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Power balancing control of a multilevel converter using high-frequency multi-winding transformer

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5 Author(s)
Chunyang Gu ; Dept. of Electr. Eng., Tsinghua Univ., Beijing, China ; Zedong Zheng ; Yongdong Li ; Hongwei Ma
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A novel multilevel converter is proposed where a high-frequency multi-winding transformer is applied to realize the isolation and energy balance instead of the conventional phase-shifting transformer. In the proposed topology, all of the DC buses are connected to the same high-frequency multi-winding transformer through separated H-bridge units. Load powers can be equalized among different windings by the energy delivery using transformer flux. Furthermore, the equivalent circuit is proposed consist of the high-frequency voltage source and high-frequency multi-winding transformer. The power relations between these H-bridge cells are analyzed. Based on these relations, power exchange law among different transformer windings is obtained with high-frequency square wave inputs and outputs. Moreover, a control strategy for power balancing by adjusting the phase of input voltage on each H-bridge unit is proposed. Experimental results are given to validate the proposed strategy.

Published in:

Power Electronics and Motion Control Conference (IPEMC), 2012 7th International  (Volume:3 )

Date of Conference:

2-5 June 2012