MATLAB Based Grid Connected Single Phase Rooftop PV System

Abstract

Nowadays renewable energy sources are widely used such as wind energy and solar energy, due to their extreme abundance. So they should be properly interfaced with the power grid with suitable devices. In this paper a system of Photovoltaic (PV) proposes attractive alternative source of generation because these can be placed near to the load centers means we can place these systems on the top of our house roofs when compared with other renewable source of generation and can be easily interfaced to distribution systems. Maximum power point tracking topology is designed to extract the maximum power from solar panel. Generally rooftop PV system consists of battery backup and supports the off grid load efficiently without interruption of power but here a NPC three level inverter is implemented for injecting the real power of the renewable power into the grid to reduce the switching power loss, harmonic distortion with single phase synchronous reference frame (SRF) theory based current controlled Pulse Width Modulation (PWM) controller to realize maximum generated power evacuation by maintaining the DC link voltage constant without battery support, low THD sinusoidal line synchronized current output, and a capacitor connected parallel to input terminal of inverter provides the limited reactive power compensation based on the unutilized capacity of the inverter. Simulation results are observed to analyze the working of rooftop PV with proposed control algorithms in grid connected mode with limited reactive power conditioning under linear load conditions.