Anti-saturation internal model control system design method based on static-state feedforward compensation

Abstract

The invention provides an anti-saturation internal model control system design method based on static-state feedforward compensation. The method is used for a process industrial control system. The method comprises a controller Q, a to-be-controlled object GP containing saturation elements, an internal model Gm of the to-be-controlled object and three static-state compensators K1, K2 and K3. By performing static feedforward analysis on the basis of original internal model control system, compensation is performed for controller input bias, controller output bias, which are caused by saturation phenomena, and controller output bias caused by slowing down of output of the object. By leading in 3 compensation loops in the original internal model control system output response of the object is improved. Compared with the prior art, according to the invention, controller and compensator design is performed based on transfer function of the object, so an engineer can know the method more easily. Meanwhile, the method, which improves the output response of the object via the static feedforward compensation idea, is different from the traditional anti-saturation internal model control idea, so the method is highly realizable in actual application.

Description

technical field [0001] The invention relates to a design method of an anti-saturation internal model control system based on static feedforward compensation, including an anti-saturation internal model control system structure and a design method of a compensator, and is mainly used in the field of control engineering. Background technique [0002] In actual industrial control, the phenomenon of input saturation is ubiquitous. For example, the maximum flow rate of a pipeline with a valve can only reach the flow value at which the valve opening is 100%, which cannot be broken through; for another example, the maximum flow rate that the pump can output can only reach the flow value at the maximum pump speed, which cannot Unlimited additions. Various practical cases show that input saturation is common in industry. [0003] However, the input saturation phenomenon has a non-negligible influence on the control effect of the control system. This is because the existence of the...

AI Technical Summary

Problems solved by technology

[0006] However, existing anti-saturation control techniques still have some shortcomings

First of all, the AWBT anti-saturation control strategy based on linear matrix inequality is mainly based on the state space model, which is difficult for engineers to understand

Secondly, the above method needs to establish a linear matrix inequality, the process is complicated, and to ensure the ideal control effect, an accurate controlled object model is required

Thirdly, Wang Jingcheng and others manually adjusted the design of the compensator, and it was difficult to ensure that the output of the object was optimal.

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