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Quasi-PI prediction control new method for time delay system

A time-delay system and predictive control technology, applied to controllers with specific characteristics, electric controllers, etc., can solve the problems of time-delay system sensitive control performance, small margin of stability domain, slow response speed, etc., and achieve real-time performance Good, strong anti-disturbance ability, fast response effect

Active Publication Date: 2018-09-07
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the stability domain margin obtained by this method is very small, and it is very sensitive to the control performance of the time-delay system, and a small change in the stability domain (such as 0.005) may cause system instability
In addition, the response speed of this method is very slow, for the dead time τ=60 s The controlled object takes about 6000 seconds to enter a stable state

Method used

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  • Quasi-PI prediction control new method for time delay system
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  • Quasi-PI prediction control new method for time delay system

Examples

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Effect test

example 1

[0084] Example 1. When the Smith predictor model parameters are 20% larger than the model parameters of the time-delay object, that is: a m =1.2a,b m =1.2b, τ m =1.2τ, the simulation results are as follows image 3 . Depend on image 3 It can be seen that using the quasi-PI predictive control method proposed by the present invention to apply control to the time-delay system (22), not only the response speed is fast (about 200 seconds to enter the steady state), the overshoot is very small, and the control accuracy is high (about 300 seconds After that, it can enter the precise control state), and it also has a strong anti-disturbance ability.

example 2

[0085] Example 2.Smith predictor model parameter a m and b m Same as example 1, ie b m =1.2b, a m = 1.2a, and the lag time estimated value τ m Then use the estimation method of 2(3) to determine, the simulation results are as follows Figure 4 shown. and image 3 compared to, Figure 4 The control results have obvious advantages.

[0086] 4 Conclusion

[0087]The "new quasi-PI predictive control method for time-delay systems" proposed by the present invention, its main idea is: use the Smith predictor to compensate the feedback information in advance, so as to effectively solve the difficult problem that the time-delay system lacks effective information feedback within the time-delay, and A quasi-PI predictive controller is designed. Theoretical analysis shows that the quasi-PI predictive controller proposed by the present invention not only has global asymptotically stable performance, but also has strong anti-disturbance ability, and is a kind of strong anti-disturb...

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Abstract

The invention provides a quasi-PI prediction control method independent of model and properties of a controlled object specific to the control problem of the time delay system. A reason why a time delay system is difficult to control lies in that information feedback is not in time, and a controller based on feedback information is helpless to the time delay system. The 'quasi-PI prediction control new method for a time delay system' uses a Smith predictor to realize advanced compensation of information f the time delay system according to characteristics of the time delay system and controlsa time delay object by using a quasi-PI control method. The quasi-PI control method only has one gain parameter, a closed-loop control system can be guaranteed to be globally asymptotic and stable, and controller gain also has great setting margin. A numerical simulation experiment shows that the quasi-PI prediction control method is not only high in response speed and control accuracy but also has strong anti-disturbance capability, thereby being an effective control method and having an extensive application value in the field of time delay system control.

Description

technical field [0001] Time-delay systems, process control. 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. Because of the existence of the time lag phenomenon, the control quantity of the system cannot respond to the dynamic changes of the system in a timely manner, which leads to the undesirable phenomena of large overshoot and long response time in the entire system, and even oscillation or instability. It brings great challenges to the design of time-delay system controllers. Therefore, solving the time-delay system control problem is of great significance to the precise tracking of the target trajectory and the stability of the system. For the control problems of time-delay systems, PID control and ADRC control have been the mainstream control me...

Claims

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Application Information

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IPC IPC(8): G05B11/42
CPCG05B11/42
Inventor 曾喆昭
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY