Anti-time lag flase-proportional integral control system and method

Abstract

The invention relates to an anti-time pseudo-blocking proportional-integral control system and a method thereof. The system comprises a humidity controller and a moisture controller which are connected as a loop. A temperature control circular loop is introduced into a loop of a temperature controller and the humidity controller, therefore the whole system forms a feedback compensation loop. The invention provides the anti-time pseudo-blocking proportional-integral control system and the method thereof introduced on the basis of compensating time delay by the controllers, which is provided with the sections of an integration variable PI function and an anticipation function. Compared with the conventional control method, an anti-time pseudo-blocking PI controller has simpler design and easily adjustable parameters.

Description

technical field [0001] The invention belongs to the field of industrial control, and in particular relates to a time-delay-resistant pseudo-proportional-integral control system and method used in the shredded tobacco drying process of a cigarette factory. Background technique [0002] Time-delay integral processes are often encountered in industrial processes, and some first-order processes with relatively large time constants are also regarded as integral systems. Research on time-delay-integral processes has been carried out, and many control algorithms have been proposed. This type of process is easily affected by time lag in terms of system performance and stability, and it is difficult to obtain satisfactory control results. In recent years, many scholars have done a lot of research work on this, and have achieved rich results. [0003] For the integral plus pure lag system, when the Smith predictor is used to control the process, the control performance is seriously ...

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Problems solved by technology

[0003] For the integral plus pure lag system, when the Smith predictor is used to control the process, the control performance is seriously affected by the model mismatch, and when the input disturbance exists, the system output has a residual error

Some literatures have proposed various control algorithms for this type of system, but these algorithms more or less have the following problems: 1) The design of the controller is complicated, and it is difficult to implement on site; 2) The tuning of the controller is cumbersome, and the parameters No intuitive physical meaning; 3) Very sensitive to model mismatch and poor robustness; 4) Controller output oscillation is serious

However, in the case of model mismatch, this kind of controller is easy to cause oscillation and even instability.

Chien and Peng et al. proposed a new type of Smith predictive controller that passes the set value through the PI link. This controller has better dynamic performance and anti-interference ability when the model is matched and the model is mismatched. The only The defect is that when the model is mismatched, the controller output oscillates, which is not conducive to practical engineering applications

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