Minimum-Variance Assessment of Multivariable Control Systems

Since the loops in multivariable control systems can be coupled, a multivariable control strategy can further reduce process variations, thus, only multivariable assessment can provide the right measure of performance improvement potential in the general case. In this chapter, methods for multivariable minimum-variance benchmarking are presented: it is shown how to use the interactor matrix to derive the multivariable variant of MVC; then the FCOR algorithm as the most known algorithm for assessing MIMO control systems based on routine operating data and the knowledge of the interactor matrix is presented. As the interactor matrix is hard to determine, and thus control assessment based on it is difficult, an assessment procedure that does not require the interactor matrix is proposed. Numerous examples are given to illustrate how the methods work.

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