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Multilevel inverter with 12-sided polygonal voltage space vector locations for induction motor drive.
- Source :
-
IEE Proceedings -- Electric Power Applications . May2006, Vol. 153 Issue 3, p411-419. 9p. 1 Diagram, 2 Charts, 6 Graphs. - Publication Year :
- 2006
-
Abstract
- Multilevel inverters are preferred over two-level inverters in high-voltage, high-power applications mainly because low-switching-frequency PWM schemes can be implemented with power devices of low-voltage ratings. Common multilevel inverter structures such as NPC, H-bridge and flying capacitor will produce a hexagonal voltage space vector structure. In the over-modulation range a multilevel inverter with a hexagonal voltage space vector structure will produce high amplitude 5th and 7th harmonic voltages in the output voltages. The maximum phase peak fundamental voltage is 0.637 Vdc in six-step mode operation (where Vdc is the radii of the hexagonal voltage space vector structure). A 12-sided polygonal voltage space vector structure will have a maximum phase peak fundamental voltage of 0.64 Vdc in the linear modulation range itself (where Vdc is the radii of the 12-sided polygonal voltage space vector structure), which is more than the output in six-step operation in the over-modulation range for a conventional multilevel structure. Also with a 12-sided polygonal space vector structure, an additional boost of the fundamental phase voltage is possible in the 12-step operation with the elimination of the 5th- and 7th- order harmonics (6n±1, n=1, 3, 5 ... etc). A multilevel inverter structure with 12-sided polygonal voltage space vector structure is proposed for an induction motor drive. The proposed inverter structure is realised by cascading three conventional two-level inverters. This makes the power bus structure very simple. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13502352
- Volume :
- 153
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- IEE Proceedings -- Electric Power Applications
- Publication Type :
- Academic Journal
- Accession number :
- 20707434
- Full Text :
- https://doi.org/10.1049/ip-epa:20050444