Title :
Control of Improved Full-Bridge Three-Level DC/DC Converter for Wind Turbines in a DC Grid
Author :
Deng, Fujin ; Chen, Zhe
Author_Institution :
Dept. of Energy Technol., Aalborg Univ., Aalborg, Denmark
Abstract :
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.
Keywords :
DC-DC power convertors; passive filters; power filters; power generation control; power grids; power transformers; voltage control; wind turbines; DC-grid system; IFBTL DC-DC converter; improved full-bridge three-level DC-DC converter control; medium frequency transformer; modulation strategy; passive filter; voltage balancing control strategy; voltage stress reduction; wind turbines; Capacitors; DC-DC power converters; Passive filters; Pulse width modulation; Switches; Voltage control; Wind turbines; DC/DC converter; dc grid; full-bridge three-level (FBTL); permanent magnet synchronous generator; wind turbines;
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2012.2198835
