Design of a soft-switched three-port converter with DSP control for power flow management in hybrid fuel cell systems

Tao, Haimin; Kotsopoulos, A.; Duarte, J.L.; Hendrix, M.A.M.

doi:10.1109/epe.2005.219309

Cited by 15 publications

(14 citation statements)

References 6 publications

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“…In [17] and [20], the converter shown in Fig. 6 (topology 2) and its derivatives were verified on an experimental prototype at a power level of maximum 2 kW at 20 kHz switching frequency.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Family of multiport bidirectional DC–DC converters

Tao¹,

Kotsopoulos²,

Duarte³

et al. 2006

IEE Proc., Electr. Power Appl.

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419

189

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Multiport DC-DC converters are of potential interest in applications such as generation systems utilising multiple sustainable energy sources. A family of multiport bidirectional DC-DC converters derived from a general topology is presented. The topology shows a combination of DC-link and magnetic coupling. This structure makes use of both methods to interconnect multiple sources without the penalty of extra conversion or additional switches. The resulting converters have the advantage of being simple in topology and have a minimum number of power devices. The proposed general topology and basic cells show several possibilities to construct a multiport converter for particular applications and provide a solution to integrate diverse sources owing to their flexibility in structure. The system features a minimal number of conversion steps, low cost and compact packaging. In addition, the control and power management of the converter by a single digital processor is possible. The centralised control eliminates complicated communication structures that would be necessary in the conventional structure based on separate conversion stages. A control strategy based on classical control theory is proposed, showing a multiple PIDloop structure. The general topology and a set of three-port embodiments are detailed.

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“…In [17] and [20], the converter shown in Fig. 6 (topology 2) and its derivatives were verified on an experimental prototype at a power level of maximum 2 kW at 20 kHz switching frequency.…”

Section: Resultsmentioning

confidence: 99%

“…However, the phase shift compensations are coupled and mutually influence each other. A decoupling network or bandwidth limitation should be applied to avoid undesirable oscillation in the system, as partly addressed in [20], where a three-port converter is analysed. Fig.…”

Section: Control Schemementioning

confidence: 99%

Family of multiport bidirectional DC–DC converters

Tao¹,

Kotsopoulos²,

Duarte³

et al. 2006

IEE Proc., Electr. Power Appl.

Self Cite

419

189

View full text Add to dashboard Cite

show abstract

“…Not surprisingly, the two PI control loops are coupled and influence each other [15]. The bandwidth of the voltage control loop (ϕ 12 ) is tuned higher (5 to 10 times higher) than that of the power control loop (ϕ 13 ) so that the interaction is reduced while a fast response to the load variations is guaranteed.…”

Section: Control Strategymentioning

confidence: 99%

High-Power Three-Port Three-Phase Bidirectional DC-DC Converter

Tao

Duarte

Hendrix

2007

2007 IEEE Industry Applications Annual Meeting

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Abstract-This paper proposes a three-port three-phase bidirectional dc-dc converter suitable for high-power applications. The converter combines a slow primary source and a fast storage to power a common load (e.g., an inverter). Since this type of system is gaining popularity in sustainable energy generation systems and electrical vehicles, the proposed topology is of practical interest. The proposed converter consists of three high-frequency inverter stages operating in a six-step mode, and a high-frequency three-port three-phase symmetrical transformer. The converter provides galvanic isolation and supports bidirectional power flow for all the three ports. An arbitrary power flow profile in the system can be achieved by phase shifting the three inverter stages. Thanks to the three-phase structure, the current handling capability of the circuit is larger and the ripple currents at the dc sides are much lower owing to the interleaving effect of the threephase, and thus the VA rating of the filter capacitors is much lower. The operating principle and, in particular, the transformer design which is based on conventionally and coaxially wound structures are presented. Circuit simulation results are included to verify the proposed converter topology and the dual-PI-loop control strategy.

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“…Each ePWM module can be directly operated in phase shift modulation mode by hardware. There is no need to implement the digital phase shift with a software interrupt routine as presented in [9]. This saves time for the CPU to execute time critical tasks.…”

Section: Control Of the Dc-dc And Dc-ac Stagesmentioning

confidence: 99%

High-resolution phase shift and digital implementation of a fuel cell powered UPS system

Tao

Duarte

Hendrix

2007

2007 European Conference on Power Electronics and Applications

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Please check the document version of this publication:• A submitted manuscript is the version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publicationGeneral rights Copyright 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 recognise 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.If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the "Taverne" license above, please follow below link for the End User Agreement: www.tue.nl/taverne Take down policyIf you believe that this document breaches copyright please contact us at: openaccess@tue.nl providing details and we will investigate your claim. AbstractThis paper presents the digital implementation of a single-phase fuel cell powered uninterruptible power supply (UPS) and distributed generation (DG) system. The power conditioning unit of the system consists of a voltage source inverter and a three-port bidirectional dc-dc converter interfacing the fuel cell and inverter with a supercapacitor. It is shown that the control of the whole system including both the dc-dc and dc-ac stages can be carried out by a single digital signal processor (DSP). In particular, in order to eliminate limit cycle oscillations in digitally controlled dc-dc converters, the generation of highresolution phase shifts is explained in detail. The system is suitable for residential applications and can improve the power quality for the local user. Practical design issues such as the state-of-charge (SOC) management of the supercapacitor and prototype design details are discussed. Experimental results from a 3.5 kW prototype are presented to verify the effectiveness of the digitally implemented control scheme.

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Design of a soft-switched three-port converter with DSP control for power flow management in hybrid fuel cell systems

Cited by 15 publications

References 6 publications

Family of multiport bidirectional DC–DC converters

Family of multiport bidirectional DC–DC converters

High-Power Three-Port Three-Phase Bidirectional DC-DC Converter

High-resolution phase shift and digital implementation of a fuel cell powered UPS system

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