AN INTERLEAVED HIGH FREQUENCY FLYBACK MICRO-INVERTER USING SLIDING MODE CONTROL ALGORITHM

Abstract

The presence of nonlinear voltage current characteristic with a unique Maximum Power Point (MPP) is usually found in PV panels. When their
operating conditions are subjected to changes, the MPP will also change. This project aims at the design and implementation of a stand-alone
micro inverter for Photovoltaic (PV) applications based on interleaved fly back converter using Sliding Mode Control (SMC) algorithm. Here, a
fly back converter is designed at high power rating and its practicality with good performance is demonstrated. A sliding mode controller is used
to estimate the MPP which forces the PV system to operate at MPP and to stay on the surface at all times. This method is simple and robust to
irradiance and temperature variations. A simulation model is developed and the design is then verified and optimized for best performance based
on the simulation results. Finally, a prototype at rated power is built and evaluated under realistic conditions.