The aim of this work is to design an automatic voltage regulation system by selection of FOPID parameters. In this work the advantage of FOPID controller over Conventional PID controller is discussed using MATLAB/Simulink. PID (proportional-integral-derivative) control is one of the earlier control strategies. Its early implementation was in pneumatic devices, followed by vacuum and solid state analog electronics, before arriving at today"s digital implementation of microprocessors. But in the

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... ast decade, fractional-order dynamic systems and controllers has been studying widely in many areas of engineering and science. The concept of the fractional-order PID controllers was proposed by Podlubny in 1997 [1] . He also demonstrated the better response of this type of controllers, in comparison with the classical PID controllers, when used for the control of fractional-order systems. A method is presented based on idea of the Ziegler-Nichols and Cohen Coon for the tuning of PID controller. Motivated from the fact that the optimization techniques depend on initial estimates, Valerio and Costa have introduced some Ziegler-Nichols-type tuning rules for FOPIDs.