Development of a Didactic Graphical Simulation Interface on MATLAB for Systems Control

This paper presents a graphical interface developed on Matlab to control first-order systems. Taking this function into account, the user can perform the system identification through Alfaro, Bröida, Ho et al., Smith and Vítečková. After, it is possible to choose the control method, Ziegler-Nichols and Cohen-Coon. In this way, the user will be able to obtain the system’s response if a continuous PID control is applied, either by Ziegler-Nichols or Cohen-Coon, as well as the controller P (Proportional), I (Integrative), and D (Derivative). In addition, the user will also be able to choose a specific discretization method to obtain the system response for a discrete PID controller also from Ziegler-Nichols and Cohen-Coon. The setpoint, sampling time, and modification of the constants P, I, and D can be changed. The discretization methods are Zero Order Hold, Triangular Approximation, and Tustin. Thus, the system’s response to the discrete PID control can be obtained. The developed interface demonstrated the importance of didactic platforms for control systems through this practicality.