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Thermal and efficiency analysis of five-level multi-level clamped multilevel converter considering grid codes

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4 Author(s)
Ma, K. ; Dept. of Energy Technol., Aalborg Univ., Aalborg East, Denmark ; Munoz-Aguilar, R.S. ; Rodriguez, P. ; Blaabjerg, F.

In this paper a five-level Multi-Clamped Multilevel Converter (5L-MLC2) topology is analyzed based on a typical grid integration application for renewable energy generation system. The loss and thermal distribution of the power devices in different switching legs are investigated and illustrated under rated operation. Afterwards, a loss and efficiency evaluation method is proposed and applied which takes into account various reactive power operation boundaries regulated by the grid codes. It is concluded that the 5L-MLC2 multilevel topology shows a good and consistent efficiency characteristic under different output active powers when complying with the active/reactive power operation range regulated by e.g. the German grid codes.

Published in:

Energy Conversion Congress and Exposition (ECCE), 2012 IEEE

Date of Conference:

15-20 Sept. 2012

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