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Modeling and control of a tapped-inductor buck converter with pulse frequency modulation
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.ORCID iD: 0000-0001-8891-5659
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.ORCID iD: 0000-0003-3455-9067
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.ORCID iD: 0000-0002-8565-4753
2014 (English)In: Energy Conversion Congress and Exposition (ECCE), 2014 IEEE, IEEE Computer Society, 2014, 3672-3678 p.Conference paper, Published paper (Refereed)
Abstract [en]

The tapped-inductor buck (TI-buck) converter has shown to be a suitable solution for auxiliary power supply for modular multilevel converter submodules. Such application features a large step-down voltage conversion, made at relatively low output power. This converter operates in discontinuous conduction mode with zero voltage switching of the high-voltage valve. This paper treats the dynamic behaviour of the aforementioned converter. First, an average output current model of the converter is developed and a small signal model is obtained. Then, a closed-loop output voltage control, which uses the switching frequency as control variable, is designed and implemented using a microcontroller. Measurements on a down-scaled prototype shows that the control system provides a well-controlled average output voltage, which is stable under significant load variation. Finally, a solution for implementing the start-up of the converter is presented and tested.

Place, publisher, year, edition, pages
IEEE Computer Society, 2014. 3672-3678 p.
Keyword [en]
power convertors, power inductors, pulse frequency modulation, auxiliary power supply, closed-loop output voltage control, modular multilevel converter submodules, pulse frequency modulation, tapped-inductor buck converter, Gain, Load modeling, Logic gates, Mathematical model, Prototypes;Switches, Voltage control
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
SRA - Energy
Identifiers
URN: urn:nbn:se:kth:diva-165409OAI: oai:DiVA.org:kth-165409DiVA: diva2:808261
Conference
Energy Conversion Congress and Exposition (ECCE), 2014 IEEE
Funder
StandUp
Note

QC 20150521

Available from: 2015-04-27 Created: 2015-04-27 Last updated: 2015-05-21Bibliographically approved
In thesis
1. Cascaded Converters with Gate-Commutated Thyristors: Experimental Verification and Auxiliary Power Supply
Open this publication in new window or tab >>Cascaded Converters with Gate-Commutated Thyristors: Experimental Verification and Auxiliary Power Supply
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis describes an effort to investigate the use of gate-commutated thyristors(GCTs) in cascaded converters. Cascaded converters, such as modularmultilevel converters (M2Cs) and cascaded H-bridge converters (CHBs), haveproved to be especially suitable in high-voltage, high-power applications. Allof the most important advantages of cascaded converters, e.g. redundancy andscalability, can be attributed to the modular structure. Of special interestregarding the choice of semiconductor power devices is the reduced requirementon the switching frequency of individual devices. This brings a shift in thetrade-off between switching and conduction losses, where the latter has moreimportance in cascaded converters than in other topologies. This shift favorsthyristor-type devices like the GCT, which can achieve very low conductionlosses.To quantify the potential gain in the application of GCTs in cascadedconverters the losses have been calculated and a comparison between differentsubmodule implementations has been presented. The comparison has shownthat GCTs can provide 20-30% lower losses compared to insulated-gate bipolartransistors (IGBTs) in a typical HVDC application. In order to verify the lowlosses of GCT-based submodules, extensive work has been put into buildingand testing full-scale submodules employing GCTs. A resonant test circuithas been developed in which the submodules can be tested in steady-stateoperation which allows calorimetric measurements of the losses. The calorimetricmeasurements have verified that the loss calculation was reasonableand not lacking any important components.A drawback of GCTs is that the gate-drive units require much more powerthan gate-drive units for comparable IGBTs. In order to employ GCTs inhigh-voltage cascaded converters some means of supplying this power in thesubmodule must be provided. One option is to take this power from thesubmodule dc-link, but this requires a dc-dc converter capable of high inputvoltages. A tapped-inductor buck converter with a novel, autonomous highsidevalve was developed for this application. The autonomous operation of thehigh-side valve allows reliable operation without galvanic isolation components.A converter with a high-side valve with series-connected MOSFETs capable ofan input voltage of 3 kV has been presented.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. 47 p.
Series
TRITA-EE, ISSN 1653-5146 ; 2015:021
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-166666 (URN)978-91-7595-581-0 (ISBN)
Public defence
2015-06-08, Kollegiesalen, Brinellvägen 8, KTH, Stockholm, 10:15 (English)
Opponent
Supervisors
Note

QC 20150521

Available from: 2015-05-21 Created: 2015-05-13 Last updated: 2015-05-21Bibliographically approved

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Modeer, TomasNorrga, Staffan

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