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ADRC based input disturbance rejection for minimum-phase plants with unknown orders and/or uncertain relative degrees

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Abstract

The capability of ADRC is studied for linear time-invariant SISO minimum-phase systems with unknown orders, uncertain relative degrees, and unknown input disturbances. It is proved that ADRC can reject the unknown input disturbance and guarantee the close-loop stability for the plants with unknown but bounded relative degrees. Meanwhile, some close-loop performances can be achieved. The influence of the sensor noise is also discussed. And it is demonstrated by numerical examples that one ADRC with fixed parameters can be applied to a group of plants of different orders, relative degrees, and parameters.

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Correspondence to Chunzhe Zhao.

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This research was supported by Natural Science Foundation of China under Grant Nos. 60821091 and 60736022.

This paper was recommended for publication by Editor Yiguang HONG.

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Zhao, C., Huang, Y. ADRC based input disturbance rejection for minimum-phase plants with unknown orders and/or uncertain relative degrees. J Syst Sci Complex 25, 625–640 (2012). https://doi.org/10.1007/s11424-012-1022-4

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  • DOI: https://doi.org/10.1007/s11424-012-1022-4

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