Novel Buck Mode Three-Level Direct AC Converter with a High Frequency Link

Lei Li; Yue Guan; Kunshan Gong; Guangqiang Li; Jian Guo

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자료유형: 학술저널

저자정보: Lei Li (Nanjing University of Science and Technology) Yue Guan (Nanjing University of Science and Technology) Kunshan Gong (Nanjing University of Science and Technology) Guangqiang Li (Nanjing University of Science and Technology) Jian Guo (Nanjing University of Science and Technology)

저널정보: 전력전자학회 JOURNAL OF POWER ELECTRONICS JOURNAL OF POWER ELECTRONICS Vol.18 No.2

발행연도: 2018.3

수록면: 407 - 417 (11page)

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A novel family of Buck mode three-level direct ac converters with a high frequency link is proposed. These converters can transfer an unsteady high ac voltage with distortion into a regulated sinusoidal voltage with a low THD at the same frequency. The circuit configuration is constituted of a three-level converter, high frequency transformer, cycloconverter, as well as input and output filters. The topological family includes forward, push-pull, half-bridge, and full-bridge modes. In order to achieve a reliable three-level ac-ac conversion, and to overcome the surge voltage and surge current of the cycloconverter, a phase-shifted control strategy is introduced in this paper. A prototype is presented with experimental results to demonstrate that the proposed converters have five advantages including high frequency electrical isolation, lower voltage stress of the power switches, bi-directional power flow, low THD of the output voltage, and a higher input power factor.

#Buck mode #Direct ac converter #High frequency link #Three-level (TL)

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