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Voltage Balancing Control of Diode-Clamped Multilevel Converters With Passive Front-Ends.
- Source :
-
IEEE Transactions on Power Electronics . Jul2008, Vol. 23 Issue 4, p1751-1758. 8p. 2 Diagrams, 11 Graphs. - Publication Year :
- 2008
-
Abstract
- In the previous literature, it has been reported that it is not possible to guarantee the balance of the dc-link capacitor voltages of multilevel three-phase diode-clamped dc-ac converters with passive front-ends for high modulation indices, especially for more than three levels. This paper proposes a novel closed-loop control approach capable of guaranteeing such balance for all ope]rating conditions of the converters without the need for additional hardware. Three different phase duty-ratio perturbation schemes are proposed. They are compared through simulation for the case of a four-level three-phase diode-clamped dc-ac converter operated with a virtual-vector-based modulation. The most simple and effective perturbation scheme, only requiring the sensing of all dc-link capacitor voltages, is tested experimentally in the same four-level converter. The results demonstrate the feasibility of guaranteeing the dc-link capacitor voltage balance for all converter operating conditions. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ELECTRIC current converters
*DIODES
*CAPACITORS
*ELECTRONICS
*POWER electronics
Subjects
Details
- Language :
- English
- ISSN :
- 08858993
- Volume :
- 23
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Power Electronics
- Publication Type :
- Academic Journal
- Accession number :
- 34752563
- Full Text :
- https://doi.org/10.1109/TPEL.2008.925182