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Switching Frequency Analysis of Modular Multilevel Converter Based on the Improved Capacitor Voltage Balancing Algorithm |
Huang Shoudao,Liao Wu, Gao Jian, Huang Sheng ,Rong Fei |
College of Electrical and Information Engineering Hunan University Changsha 410082 China |
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Abstract This paper derives the analytical expressions of the modular multilevel converter (MMC) average switching frequency based on the inproved maximum sub-module voltage deviation,and analyzes the factors that affect the switching frequency.This paper can provide a theoretical guidance for the loss calculation and thermal design of MMC.The case studies are performed on a 46-level single-phase MMC under different operating conditions in Matlab/Simulink which proves the accuracy of this method.Meanwhile,a 9-level single-phase MMC laboratory prototype is built to verify the effectiveness of this method.
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Received: 24 March 2015
Published: 15 July 2016
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