Catálogo de publicaciones - libros

Cascade control and ratio control schemes based on PID controllers have been addressed in this chapter. It has been shown that the adoption of recent design methodologies and modifications of the classic control architectures can lead to a faster commissioning of the overall control system and to a significant improvement in the control performance, although the general know-how and the simplicity of use of the basic PID control algorithm is retained.

In this chapter different Plug&Control strategies have been presented. It has been shown how this approach is very promising since, provided that the methodology is applied in a suitable context, it is capable of providing a fast and effective design of the control loop. Obviously, this feature is more relevant in large plants, when there are many (simple) loops to tune.

It is believed that in the future new techniques in this framework can be devised since there is much room for the improvement of the performance, especially for high-order processes.

In this chapter the integrator windup effect in the context of PID controllers has been analysed and different anti-windup techniques have been presented and compared.

Actually, all the considered methods are effective and each one has particular features that should be taken into account in a given application (indeed, there is not a technique that performs better than the others for all the kind of processes, PID parameters and actuator limits). From one point of view, the conditional integration approach has the advantage of being without an additional tuning parameter, but, from another point of view, the back-calculation methodology provides the capability to influence the transient response through the tuning of the tracking time constant (namely, a less aggressive response can be imposed by lowering the value of ). The combined approach seems to be less sensitive to the characteristics of the process. The two techniques considered for the PI(D) controller in automatic reset configuration do not show particular differences. With respect to them, a significant improvement in the performance does not actually emerges by applying the VSPID or the preload technique, despite they present a tuning parameter.

In this chapter the role of the set-point weighting in the PID control law has been underlined and it has been shown how it can be effectively adopted in order to decouple the problem of providing good performance at the same time both in the set-point following and in the load disturbance rejection task. For processes with small normalised dead time, the adoption of a time varying (control error dependent) set-point weight can represent a valid choice to avoid a large overshoot without increasing the rise time. In this context, two methodologies, namely the variable set-point weighting and the fuzzy set-point weighting technique, have been thoroughly analysed in order to provide a clear characterisation of them and to understand their applicability in practical situations. It has been shown that the use of such techniques indeed represents a valuable solution for the implementation of a high-performance controller by retaining at the same time the overall ease of use of a PID controller.

In this chapter different Plug&Control strategies have been presented. It has been shown how this approach is very promising since, provided that the methodology is applied in a suitable context, it is capable of providing a fast and effective design of the control loop. Obviously, this feature is more relevant in large plants, when there are many (simple) loops to tune.

It is believed that in the future new techniques in this framework can be devised since there is much room for the improvement of the performance, especially for high-order processes.

In this chapter different Plug&Control strategies have been presented. It has been shown how this approach is very promising since, provided that the methodology is applied in a suitable context, it is capable of providing a fast and effective design of the control loop. Obviously, this feature is more relevant in large plants, when there are many (simple) loops to tune.

It is believed that in the future new techniques in this framework can be devised since there is much room for the improvement of the performance, especially for high-order processes.

In this chapter different Plug&Control strategies have been presented. It has been shown how this approach is very promising since, provided that the methodology is applied in a suitable context, it is capable of providing a fast and effective design of the control loop. Obviously, this feature is more relevant in large plants, when there are many (simple) loops to tune.

It is believed that in the future new techniques in this framework can be devised since there is much room for the improvement of the performance, especially for high-order processes.

In this chapter different Plug&Control strategies have been presented. It has been shown how this approach is very promising since, provided that the methodology is applied in a suitable context, it is capable of providing a fast and effective design of the control loop. Obviously, this feature is more relevant in large plants, when there are many (simple) loops to tune.

It is believed that in the future new techniques in this framework can be devised since there is much room for the improvement of the performance, especially for high-order processes.

Cascade control and ratio control schemes based on PID controllers have been addressed in this chapter. It has been shown that the adoption of recent design methodologies and modifications of the classic control architectures can lead to a faster commissioning of the overall control system and to a significant improvement in the control performance, although the general know-how and the simplicity of use of the basic PID control algorithm is retained.