Simple and robust two-degree-of-freedom proportional-integral control method

Abstract

The invention relates to a concise and robust two-degree-of-freedom proportion integral control method. The method comprises the following steps: firstly selecting the set value weighting coefficient b and the sampling time; on the basis of identifying the object model in the industrial control system, estimating the modeling error value according to the change of the actual working condition of the object; determining the adjustable parameter [lambda] value by the size of the modeling error; and calling a previously prepared two-degree-of-freedom PI control program to calculate the control output signal. Compared with the prior art, the method has the advantages that the system obtains superior servo performance and adjustment performance at the same time.

Description

technical field [0001] The present invention relates to the technical field of industrial process control, in particular to a simple and robust two-degree-of-freedom (2-DoF) proportional-integral (PI) control method. For industrial process control objects, a two-degree-of-freedom proportional-integral control structure is adopted to achieve a simple Modulo PI control is the principle, using the maximum sensitivity peak index (M s ) to set the adjustable parameters. Background technique [0002] In the field of industrial process control, PID control has been well known by the majority of engineers and technicians. At present, the application of PID control still occupies a dominant position, because it not only has the advantages of simple structure, strong robustness and convenient application, but also can meet most industrial control requirements. [0003] The key to the successful application of PID control technology lies in the tuning of controller parameters. Common...

AI Technical Summary

Problems solved by technology

[0005] However, one disadvantage of the above method is that the controller structure is one degree of freedom, that is, the setpoint response and the disturbance response of the closed-loop system are coupled, and the optimal servo performance and regulation performance cannot be obtained at the same time.

The invention patent "Practical PID Controller with Two Degrees of Freedom" (application number 92109857.X) proposes a practical PID control method with two degrees of freedom, which can achieve the best tracking performance and the best anti-interference characteristics at the same time, but the The method contains as many as three two-degree-of-freedom coefficients (α, β, and γ), which is not convenient for tuning and engineering applications, and the author did not consider the discrete domain programming of the controller. In fact, most of the control objects are controlled by computers. way to control

Images