Title: Enhancing power quality in hybrid renewables with UPQC-FOPID control

Authors: N. Bharat Mohan; B. Rajagopal; D. Hari Krishna

Addresses: Department of Electrical Engineering, Annamalai University, Chidambaram 608002, Tamil Nadu, India ' Department of Electrical Engineering, Annamalai University, Chidambaram 608002, Tamil Nadu, India ' Electrical and Electronics Engineering Department, Maturi Venkata Subba Rao (MVSR) Engineering College, Hyderabad, India

Abstract: This work proposes an intelligent control technique for grid-connected hybrid power systems with SPV, wind turbines, and battery storage, with the goal of enhancing power quality. The unified power quality conditioner (UPQC) employs a sand cat swarm-based dwarf mongoose (SCS-DM)-based FOPID controller to adjust for PQ issues, such as sag, swell, interruptions, real power, reactive power, and total harmonic distortion (THD) reductions connected to voltage/current through the use of series and shunt filter control methods. The fractional order proportional integral derivative controller (FOPID) controller uses the filters to compensate for the power quality (PQ) problems by injecting the required power. The suggested SCS-DM optimisation algorithm is used to optimise the FOPID parameters, for improved performance. The primary goal is to control voltage while lowering THD and power loss. The suggested methodology's efficacy in enhancing PQ is confirmed by contrasting its performance with that of traditional methods.

Keywords: renewable energy sources; RES; battery energy storage systems; unified power quality controller; FOPID controller; optimisation.

DOI: 10.1504/IJPELEC.2026.150275

International Journal of Power Electronics, 2026 Vol.22 No.1, pp.1 - 44

Received: 23 Jun 2024
Accepted: 02 Mar 2025
Published online: 06 Dec 2025 *

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