【摘 要】
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This paper presents a parameter formula connecting the well-known proportional-integral-derivative (PID) control and the active disturbance rejection control (A
【机 构】
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Key Laboratory of Systems and Control, Academy of Mathematics and Systems Science,Chinese Academy of
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This paper presents a parameter formula connecting the well-known proportional-integral-derivative (PID) control and the active disturbance rejection control (ADRC).On the one hand,this formula gives a quantitative lower bound to the bandwidth of the extended state observer (ESO) used in ADRC,implying that the ESO is not necessarily of high gain.On the other hand,enlightened by the design of ADRC,a new PID tuning rule is provided,which can guarantee both strong robustness and nice tracking performance of the closed-loop systems under the PID control.Moreover,it is proved that the ESO can be rewritten as a suitable linear combination of the three terms in PID,which can give a better estimate for the system uncertainty than the single integral term in the PID controller.Theoretical results are verified also by simulations in the paper.
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