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Analysis of Space Vector Diagram of a Modular H-Bridge Converter with Bypassed Cells during Fault Condition
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| Author(s) |
HARSHA VARDHAN |
| Abstract |
This paper proposes a new analysis for the fault tolerant operation of Modular H-Bridge Converterusing space vector diagram. The converter can be operated during fault condition after bypassing offaulty cells. Geometrical analysis is included to create balanced line voltages from unbalanced polevoltages due to bypass of faulty cells. The space vector diagram of unbalanced pole voltages becomesan irregular six sided polygon and depending on the number of cells faulty, the space vector diagramalters its shape. Sine-triangle based implementation of the space vector diagram is used to derive ageneral expression for common mode voltage. The modulation index is maximized by addition ofcommon mode voltage. The biggest circle inscribed the irregular six sided polygon gives anexpression for the maximum modulation index. The modified reference waveform is used in LevelShifted Pulse Width Modulation (LSPWM) technique for the converter topology. Simulation andexperimental results are included to validate the proposed strategy. |
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| Filename: | 0120-epe2017-full-05585245.pdf |
| Filesize: | 1.248 MB |
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| Type |
Members Only |
| Date |
Last modified 2018-04-17 by System |
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