Article ID Journal Published Year Pages File Type
153907 Chemical Engineering Journal 2009 14 Pages PDF
Abstract

This paper proposes an extension of CRONE control and design for unstable, multiple time-delay multivariable plants with right half-plane (RHP) zeros. The CRONE control approach developed for multivariable square plants is based on third generation scalar CRONE methodology. The aim is to find a decoupling and stabilizing controller for the open-loop transfer matrix. Fractional order transfer functions are used to define all the components of the diagonal open-loop transfer matrix, β0i. Optimization gives the best fractional open-loop transfer matrix, β. Finally, frequency-domain system identification is used to find a robust controller K = G−1β. When the plant is inversed, time-delays and RHP poles or zeros can appear on the denominator of the transfer matrix, G−1. To achieve a stable controller some time-delays, RHP zeros and unstable poles must be included within the diagonal transfer function of the open-loop transfer matrix. To assess the proposed design, the CRONE control approach is applied to a distillation example.

Related Topics
Physical Sciences and Engineering Chemical Engineering Chemical Engineering (General)
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