On the enhanced ADRC design with a low observer bandwidth

In this paper, the extended state observer (ESO) is brought into the frequency domain to show to what degree it forces the plant to behave like cascaded integrators and what can be done to improve the performance when the ESO is bandwidth limited. In particular, a root locus technique is used to sho...

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Bibliographic Details
Main Authors: Tatsumi, Jason, Zhiqiang Gao
Format: Conference Proceeding
Language:English
Subjects:
Active disturbance rejection control
Bandwidth
extended state observer
Frequency control
Frequency response
loop-shaping
Noise
observer bandwidth
Observers
Poles and zeros
root locus
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Summary:In this paper, the extended state observer (ESO) is brought into the frequency domain to show to what degree it forces the plant to behave like cascaded integrators and what can be done to improve the performance when the ESO is bandwidth limited. In particular, a root locus technique is used to show how the poles of the modified plant change as the ESO bandwidth increases. Based on the insight obtained, three correction techniques are explored to improve the system performance for those applications with a low ESO bandwidth. With these proposed techniques, the closed-loop system bandwidth is no longer as severely constrained by the ESO bandwidth as in the original ADRC.
ISSN:2161-2927