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Control of Improved Full-Bridge Three-Level DC/DC Converter for Wind Turbines in a DC Grid

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2 Author(s)
Fujin Deng ; Dept. of Energy Technol., Aalborg Univ., Aalborg, Denmark ; Zhe Chen

This paper presents an improved full-bridge three-level (IFBTL) dc/dc converter for a wind turbine in a dc grid by inserting a passive filter into the dc/dc converter to improve the performance of the converter. The passive filter can effectively reduce the voltage stress of the medium frequency transformer in the IFBTL dc/dc converter. A modulation strategy, including two operation modes, is proposed for the IFBTL dc/dc converter. Then, a voltage balancing control strategy is proposed for the IFBTL dc/dc converter. Furthermore, the control of the wind turbine based on the IFBTL dc/dc converter in a dc-grid system is presented. Finally, a small-scale IFBTL dc/dc converter prototype was built and tested in the laboratory, and the results verify the theoretical analysis.

Published in:

Power Electronics, IEEE Transactions on  (Volume:28 ,  Issue: 1 )