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

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

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

Vol. 18, No. 2, pp. 407-417, Mar. 2018

10.6113/JPE.2018.18.2.407

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Abstract

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.

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Cite this article

[IEEE Style]

L. Li, Y. Guan, K. Gong, G. Li, J. Guo, "Novel Buck Mode Three-Level Direct AC Converter with a High Frequency Link," Journal of Power Electronics, vol. 18, no. 2, pp. 407-417, 2018. DOI: 10.6113/JPE.2018.18.2.407.

[ACM Style]

Lei Li, Yue Guan, Kunshan Gong, Guangqiang Li, and Jian Guo. 2018. Novel Buck Mode Three-Level Direct AC Converter with a High Frequency Link. Journal of Power Electronics, 18, 2, (2018), 407-417. DOI: 10.6113/JPE.2018.18.2.407.