Design and analysis of standalone photovoltaic for synchronous SEPIC Converter with grid connected system

Abstract

This paper describes a grid connected photovoltaic system with SEPIC DC-DC converter.The DC-DC SEPIC converter using pulse width modulation has been designed grid PV module. The conversion efficiency of the proposed SEPIC converter system is increased when PWM is used as a control scheme.  The single-ended primary-inductance converter (SEPIC) is a step-down/step-up DC/DC converter circuit that provides a constant positive output voltage from a positive input voltage which can be lower or higher than the output. This kind of DC/DC converters is very important when the output voltage has to be maintained constant, it can be used in open loop without any IP controller. Solar photovoltaic conversion is based on the photovoltaic effect to transform a part of energy of the sun to electricity. This technology requires little maintenance but it needs a good implementation of the DC-DC or/and DC-AC converters to obtain high efficiencies. To make the converter operates in its continuous conduction mode, it must be synchronized. The input quantities acting on the photovoltaic generator are the irradiance and the temperature; the controller parameters are the pulse width modulation (PWM) signals that control the converter’s switches by introducing the right duty cycle.