A cascade control method, device, equipment and storage medium

Abstract

The embodiments of the present application disclose a cascade control method, device and device, wherein the method includes: standardizing a first process output, inputting the standardized first process output and process given amount into a subtraction link, and outputting the subtraction link The process deviation output is sent to the positive feedback link; the process deviation output enters the positive feedback link, and the positive feedback link outputs the positive feedback output to the proportional link according to the process deviation output; the positive feedback output is input into the proportional link, and the proportional link is based on the positive feedback output. The feedback output quantity outputs the control output quantity to the process object link and the control output quantity is input to the process object link; the process object link outputs the second process output quantity according to the control output quantity, and makes the second process output quantity the first process output quantity, and the The first process output is input to the subtraction link. The cascade control method provided by the embodiment of the present invention has better control quality for difficult-to-control processes.

Description

technical field [0001] The invention relates to the technical field of thermal power plant process control, in particular to a cascade control method, device, equipment and storage medium. Background technique [0002] In the process control of thermal power plants, the large lag process is ubiquitous. The so-called large lag is an abbreviation for the high-order larger inertia and larger pure lag characteristics. It is generally believed that: in a large hysteresis process, when the pure hysteresis ratio is above 40%, the process is a difficult-to-control process. Difficult-to-control processes have always been one of the technical problems plaguing the process control of thermal power plants. [0003] In the industrial control process, the existing Smith predictive controller is a control strategy based on the object mathematical model and pure lag compensation for the process, but the problems existing in the Smith predictive controller make it use Not common. The fund...

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Problems solved by technology

[0003] In the industrial control process, the existing Smith predictive controller is a control strategy based on the object mathematical model and pure lag compensation for the process, but the problems existing in the Smith predictive controller make it use not common

The fundamental reason is that when using the Smith predictive controller, due to the large deviation between theory and practice, in actual control, an accurate model of the process is needed, but the accurate model of the process and the accurate pure lag model of the process are difficult to obtain , which affects the use of the existing Smith predictor controller

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