Estudo de técnicas de controle digital robustas a variação no tempo de amostragem

Abstract

The digital control techniques for continuous systems with sampled data found in the literature consist mainly of synthesizing a discrete controller that satisfies the design requirements and then demonstrates the performance through control system simulations. This is because, in general, in discrete systems the sampling time is predefined, not a design parameter, a factor that supports a better control of the system. The objective of this work is the study of different digital control techniques that stabilize systems with sampled data. One of the techniques considered is based on the resolution of linear matrix inequalities, and considers the sampling time already in its design. Another technique is based on pole allocation, which aims to allocate the poles of the system where desired. Finally, a technique that uses the place of roots for control will also be analyzed. Initially, different strategies will be used, such as control by LMI synthesis, root location control and pole allocation. The different techniques will be analyzed by their application in a system with sampled data, observing its performance, advantages and disadvantages. Then, a robust digital control technique is proposed that allows the control with the same values ??of gains, even if variation in sampling time occurs, and its performance is analyzed.