Abstract
In recent days the fractional order proportional integral differential (FOPID) controller took the place of conventional PID controller because of their proven advantages. FOPID can be used in various science and engineering applications due to comparable stability factor over PID. Research is still going on to develop tune methods for FOPID applying in existing control systems. This paper deals with the comparative studies on design of fractional order proportional integral differentia (FOPID) controller. The two well known tuning methods are described for the design of FOPID controller's parameters. The first design technique is Ziegler-Nichols tuning method for FOPID and the second technique is Astrom-Hagglund method for FOPID controller. The design techniques are described by a second order integer order plant and its robustness is checked by the simulation. In addition to that there is a comparison studies between these two methods.
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