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New multi-stage DC-DC converters for grid-connected photovoltaic systems

Lookup NU author(s): Dr Yihua Hu, Dr Wenping Cao, Dr Bing Ji


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Renewable energy is high on international and national agendas. Currently, grid-connected photovoltaic (PV) systems are a popular technology to convert solar energy into electricity. Existing PV panels have a relatively low and varying output voltage so that the converter installed between the PVs and the grid should be equipped with high step-up and versatile control capabilities. In addition, the output current of PV systems is rich in harmonics which affect the power quality of the grid. In this paper, a new multi-stage hysteresis control of a step-up DC-DC converter is proposed for integrating PVs into a single-phase power grid. The proposed circuitry and control method is experimentally validated by testing on a 600W prototype converter. The developed technology has significant economic implications and could be applied to many distributed generation (DG) systems, especially for the developing countries which have a large number of small PVs connected to their single-phase distribution network. © 2014 Elsevier Ltd.

Publication metadata

Author(s): Hu Y, Cao W, Ji B, Si J, Chen X

Publication type: Article

Publication status: Published

Journal: Renewable Energy

Year: 2015

Volume: 74

Pages: 247-254

Print publication date: 01/02/2015

Online publication date: 24/08/2014

Acceptance date: 04/08/2014

ISSN (print): 0960-1481

Publisher: Elsevier Ltd


DOI: 10.1016/j.renene.2014.08.009


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