Controller monitoring constitutes an integral part of performance improvement. An ideal control system should be able to monitor the robustness (or performance) of a closed-loop system. The concept of an expert control system of Årzén (1989), Åström et al. (1986), Doraiswami and Jiang (1989), and Ortega et al. (1992) offers some light in achieving this goal. The performance measure in an expert control system generally is based on the errors in the controlled variable (e.g., integrated absolute error or integrated square error), a time domain technique. However, for the regulatory oriented process control systems, this means we are not able to assess the robustness (or performance) of a control system until a disturbance comes into the system. A better measure should be able to tell the robustness of a closed-loop system before the disturbance comes into the system (or significant deviations in the controlled variable are observed).
KeywordsDistillation Column Linear Assumption Monitoring Procedure Multivariable System Hysteresis Width
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