Upgradation of the automatic voltage regulator dynamic response by an optimally tuned fractional order controller Online publication date: Thu, 13-Jun-2024
by Manjusha Silas; Surekha Bhusnur
International Journal of Modelling, Identification and Control (IJMIC), Vol. 44, No. 4, 2024
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 (FOPIλDμ) controller. The parameters of the FOPIλDμ 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.
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