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Linear-quadratic problem for a time-invariant scalar continuous time system and a bound spectrum disturbance is considered. The problem is shown to be degenerate; and an algorithm of the regulator synthesis is presented.
Modern industrial plants consist of many processes occurring simultaneously which are to be monitored and controlled at all time, during plant operation. Typically, industrial plants are multi-input multi-output type and they also exhibit strong non-linear dynamics. Three tank liquid level control is such a laboratory based benchmark multi-variable control problem for modeling, identification, fault...
This paper proposes a three-phase methodology to PID auto tuning in commercial digital regulators. The methodology is composed of three distinct steps. A pre-tuning phase is intended to tune a temporal PID, which is able to stabilise the process. A relay auto-tuning phase improves it according to the frequency characteristic of the process, giving an optimal setting on the ISTE criterion sense. The...
With the advance of digital control hardware the simple but effective proportional-integral-derivative (PID) control technology is moving towards a higher level of performance and robustness. A more general class of variable structure (VS) PID has derived from original PIDs to improve their performances and capabilities. This paper revises the main properties of VS regulators and proposes a novel...
Among the performance degradation effects that occur with finite precision implementations of controllers, a seldom addressed one is static imprecision. This paper proposes a multirate realization of a PI controller, relying on the frequency separation between the integral action and the remaining controller dynamics, that improves static precision, while minimally affecting dynamic performance. Suitable...
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