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This paper concerns with the typical problem of disturbance rejection in process control in the presence of time-delays and, possibly, the integrating or unstable dynamics. It is shown how unknown disturbance can be rejected actively in the absence of detailed mathematical model of the process. Disturbance rejection ability and stability are analyzed using the language of frequency response engineers...
The control of unstable multiple-input multiple-output (MIMO) systems with multiple and different time delays, is a hard problem due to the interactions and the different delays. In this paper, the control is designed based on the availability of the undelayed state of the process. First, a time delay compensator for single-input single-output (SISO) unstable systems is introduced, allowing to get...
A novel active disturbance rejection control (ADRC) solution and a particular tuning method are presented for a class of time delay system (TDS) with uncertainty. First, the complicated process dynamics is modeled as a simple first order plus large time delay (FOPTD) plant, with the difference between the actual dynamics and its model treated as disturbances to be rejected. Then the reduced order...
Proportional-integral (PI) controllers represent huge majority of all controllers applied in practice. Despite their broad use, different alternative solutions have been developed based on reconstruction and compensation of input, or output disturbances. Whereas a compensation of output disturbances reconstructed by a parallel plant model represents a key element of the well known internal model control...
Decoupling multi-input multi-output systems is a simplifying technique to design, implement and tune control systems. If there are also multiple delays, the decoupling is even more interesting although there is always a prize to pay and the resulting controllers can become excessively complex. In this paper a new approach to deal with these situations is presented. The procedure involves extracting...
An active disturbance rejection controller (ADRC) is proposed for decoupling double-loop control system. The ADRC consists of the tracking differentiator, the extended state observer and the nonlinear state error feedback. With this approach, the double-loop system with time delay is treated as two correlated control loops according to the best variable pairs selection, the interactions of two control...
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