Predictive active disturbance rejection control strategy for finite time convergence of compression type refrigeration system

Abstract

The invention relates to a prediction active disturbance rejection control strategy for finite time convergence of a compression type refrigerating system, which comprises the following steps: establishing a mathematical model of the compression type refrigerating system; decoupling the model of the compression type refrigeration system into two independent control loops; constructing a Smith predictor, and feeding back by using the prediction output of the Smith predictor; constructing a nonlinear extended state observer with finite time convergence; and constructing an active disturbance rejection controller to realize the function of predicting active disturbance rejection control. Aiming at the characteristics of big time lag, strong coupling, multivariable, time variation and the likeof the compression type refrigeration system, the Smith predictor is combined with the active disturbance rejection control with finite time convergence, a prediction active disturbance rejection control strategy with finite time convergence is realized, the unmodeled dynamics, uncertain items, dynamic coupling and external disturbance of the refrigeration system can be estimated and compensatedas total disturbance, and the stability of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of refrigeration system control, in particular to a predictive active disturbance rejection control strategy for finite time convergence of a compression refrigeration system. Background technique [0002] In recent years, with the in-depth development of industrialization, a large amount of energy has been gradually consumed, leading to the gradual deepening of the global energy crisis. Energy loss has become a global problem that needs to be solved urgently, and energy saving and consumption reduction are imperative. At present, building energy consumption accounts for more than 40% of the global primary energy consumption, and more than 60% of building energy is used for air conditioning services. At the same time, computer control technology has also developed rapidly, and more and more control methods have been applied to refrigeration systems. [0003] In traditional industrial control, PID feedback c...

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Problems solved by technology

Smith predictive control can effectively compensate the time delay of the system, but its application range is limited due to the high accuracy requirements of the process model and poor robustness

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