Recloser-Fuse Coordination Recovery in Photovoltaic-Integrated Distribution Networks via Inverter Phase Angle Optimization by Quasi-Oppositional-Chaotic-Symbiotic Organisms Search Algorithm

The paper presents the first application of the Quasi-Oppositional-Chaotic-Symbiotic Organisms Search (QOCSOS) algorithm to optimize the phase angles of inverters, aiming to minimize the discrepancy in short-circuit currents before and after integrating photovoltaic (PV) systems. This approach maintains the recloser-fuse coordination under fuse-saving schemes to address the frequent transient faults occurring in distribution networks. Depending on the location and penetration level of PV systems, recloser-fuse coordination may lose its selectivity. However, this research demonstrates that adjusting the magnitude and phase angle of inverter short-circuit currents can restore coordination without modifying the protection device settings. While the magnitude of the inverter's short-circuit current is regulated based on its characteristics, the phase angle is optimized using the QOCSOS algorithm. The effectiveness of QOCSOS in optimizing inverter phase angles is validated regardless of the PV systems' capacities and locations in the distribution network. To showcase the efficacy of the solution, the study was applied to a 22 kV distribution feeder of Tay Ninh power company, and the results were further verified through simulations in the ETAP software.