This paper compares the frequency domain performance criterion (Jv) of PI, fractional PI, and PID controllers when a step load disturbance is applied at the plant input. Process information is available in form of first-order plus dead-time (FOPDT) model. In addition, the controllers were compared using the H∞–norm of the sensitivity function as a measure of robustness, and some comments on ind...

This paper deals with design of continuous-time robustly stabilizing Proportional-Integral (PI) controllers for interval systems using the combination of Kronecker summation method, sixteen plant theorem and an algebraic approach to controller tuning. The effectiveness and practical applicability of the proposed method is demonstrated in both simulation and real experiments including control of...

Autotuning methods are typically conceived as procedures, thus need simulating as digital blocks. However, when no autotuning is in progress, it is far more efficient to represent the tuned controller as a continuous-time system, to exploit variable-step integration. This manuscript presents the first nucleus of a Modelica library of autotuning controllers, where the problem just mentioned is t...

Exposure to hazardous concentrations of volatile organic compounds indoors in small workshops could affect the health of workers, resulting in respirative diseases, severe intoxication or even cancer. Controlling the concentration of volatile organic compounds is required to prevent harmful conditions for workers in indoor environments. In this document, PI and fuzzy PI controllers were used to...

The use of DC/DC voltage converters is widespread and has been studied and improved for a long time. Its nonlinearities and uncertainties have increased the complexity of associated controllers so desired performance is achieved. However, cascade-PI controllers are still used to address this problem due to its relative implementation easiness, relegating the complexity to the tuning strategy. T...

The controllers of standard PI and PID type play the essential role in contemporary industrial practice. Therefore, the simple techniques of controller tuning are still demanded, especially in case that these algorithms are able to cope with various uncertain conditions. The contribution is focused on control design for interval systems using the computation of all possible stabilizing PI contr...

Educational issues of Proportional, Integral (PI) and Proportional, Integral, and Derivative (PID) type controller design in undergraduate course on control, graduate course on control, advanced control topics are discussed. The main attention is devoted to multi-time-scale control systems where PI PID type controllers designed for nonlinear systems in the presence of plant parameter variations...

The aim of this work is to study the primary control system of a hydropower plant in isolated mode. The power plant is modeled by differential equations and results are compared to field data from an actual hydropower plant, presenting deviations lower than 1.0%. The study of primary control system is conducted in order to define useful sets of parameters for controllers. Four controllers are s...

For several decades, PID (Proportional-Integral-Derivative) control has succesfully been applied to numerous industrial processes for regulating them. The PID controller has indisputably become a backbone of every automation system being available for controlling a large scale of industrial processes. However, it has also other capabilities than just that for regulating processes by manipulatin...

— The objective of this work is to nd out optimum settings for a fractional PI D controller in order to ful l ve different design speci cations for the closed-loop system, taking advantage of the fractional orders, and . Since these fractional controllers have two parameters more than the conventional PID controller, two more speci cations can be met, improving the performance of the system. Fo...