Improved fractional [formula omitted] controller for AVR system using Chaotic Black Widow algorithm

Abstract

Optimal tuning of fractional order proportional integral derivative (FOPID) controller parameters for automatic voltage regulator (AVR) system is a complex problem which requires the solution of real order integral and differential equations. Therefore, a novel optimization technique called Chaotic Black Widow Optimization (ChBWO) algorithm is proposed to tune the parameters of the FOPID controller. A new cost function is defined with a combination of Zwe-Lee Gaing’s (ZLG) and integral of time multiplied absolute error (ITAE) objectives. The proposed controller performance (rise time, settling time, and overshoot) is compared with the existing state-of-the-art techniques. To verify the robustness of the proposed controller the plant parameters are deviated from -50% to 50%. The simulation results show that the proposed controller is robust to variations in plant parameters. Moreover, disturbance analysis is also carried out by incorporating sudden changes in the reference signal. The results demonstrate that the controller is stable, robust, and sustains the sudden disturbances.