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Dynamic performance analysis of an integrated windphotovoltaic microgrid with storage

Author(s): Lawrence K. Letting*, Josiah L. Munda, Yskandar Hamam
Tshwane University of Technology, Pretoria, South Africa
International Journal of Smart Grid and Clean Energy, vol. 3, no. 3, July 2014: pp. 307-317
ISSN: 2315-4462 (Print)
ISSN: 2373-3594 (Online)
Digital Object Identifier: 10.12720/sgce.3.3.307-317

Abstract: This paper presents a power and energy management strategy for a wind-photovoltaic (PV) microgrid with an energy storage system (ESS) and PV array current injection on the DC-link. The ESS consists of a battery and a supercapacitor interfaced to the DC-link through bi-directional DC-DC converters. Cascade PI control is used to regulate the current supplied by the ESS to the DC-link. A fuzzy logic controller is proposed for efficient power sharing between the battery and the supercapacitor. A discrete-time simulation model is used to study the microgrid operation. The PV array model is implemented as an s-function. Using the proposed system, the power supplied to the grid is maintained at the desired reference value during changes in wind speed, solar radiation, and grid power demand. Results also show that the ESS improves the DC-link voltage stability during three-phase to ground faults.
Keywords: dfig, wind, photovoltaic, dc bus, storage

Full Paper.pdf

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