A Novel Hybrid Control Strategy for Grid-Connected PV-Battery Systems under Adverse Environmental Conditions

This work presents a new controller for gridconnected PV/Battery systems that combines a bidirectional battery controller with a voltage source converter (VSC) to solve problems caused by power fluctuations on the DC-link. The hybrid VSC controller is developed to maintain a continuous power supply on the DC-link. It does this by responding to changes in environmental factors and load fluctuations in the PV-generated output, which in turn triggers dynamic adjustments to the inverter pulse signals. To increase system stability, the bidirectional battery controller orchestrates the charge and discharge operations in collaboration with the hybrid VSC, optimizing power delivery to the grid. Through a detailed performance study of the proposed controller, faults on both the DC and AC sides of the system are analyzed and efficiently addressed. The controller proved important in enhancing power quality and decreasing harmonic distribution. Furthermore, the hybrid controller's performance is assessed under several one-day environmental situations. Ultimately, the results of simulation done in MATLAB/Simulink corroborate the usefulness of the suggested controller in providing optimal performance in the described grid-connected PV/Battery system.