Modeling and control of a tapped-inductor buck converter with pulse frequency modulation
2014 (English)In: Energy Conversion Congress and Exposition (ECCE), 2014 IEEE, IEEE Computer Society, 2014, 3672-3678 p.Conference paper (Refereed)
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.
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
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject SRA - Energy
IdentifiersURN: urn:nbn:se:kth:diva-165409OAI: oai:DiVA.org:kth-165409DiVA: diva2:808261
Energy Conversion Congress and Exposition (ECCE), 2014 IEEE
QC 201505212015-04-272015-04-272015-05-21Bibliographically approved