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The study illustrates a study of fractional order proportional-integral-derivative (FOPID) controller using active disturbance rejection controller. The strategy is applied to a helicopter model of multiple input multiple output system after designing with tuned controller parameters. The motive of the system is to accomplish the control criteria and to investigate the stability of the structure using the principle of non-integer PID controller with a nonlinear feedback and active disturbance rejection. The immense criteria for stability analysis of the coupled system along with the disturbance rejection characteristics are given here in this study. Two new fractional variables as λ and μ are introduced to get better performance. In addition, disturbance control is also implemented from the designed controller.

Using an anti-windup property an illustrative example of multivariable system is provided here in this study. An estimator has been designed using the logic anti-windup, where proportional integral control law is applied to perform the analysis. Controlling a single input single output system is very simple but for a multivariable system controlling becomes complex. The estimator is activating the observer and using parameters unknown states of the plant estimated. Now using this control logic unwanted external disturbances also was mitigated using the anti-windup state observer based controller (AWC).