Photovoltaic Stand-Alone Scheme Based Grid Connection Applications

Abstract

In this concept PV-based stand-alone scheme for application in rural areas is proposed. Photovoltaic (PV) has become one of the most promising candidates among the available RESs. However, the availability of PV power is intermittent in nature, and hence, PV-based stand-alone systems need an energy storage element which is generally realized by utilizing a battery bank. 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 grid-connected photovoltaic power system, or grid-connected PV system is an electricity generating solar PV system that is connected to the utility grid. A grid-connected PV system consists of solar panels, one or several inverters, a power conditioning unit and grid connection equipment. The proposed concept is further implemented with Grid Connection based PV System simulated using Matlab/simulink software.