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1. ECWAY TECHNOLOGIES
2014-15 IEEE Software | Embedded | Mechanical Projects Development
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TWO-STAGE SOLAR PHOTOVOLTAIC-BASED STAND-ALONE SCHEME HAVING BATTERY
AS ENERGY STORAGE ELEMENT FOR RURAL DEPLOYMENT
ABSTRACT
Solar photovoltaic (PV)-based stand-alone systems have evolved as a promising solution to the issue
of electrification in areas where the grid is not available. The major challenges in designing such systems are
as follows: 1) extraction of maximum power from the PV array; 2) protection of the battery from overcharge
and over discharge; 3) dc to ac conversion; and 4) provision for adequate voltage boosting. As multiple
objectives are required to be satisfied, the existing schemes for stand-alone systems require a minimum of
three converter stages, leading to considerable reduction in the reliability and efficiency of the system. In
order to address this issue, a two-stage stand-alone scheme consisting of a novel transformer coupled dual-
input converter (TCDIC) followed by a conventional full-bridge inverter is proposed in this paper.
The proposed TCDIC can realize maximum power point tracking and battery charge control while
maintaining the proper voltage level at the load terminal. The small signal mathematical model of the
TCDIC is derived. A suitable control strategy for the proposed TCDIC is devised. The operation of the
scheme is verified by performing detailed simulation studies. A laboratory prototype of the scheme is
developed. Detailed experimental validation of the scheme utilizing the laboratory prototype is carried out to
confirm the viability of the scheme.
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