Robust Integral Terminal Sliding Mode Control of three phase voltage source converter for PV Grid Connected System

Abstract

This paper proposes a robust integral terminal sliding mode control (ITSMC) strategy for a three-phase two-level voltage source converter used in photovoltaic power generation systems. The main goal of the proposed controller is to steer the system state along a predefined sliding surface while mitigating the chattering phenomenon. This development aims to significantly improve system performance by reducing overshoots and solving real-world PV challenges such as irradiation fluctuations, all while achieving a faster dynamic response. To demonstrate the robustness of the ITSMC controller, it is subjected to varying irradiation levels and measurement noise. MATLAB/Simulink software is employed for simulation and validation of the proposed system. Comparative analysis reveals that the proposed controller outperforms conventional sliding mode controller in terms of current overshoots and dynamic response. These findings demonstrate compliance with the criteria outlined in IEEE Std 519-2014.