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Enhanced Efficiency of MV Hybrid MMC under Extended Modulation using Si/SiC devices
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| Author(s) |
Rajat SHAHANE, Poornachandra Rao NALLAMATTI, Anshuman SHUKLA |
| Abstract |
The hybrid modular multilevel converter (MMC) consist of series connected half-bridge submodules (HBSMs) and full-bridge submodules (FBSMs) in each arms. The benefits of dc fault blocking and better dc link utilization in hybrid MMC have make them prominent choice for various medium voltage (MV) applications. However, with reduced SM count in MV hybrid MMC still requires additional filter due to the lower number of levels in the output voltage. This require larger filter which increases overall size and deteriorates the converter power density. The use of silicon carbide (SiC) MOSFETs over silicon (Si) IGBT allows high switching frequency operation which leads to reduced filter size, but increases overall cost. In this paper, a hybrid MMC is developed with Si/SiC based FBSM and Si based HBSM. Also, a novel modulation scheme is proposed which allocates all the high frequency function to the SiC devices while the Si devices are switched at relatively lower frequency. Further, simulation study and comparative loss analysis is carried out to prove the efficacy of the proposed system. |
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| Filename: | 0457-epe2023-full-09534525.pdf |
| Filesize: | 1.267 MB |
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| Type |
Members Only |
| Date |
Last modified 2023-09-24 by System |
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