Novel method of Smith self-coupling PI cooperative control theory of time delay system

A time-delay system and cooperative control technology, which is applied to controllers with specific characteristics, electric controllers, etc., can solve the problems of time-delay time sensitivity, difficulty, and difficulty in grasping, and achieve the effect of good anti-disturbance robustness.

Inactive Publication Date: 2020-02-21
曾喆昭
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the speed factor of the intelligent PI compound control method is set by the integral step, which is difficult to grasp in practical applications; the speed factor of the damping intelligent PI control method and the predictive intelligent PI control method are jo

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  • Novel method of Smith self-coupling PI cooperative control theory of time delay system
  • Novel method of Smith self-coupling PI cooperative control theory of time delay system
  • Novel method of Smith self-coupling PI cooperative control theory of time delay system

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Embodiment Construction

[0035] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings and examples.

[0036] 1. Smith predictive compensation model for time-delay systems

[0037] 1) Problem description

[0038] In the industrial production process, the first-order plus pure lag model is often used to simulate the large time-delay process in the production process, and its transfer function can be expressed as

[0039]

[0040] Among them, T is the system time constant, τ is the delay time, and K is the system gain.

[0041] The corresponding differential equation of the time-delay system (1) is

[0042]

[0043] Among them, a=1 / T, b=K / T, u is the control input, y 1 is the internal state of the time-delay system, y p is the actual output of the time-delay system.

[0044] Let the desired output be y d , according to the characteristics of the time-delay system, when t1 =y d -y p =y d has been in the m...

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Abstract

A large time delay process is difficult to control, and the fundamental reason is that information feedback is not timely, so a controller based on feedback information is powerless for the system. Aiming at the control problem of a large time delay system, the invention provides a novel method of the Smith auto-coupling PI (SACPI) cooperative control theory independent of a controlled object model. According to the invention, the method comprise the steps: on the basis of an early invention, constructing a Smith nominal predictor according to nominal parameters of a time delay object, and setting a speed factor according to a nominal time constant and nominal time delay. Theoretically, the SACPI control system is not only globally asymptotically stable, but also has good parameter perturbation robustness. Numerical simulation results show that under the condition that various model parameters have time-varying perturbation, the control method can obtain good dynamic quality and steady-state performance, and therefore, the method is an effective control method and has a high application value in the field of time-delay system control.

Description

technical field [0001] The invention relates to a control method of a time-delay system, in particular to a new method of Smith Auto-Coupling Proportional-Integral (Smith Auto-Coupling Proportional-Integral, SACPI) cooperative control theory. Background technique [0002] Time lag widely exists in industrial processes such as petroleum, chemical industry, power grid, nuclear reactor, and wastewater treatment. These industrial processes can often be simplified as one or more first-order plus-purity lag systems. Due to the existence of the time lag phenomenon, the system has been in invalid output during the time lag period (assuming that the invalid output is y=0), therefore, during the time lag period, the tracking error e 1 =y d -y=y d Always at the maximum value, it is easy to cause large overshoot, long response time, and even oscillation or instability of the entire system due to integral saturation, which brings great challenges to the design of time-delay system con...

Claims

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Application Information

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IPC IPC(8): G05B11/42
CPCG05B11/42
Inventor 曾喆昭
Owner 曾喆昭
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