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Theoretical analysis and control of the modular multilevel cascade converter based on double-star chopper-cells (MMCC-DSCC)

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3 Author(s)
Hagiwara, M. ; Dept. of Electr. & Electron. Eng., Tokyo Inst. of Technol., Tokyo, Japan ; Maeda, R. ; Akagi, H.

This paper presents the modular multilevel cascade converter based on double-star chopper-cells (MMCC-DSCC), which is intended for installation on the 6.6-kV Japanese industrial and utility distribution systems without using line-frequency transformers. The converter is characterized by an arm structure based on the module consisting of cascade connection of multiple bidirectional PWM chopper-cells and floating dc capacitors per arm. This arm structure requires voltage-balancing control for all the chopper-cells. However, the voltage control combining averaging- with individual-balancing controls imposes certain limitations on operating conditions. This paper proposes an arm-balancing control to achieve voltage balancing in all the operating conditions. The validity of the arm-balancing control as well as the theory developed in this paper is confirmed by computer simulation.

Published in:

Power Electronics Conference (IPEC), 2010 International

Date of Conference:

21-24 June 2010