Robust Digital Control Design
One of the basic questions in control design is how to account for the discrepancies between the model of the plant used for design and the true model. A number of factors may be responsible for modelling errors. A generic term for this modelling error is model uncertainty which can itself be represented mathematically in different ways. Two major classes of uncertainty are: structured uncertainty (or more commonly termed parametric uncertainty) and unstructured uncertainty (usually specified in the frequency domain). The use of unstructured uncertainty description was one of the starting points for the impressive development of robust control design in the 80’s (Zames 1981).
KeywordsClose Loop System Nyquist Plot Robust Stability Internal Model Control Nyquist Criterion
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