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A New Multilevel Converter Topology With Reduced Number of Power Electronic Components

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3 Author(s)
Ebrahimi, J. ; Electr. Eng. Dept., Amirkabir Univ. of Technol., Tehran, Iran ; Babaei, E. ; Gharehpetian, G.B.

In this paper, a new topology for cascaded multilevel converter based on submultilevel converter units and full-bridge converters is proposed. The proposed topology significantly reduces the number of dc voltage sources, switches, IGBTs, and power diodes as the number of output voltage levels increases. Also, an algorithm to determine dc voltage sources magnitudes is proposed. To synthesize maximum levels at the output voltage, the proposed topology is optimized for various objectives, such as the minimization of the number of switches, gate driver circuits and capacitors, and blocking voltage on switches. The analytical analyses of the power losses of the proposed converter are also presented. The operation and performance of the proposed multilevel converter have been evaluated with the experimental results of a single-phase 125-level prototype converter.

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Industrial Electronics, IEEE Transactions on  (Volume:59 ,  Issue: 2 )