Experimental assessment of integral-type terminal sliding mode control designed for a single-phase grid-interlinked PV system

Abstract

Due to the increasing global adoption of grid-connected photovoltaic (PV) systems and their unpredictable power production behavior, as well as their interactions with the electrical network, PV system controllability is a major aspect that should be taken into consideration. The paper under discussion implements an integral-type terminal sliding mode control (ITTSMC) technique for a single-stage, single-phase grid-interlinked PV system. The ITTSMC approach is dedicated to feeding the electrical network with a sinusoidal current with low total harmonic distortion (THD), providing accurate reference tracking with a finite time convergence, and increasing the system robustness against parameter mismatch and climatic conditions variation. In pursuit of this goal, the system's mathematical model is established under the proposed method, and its stability is proved using Lyapunov stability criterion. Reliability and performance assessment of the suggested control scheme have been carried out through a numerical simulation using Matlab/Simulink software. In addition, laboratory experiments employing a PV panel and Dspace 1104 controller board-based test bench are executed. The results obtained from various scenarios have unequivocally demonstrated the superior effectiveness of the adopted approach concerning power quality and dynamic performances compared to other existing controllers.