Three-Level DC Converter for Balancing DC 800-V Voltage

This paper studies a three-level dc converter for balancing the dc input voltage, which has a similar topology with the conventional three-level dc converter. It can easily build a neutral line for changing a dc voltage source into two dc voltage-level sources. A control strategy of conducting time...

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Bibliographic Details
Published inIEEE transactions on power electronics Vol. 30; no. 7; pp. 3499 - 3507
Main Authors Zhang, Xianjin, Gong, Chunying, Yao, Zhilei
Format Journal Article
LanguageEnglish
Published New York IEEE 01.07.2015
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Conductivity
Educational institutions
Electric currents
Electronics
Inductors
Prototypes
Stress
Switches
Topology
Transformers
Voltage control
renewable resources
neutral line
neutral-point clamped
DC microgrid
three-level converter
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Summary:This paper studies a three-level dc converter for balancing the dc input voltage, which has a similar topology with the conventional three-level dc converter. It can easily build a neutral line for changing a dc voltage source into two dc voltage-level sources. A control strategy of conducting time extension of partial switch devices is also presented for achieving three-level states of each power switch. The operating principle of the converter is analyzed in detail based on the presented control strategy. The small-signal model and the effects of the proposed control strategy are also driven. Finally, a prototype is fabricated and tested in the lab and the experimental results verify the converter to achieve three-level characteristics and to have a good ability of balancing the input voltage.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2014.2344016