Nonlinear Controller for Buck Boost Converter for Photovoltaic System

Abstract

This paper proposes the advancement and perfection design of nonlinear controller for buck boost converter to maintain output voltage of the PV generation to be used in DC micro grid by implementing SMC for Buck-Boost converter and will perform simulation based analysis of buck-boost converter connected with PV generation and controlled by proposed control scheme. There are two parts in the proposed controller scheme namely linear and non-linear portion. PI controller comprise of linear part hysteresis control implements nonlinear part. The PI controller and hysteresis control are used to control output voltage loop and inductor current ripple respectively. The selection of the ON/OFF points of hysteresis control are based on ripple produced in inductor current. The simulation of the proposed controller for buck-boost converter performed in MATLAB®/SIMULINK® software.