Hybrid optimal-FOPID based UPQC for reducing harmonics and compensate load power in renewable energy sources grid connected system - T. Anuradha Devi; G. Srinivasa Rao; T. Anil Kumar; B. Srikanth Goud; Ch. Rami Reddy; Mbadjoun Wapet Daniel Eutyche; Flah Aymen; Claude Ziad El-Bayedh; Habib Kraiem; Vojtech Blazek (PLoS ONE, 2024)