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A novel multi-port DC-DC converter for hybrid renewable energy distributed generation systems connected to power grid

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3 Author(s)
Qiang Mei ; Tianjin Univ., Tianjin ; Xu Zhen-lin ; Wei-Yang Wu

Multi-port power converters are promising in applications such as renewable power generation systems and distributed generation systems (DGS). In this paper a novel multi-port DC-DC converter with a high-frequency isolation transformer is presented for a grid-connected hybrid renewable energy DG system without battery storage. Full-bridge power converters are employed to realize bi-directional power flow between renewable generators, load and grid. Detailed analysis is provided for a four-directional power converter in a wind-photovoltaic distributed generation system. In addition, a two loop PI control scheme is proposed to achieve constant output voltage and exact power flow management. Theoretical analyses are verified by simulations in PSPICE and MATLAB.

Published in:

Industrial Technology, 2008. ICIT 2008. IEEE International Conference on

Date of Conference:

21-24 April 2008