Predictor-based time delay sampling system disturbance rejection control method

Abstract

The invention provides a predictor-based time delay sampling system disturbance rejection control method. The method combines a filter Smith predictor and an auto-disturbance rejection control structure. Non-time delay predictive output is predicted through the filter Smith predictor, and the non-time delay predictive output is used for design of an extended state observer. Through configuring thecharacteristic root of the extended state observer and the expected pole of a closed loop control system, an observer and controller gain form is analytically given. The predictor-based time delay sampling system disturbance rejection control method is prominently characterized in that only one adjustable parameter is in the provided observer, the predictive filter and the controller respectively, monotonic increasing or decreasing of the characteristic root of the extended state observer can easily get the trade-off between the robust stability of the closed loop system and the disturbance rejection performance; monotonic increasing or decreasing of the expected pole of the closed loop system can adjust the tracking speed of a system setting point conveniently; and monotonic increasing or decreasing of the parameters of the predictive filter can achieve the trade-off between the disturbance rejection performance and the robust stability of the closed loop system.

Description

technical field [0001] The invention relates to the control system of the chemical production process. Aiming at the open-loop stable, integral and unstable processes with time-delay response in the chemical production, based on ADRC and robust control theory, a novel timeless control system is proposed. The invention discloses an active anti-disturbance control method for hysteresis output prediction, which belongs to the technical field of industrial process control. Background technique [0002] In the actual industrial production process, the time lag phenomenon generally exists in the production process operation and system response, such as material transfer, energy exchange, signal processing, etc. The existence of time lag will lead to the decrease of the stability margin of the system. If the influence of time lag is not considered in the control design, the performance of the closed-loop system will be seriously affected, and may even lead to system instability. T...

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Problems solved by technology

However, the existing active disturbance rejection technology is mainly considered for systems without time delay or considering small time delays as external disturbances

Zheng and Gao of Cleveland State University in the United States proposed the predictor-based active disturbance rejection technology in the document Predictive active disturbance rejection control for processes with time delay (ISA Transactions, 2014, 53(4): 873-881), but only in the open On the control design of ring stabilization system

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