Proposed inverter topology and control circuit for the proposed grid connected photovoltaic system: Description and design specification

The need for a cleaner environment and the continuous increase in energy demands makes decentralized renewable energy production more and more important. Photovoltaic generate electric power when illuminated by sunlight or artificial light. It directly convert the sun's energy into electricity which can be easily transported and converted to other forms for the benefit of society. The role of power electronics converter is very important in the PV systems. The electricity generated by a PV module is in the form of direct current (DC). Transformation of direct current to alternating current (AC) required by many common appliances and for grid-connection is achieved with inverter system. Buck Boost converter is used to boost the photovoltaic voltage at the required high level also act as a Maximum Power Point Tracking (MPPT) controller together with MPPT algorithm to extract the maximum power from the photovoltaic module. In this topology, the photovoltaic module is the source of energy, the DC/DC buck boost converters is to adjust the DC-link voltage, tracks the maximum power and boost the PV voltage to the DC/AC H bridge inverter injects the AC currents to the load or gr id. The result is used for the Simulink block as a current source to obtain the voltage and current delivered from PV.