Enhanced DC-Link Voltage Stability in Grid-Connected PV Systems via Three Recent Metaheuristic Optimizers: Towards High Penetration of PV Systems in Modern Power Systems

As more grid-connected PV units are being installed, it is becoming challenging to sustain DC bus voltage stability (DCBVS). Since optimization techniques are frequently employed to improve the control process, they are ideally adapted to the dynamic operating conditions of systems that are integrated with renewable energy. The goal of this research is to improve DCBVS in networked PV systems by optimizing PI controllers using the GRO method. The study emphasizes how important DCVS is to sustaining network dependability and legal compliance under different faults. Using important dynamic response parameters including OS, ST, and SSE, the accuracy of GRO is assessed in conjunction with that of PSO and the WOA in order to assess its efficacy. The GRO-based controller reduces VDC-OS by 4.75% when compared to PSO and by 2.85% when compared to WOA in a 3L-G fault. In addition, GRO has the quickest ST action, cutting the time by 2.75% when compared to PSO and WHO. When it comes to SSE accuracy, GRO has the smallest % inaccuracy. In total, the findings show that the GRO provides a useful approach for stabilizing the VDC under harsh faults.