Converter regulation of stand-alone photovoltaic system at low solar radiation

The paper presents a control and a power supply of a low power stand-alone photovoltaic system converter. In a stand-alone photovoltaic system load is generally supplied from a photovoltaic panel through a DC-DC converter. In simple photovoltaic system without a battery converter controller and other circuits are supplied from the photovoltaic panel. The systems are appropriate for low power application where continual power supply is not required. The systems have problem in low solar radiation because photovoltaic panel is not able to produce enough energy for running a converter. The proposed converter power supply switching on and regulation behaviour at low solar radiation level are described in the paper. The Matlab/Simulink was used for establishing a photovoltaic panel model and DC-DC converter model before the converter implementation. The converter is a boost type converter with a full-bridge. The modelled and experimental results are presented.