Analysis of Photovoltaic Micro-Inverter System using MPPT

In this paper a grid connected step up photovoltaic micro inverter system is analysed using maximum power point tracking technique. To maximize power output of the photovoltaic system using MPPT, the system components need to be optimized. Considering this the conventional central inverter is replaced by micro-inverters connected to each PV array. Micro inverters acts as power optimizers and increases the overall output power transferred to the load. As a result the efficiency of the system increases. The main focus of this paper is to connect a DC-DC converter in between the PV module and the load. Among the various converter topologies and MPPT methodology the most suitable combination has to be chosen. A compromise between cost and reliability is made and a step up three state switching converter is selected along with perturb and observe MPPT methodology. Simulation work is carried out using Powersim software.