Abstract
This work presents a control scheme to control a grid-connected single-phase photovoltaic (PV) system. The considered system has four 250 W solar panels, a non-inverting buck-boost DC-DC converter, and a DC-AC inverter with an inductor-capacitor-inductor (LCL) filter. The control system aims to track and operate at the maximum power point (MPP) of the PV panels, regulate the voltage of the DC link, and supply the grid with a unity power factor. To achieve these goals, the proposed control system consists of three parts: an MPP tracking controller module with a fuzzy-based modified incremental conductance (INC) algorithm, a DC-link voltage regulator with a hybrid fuzzy proportional-integral (PI) controller, and a current controller module using a linear quadratic regulator (LQR) for grid-connected power. Based on fuzzy control and an LQR, this work introduces a full control solution for grid-connected single-phase PV systems. The key novelty of this research is to analyze and prove that the newly proposed method is more successful in numerous aspects by comparing and evaluating previous and present control methods. The designed control system settles quickly, which is critical for output stability. In addition, as compared to the backstepping approach used in our past study, the LQR technique is more resistant to sudden changes and disturbances. Furthermore, the backstepping method produces a larger overshoot, which has a detrimental impact on efficiency. Simulation findings under various weather conditions were compared to theoretical ones to indicate that the system can deal with variations in weather parameters.
Highlights
Renewable energy is emerging as one of the main sources of energy for the future
This paper considers a grid-connected PV system consisting of two stages of power
Based on fuzzy control and an linear quadratic regulator (LQR), this study provides a comprehensive control solution for grid-connected single-phase PV systems
Summary
Renewable energy is emerging as one of the main sources of energy for the future. The key reason for this is the depletion and pollution of fossil fuels. Renewable energy sources are available, clean, eco-friendly, and cost-effective. There are various types of renewable energy sources, of which solar and wind energy systems have become more and more popular in many countries. According to [1,2], harmonic resonances, which often occur in grid-connected wind power farms, cause negative effects on the power quality of the grid. Solar energy is widely used around the world and demonstrates impressive results. To effectively obtain electricity from solar energy, photovoltaic (PV) systems should be installed. The system efficiency is strongly affected by two major factors, as follow [3,4]:
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
