DC-AC switching converter modelings of a PV grid-connected system under islanding phenomena
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Author list: Chayawatto N., Kirtikara K., Monyakul V., Jivacate C., Chenvidhya D.
Publisher: Elsevier
Publication year: 2009
Journal: Renewable Energy (0960-1481)
Volume number: 34
Issue number: 12
Start page: 2536
End page: 2544
Number of pages: 9
ISSN: 0960-1481
eISSN: 1879-0682
Languages: English-Great Britain (EN-GB)
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Abstract
Nonlinear modeling of a dc-ac full-bridge switching converter PV grid-connected system under islanding phenomena is proposed. It is a model that can be easily derived by using simple analytical techniques. A state-space averaging technique (no linearization) and voltage source inverter with current control are performed as "large-signal modeling" that is used to analyze the dynamic response of load voltage under 3 different resistive loads: 125%, 100% and 25% of inverter output and RLC when the grid system is disconnected as well as a step change of load. The nonlinear equation from the proposed modeling is handled by MATLAB/SIMULINK. The results of the proposed model are compared with experiments and PSpice simulation which shows good agreement among them. Moreover, it is found that the proposed model consumes much less computation time than PSpice and does not encounter any convergence problem. ฉ 2009 Elsevier Ltd. All rights reserved.
Keywords
DC-AC full-bridge switching converter, PSpice, PV grid-connected, State-space averaging
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