Design of Robust Control Strategy for Non-linear Multivariable Systems with Delay, Parametric Uncertainty and External Disturbances

摘要

Historically, the process industry has recognized the important work of automatic control in the proper functioning of the production process. Although the preferred control strategy in most applications is the implementation of simple PID control loops (Proportional-Integral-Derivative), there are a number of characteristics which sometimes are not considered explicitly in the design of these PID controllers, such as delays, unmeasurable variables, parameter uncertainty, time variant systems, nonlinearities, constraints and multivariable interactions. Many developments of modern control theory are designed to face up these features, but the industry has been conservative in applying these tools. This has led many critics to say that there is a gap between theory and practice of control.