Turkish Journal of Computer and Mathematics Education Vol.12 No.2 (2021), 780- 787 780 Research Article Research Article Stability analysis of Automatic Voltage Regulator using Fractional Order Controller K Muralidhar Goud a , C. Srisailam b , D. Sathish c , and D. Harsha d a K Muralidhar Goud, Department of EEE, Vardhaman College of Engineering, Shamshabad, Hyderabad. b C Srisailam, Department of EEE, ChaitanyaBharathi Institute of Technology (A), Hyderabad. c D. Sathish, Department of EEE, ChaitanyaBharathi Institute of Technology (A), Hyderabad. d D. Harsha, Department of EEE, ChaitanyaBharathi Institute of Technology (A), Hyderabad. Article History: Received: 11 January 2021; Accepted: 27 February 2021; Published online: 5 April 2021 _____________________________________________________________________________________________________ Abstract: We aim to design a fractional order robust control system. It is an advanced model of classic PID controller whose order will be non-integer.PID controller that we generally use has many advantages and disadvantages with respect to the disadvantages like, it doesn’t give accurate values of constants, exact values of the time domain parameters as well as frequency domain parameters of the control system and we have more robust problem. Wearable electronic based an automatic voltage regulator can automatically preservesthe terminal voltage of generator at a fixed value under varyingly load and operating temperature. AVR controls output by sensing the output voltage at a power-generating coil and compares it to a stable reference. The combination of fractional order controller with an automatic voltage regulator is proved to be better than conventional controllers. Key words: AVR, FOC, margins, PSS, IOPID ___________________________________________________________________________ 1. Introduction Oustaloup is the pioneer in the field of fractional order calculus. It was also known as command robusted order non-entier (CRONE) controller. It is employed in contrastive feedback control systems. In the recent times podlundy a scientist introduced a generalized fractional PID controller called the fractional order PID controller that offers many advantages and advanced than the classic PID controller that includes  (integrative action) and  ( derivative action ) as integral and derivative constants. It has wider scope of design (White, 1997; Yang, 2006; Sampath Kumar, 2020; Samardzic, 2017; Murugan, 2020; Aroulanandam, 2019) this fractional order PID controller is a better solution for many industrial problems and some applications. Generalized FOPID IS C(s) =   S K S K K d i P + + (1) The foremost work or intention of this FOPID controller is to find out those two constants and fulfill the additional specifications of the systems. Generally FOPID is represented as   D PI when 1 , 1 = =   , one can get classical PID. This FOPID increases the system total performance. 2. Design Specifications The aim to design the controller is to achieve the various stipulation regarding sturdiness to plant load disorders, reservations, high frequency noise and frequency domain specifications. In general for any control system gain margin and phase margin are the signs of strength. Further phase of the system is mutually connected to the damping ratio, so it can also be treated as the performance measure (Subhransu, 2011; Duarte, 2015). This system rejects the output disturbances. Steady state can be terminated. 3. Comparison of PID and FOPID Controllers The mathematical model of the conventional PID controller is. S K S K K d i P + + (2)