Title: Upgradation of the automatic voltage regulator dynamic response by an optimally tuned fractional order controller

Authors: Manjusha Silas; Surekha Bhusnur

Addresses: Department of Electrical Engineering, Bhilai Institute of Technology, Durg, Chhattisgarh, India ' Department of Electrical and Electronics Engineering, Bhilai Institute of Technology, Durg, Chhattisgarh, India

Abstract: The performance of an automatic voltage regulator (AVR) system is of prime importance in the power system. This work contributes a significant approach to enhance the performance of an AVR system using a fractional order PID (FOPI^λD^μ) controller. The parameters of the FOPI^λD^μ controller are tuned by five optimisers with different objective functions and the performance indices are compared. A new cost function, obtained by combining the objectives of Zwe-Lee Gaing (ZLG) and the integral of squared-error (ISE), is proposed along with mayfly optimiser, to produce an output that depicts optimal performance indices. Robustness analysis of the aforesaid system is done by allowing parametric uncertainties in the AVR parameters individually. Simulation results depict optimum overshoot, settling time, close to optimum, rise time and a reasonable robustness. The proposed cost function with mayfly optimiser has shown a better performance against other tested cost functions and optimisers in an AVR system.

Keywords: AVR system; FOPI^λD^μ controller; optimiser algorithms; robust control; cost function.

DOI: 10.1504/IJMIC.2024.139091

International Journal of Modelling, Identification and Control, 2024 Vol.44 No.4, pp.328 - 340

Received: 25 Nov 2022
Accepted: 28 Feb 2023
Published online: 13 Jun 2024 *

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