IJCAS

In distributed closed-loop control systems like wireless networked control systems (WNCS), handling sensor-to-controller delay, controller-to-actuator delay, packet dropouts at the controller, and packet dropouts at the actuator is challenging. Hence in the wireless environment, the superiority and flexibility of fractional-order PID controllers are investigated for integer order-integer order (IO-IO), fractional order-integer order (FO-IO), integer order-fractional order (IO-FO), and fractional order-fractional order (FO-FO) wireless networked control systems in this paper. The kernel and standalone approaches are used for wireless channels IEEE 802.11b (WLAN) and IEEE 802.15.4. It has been shown with extensive simulation studies that a fractional-order PID controller eliminates a large overshoot in output response compared to an integer-order PID controller in some systems. Further, it also considerably reduces rise time and settling time. Performances of FO-PID and IO-PID controllers are investigated under parametric uncertainty of integer and fractional-order plants. Also, the performances of FO-PID and IO-PID controllers are investigated in the presence of external disturbance at the input of integer and fractional-order plants.

Keywords: Controller to actuator delay, FO-FO wireless NCS, IO-FO wireless NCS, parametric uncertainty, random packet loss, sensor to controller delay, standalone approach.