Fractional order PI controller for nonlinear systems

In almost all industries the processes are nonlinear in nature. The nonlinear systems Preoccupied for study are the conical tank and spherical tank systems that is approximated to a first order equation. The control of level is carried out by using FOPIC technique. Fractional order calculus is a down order calculus having an area of arithmetic that has the derivative and integral from noninteger order. Fractional order PI controller (FOPIC) technique offers victory as a result of valuable methods in differentiation and integration and they offer additional flexibly in the controller design. This paper proposes the controller design for nonlinear systems using FOPIC. A relationship of this control technique with conventional Ziegler Nichols (ZNPI) controller and simulation be carried out by MATLAB simulink software.