Improved Robust Controller Design for Stabilization of Grid-Tied Photovoltaic System

Abstract

It is necessary to control the aspects such as injected current to the three-phase grid, power factor and dc-link voltage to extract maximum power from the photovoltaic (PV) system so as to improve the results of a three-phasegrid-tied PV system. A Robust Input Output Partial Feedback Linearization Control (RIOPFLC) approach is proposed to control these factors to stabilize the three-phasegrid-tied system. This paper proposes an approach that robust in control and ensures the occurrences of uncertainties will not affect the PV system model. These uncertainties are examined based on the provided matching conditions using MATLAB/SIMULINK at different contingency and changes in atmospheric conditions. From simulation results, it is observed that the RIOPFLC provide better performance in the above parameters at different operating conditions.