference signals based on the modulation index.…”

Section: Introductionmentioning

confidence: 99%

Modified Discontinuous PWM for Size Reduction of the Circulating Current Filter in Parallel Interleaved Converters

Gohil

Maheshwari

Bede

et al. 2015

IEEE Trans. Power Electron.

106

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Suggested citation format:Gohil, G.; Maheshwari, R.; Bede, L.; Kerekes, T.; Teodorescu, R.; Liserre, M.; Blaabjerg, F., "Modified Discontinuous PWM for Size Reduction of the Circulating Current Filter in Parallel Interleaved Converters," IEEE Transactions on Power Electronics , vol.30, no.7, pp.3457,3470, July 2015. General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognize and abide by the legal requirements associated with these rights. Users may download and print one copy of any publication from the public portal for the purpose of private study or research.  You may not further distribute the material or use it for any profit-making activity or commercial gain.  You may freely distribute the URL identifying the publication in the public portal. Take down policyIf you believe that this document breaches copyright please contact us at vbn@aub.aau.dk providing details, and we will remove access to the work immediately and investigate your claim. Abstract-Parallel Voltage Source Converters (VSCs) require an inductive filter to suppress the circulating current. The size of this filter can be minimized by reducing either the maximum value of the flux linkage or the core losses. This paper presents a modified Discontinuous Pulsewidth Modulation (DPWM) scheme to reduce the maximum value of the flux linkage and the core losses in the circulating current filter. In the proposed PWM scheme, the dwell time of an active vector is divided within a half-carrier cycle to ensure simultaneous occurrence of the same zero vectors in both VSCs. A function to decide the ratio of the dwell time of the divided active vector is also presented. The effect of the proposed PWM scheme on the maximum value of the flux linkage and the core losses is analyzed and compared with that of the space vector modulation and 60• clamped DPWM schemes. The analytical expressions for the maximum value of the flux linkage are derived for each of these PWM schemes. In addition, the effect of the proposed PWM scheme on the line current ripple and the switching losses is also analyzed and compared. To verify the analysis, experimental results are presented, which prove the effectiveness of the proposed PWM scheme.

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Current balancer-based grid-connected parallel inverters for high power wind-power system

Peng

2013

Int. Trans. Electr. Energ. Syst.

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SUMMARY Current balancer‐based phase leg paralleling provides a preponderant technology for the grid‐tie inverter to extend current rating when transporting high wind power to the grid. However, the existing technology used one current balancer per phase output (one core per phase), so that three current balancers (three separate cores) were required for the three‐phase system, which caused redundant large size. Also, the low‐frequency circulating current components have to be controlled in order to avoid saturation of the current balancer designed for minimizing the switching frequency components of circulating current. This paper contributes in three aspects: (i) two multiphase coupling current balancers are proposed for two parallel configurations, only one single core is employed for the three‐phase system, and the compactness and light weight are achieved with a very high permeability magnetic core and no air gap. (ii) The detailed current balancer design methods are proposed for both configurations, and the designed two prototypes compare two current balancers for application to two inverter configurations. (iii) A current closed‐loop control is proposed to minimize the circulating current, which is verified by the simulated results. Copyright © 2013 John Wiley & Sons, Ltd.

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Parallel Three-Phase Inverters: Optimal PWM Method for Flux Reduction in Intercell Transformers

Cited by 111 publications

References 23 publications

Parallel interleaved VSCs: Influence of the PWM scheme on the design of the coupled inductor

Parallel interleaved VSCs: Influence of the PWM scheme on the design of the coupled inductor

Modified Discontinuous PWM for Size Reduction of the Circulating Current Filter in Parallel Interleaved Converters

Current balancer-based grid-connected parallel inverters for high power wind-power system

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