Grid Connected PV/Wind System Control Techniques for under Distortions and Unbalance Fault Conditions

Abstract

This study emphasizes the importance of developing algorithms for controlling and synchronizing voltage source inverters (VSIs) used as power conditioners in grid-connected PV systems for renewable energy. The main goal is to develop and improve algorithms that ensure grid inverters work properly, especially during utility grid disruptions including voltage imbalances, frequency fluctuations, and harmonic distortions. The goal is to demonstrate collaboration clearly. Power quality standards are crucial. The control method uses a proportional resonant (PR) controller with harmonic compensation to improve system efficiency during disturbances. The synchronizations algorithm uses a dual second-order general-purpose integrator frequency-locked loop (DSOGI-FLL). MATLAB/SIMULINK from Math Works, Inc. simulates both techniques to verify their usefulness. This research improves our knowledge and technology of grid-connected solar systems. It provides a complete solution to ensure these systems work optimally and meet power quality criteria during grid outages. This study uses incremental conductance maximum power point tracking (MPPT) and perturb and observe (P&O) methods to overcome restrictions in grid-connected photovoltaic (PV) systems.  Fuzzy logic regulators ensure rapid dynamic response, minimize grid current variations, and stabilize voltages within the constant current band, addressing these issues. The proposed approach was thoroughly analyzed, including MATLAB simulations and mathematical calculations. Comparative analysis shows good dynamic performance and improved grid power utilization, proving the utility of the suggested control approach.