Design of active disturbance rejection internal model control strategy for SISO system with time delay process

Abstract

A novel control scheme of active disturbance rejection internal model control (ADRIMC) is proposed to improve the anti-interference ability and robustness for the dead-time process. The active anti-interference concept is introduced into the internal model control (IMC) by analyzing the relationship between IMC and disturbance observer control (DOB). Further, a design process of disturbance filter is presented to realize the active anti-interference ability for ADRIMC scheme. The disturbance filter is used to estimate an equivalent disturbance consisting of both external disturbances and internal disturbances caused by model mismatches. Simulation results demonstrate that the proposed method possesses a good disturbance rejection performance, though losing some partial dynamic performance. In other words, the proposed method shows a tradeoff between the dynamic performance and the system robust.

Keywords

internal model control (IMC) / disturbance observer (DOB) / active disturbance rejection internal model controller (ADRIMC) / low pass filter (LPF) / robustness

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