Design of a High-Power Resonant Converter for DC Wind Turbines

This paper presents a design procedure and loss estimation for a high-power, medium-voltage series resonant converter (entitled SRC#), intended for application in megawatt medium-voltage dc wind turbines. The converter is operated with a novel method of operation, entitled pulse removal technique, c...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2019-07, Vol.34 (7), p.6136-6154
Main Authors: Dincan, Catalin Gabriel, Kjaer, Philip, Chen, Yu-Hsing, Sarra-Macia, Eduard, Munk-Nielsen, Stig, Bak, Claus Leth, Vaisambhayana, Sriram
Format: Article
Language:English
Subjects:
Circuit design
Converters
Electric potential
Frequency control
Inverters
Medium-frequency transformer
medium-voltage direct current (MVdc)
offshore wind farm
Power transformer insulation
Resonant converters
Resonant frequency
series resonant circuit (SRC)
sub-resonant mode
Topology
Wind turbines
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Summary:This paper presents a design procedure and loss estimation for a high-power, medium-voltage series resonant converter (entitled SRC#), intended for application in megawatt medium-voltage dc wind turbines. The converter is operated with a novel method of operation, entitled pulse removal technique, characterized by variable frequency and phase-shift modulation, below the resonant point of the LC tank. A step-by-step design procedure is proposed and circuit component ratings and efficiency are compared for two variants. The new method of operation reduces transformer size to below 50%, whereas losses are kept below 1.5% from zero to nominal power, due to soft-switching characteristics. An experimental setup, rated for 10 kW and 5 kV output was assembled to extract losses and validate the semiconductor loss model.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2018.2876320