Academic Journal
New results on the robust stability of control systems with a generalized disturbance observer
| Title: | New results on the robust stability of control systems with a generalized disturbance observer |
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| Authors: | Zhuo‐Yun Nie, Qing‐Guo Wang, Jinhua She, Rui‐Juan Liu, Dong‐Sheng Guo |
| Source: | Asian Journal of Control. 22:2463-2475 |
| Publisher Information: | Wiley, 2019. |
| Publication Year: | 2019 |
| Subject Terms: | 0209 industrial biotechnology, Adaptive or robust stabilization, Perturbations in control/observation systems, disturbance rejection, robust stability, 02 engineering and technology, generalized disturbance observer (GDOB), non-minimum-phase system, Frequency-response methods in control theory |
| Description: | A generalized disturbance observer‐based (GDOB) control system and its robust stability are studied in this paper. One feature of this new GDOB scheme is that an inverse of the nominal plant in the standard DOB is no longer required. Thus, it is applicable to both minimum‐phase (MP) and non‐minimum‐phase (NMP) plants. New conditions for robust stability are derived for two cases: plants with no right half plane (RHP) zero and plants with no RHP pole, which are in a perfect dual form. The duality reveals that the robust stability for a plant with RHP zeros is met when the Q‐filter has a sufficiently large constant. This is fundamentally different from well‐known results for a MP plant. The stability conditions indicate that the robustness against large uncertainties not only can be achieved by a well‐selected Q‐filter, but also by the reduction of mismatch between a compensated plant and a desired model. The obtained stability results provide guidelines for the control system design. This is illustrated by three examples. |
| Document Type: | Article |
| File Description: | application/xml |
| Language: | English |
| ISSN: | 1934-6093 1561-8625 |
| DOI: | 10.1002/asjc.2188 |
| Access URL: | https://zbmath.org/7879354 https://doi.org/10.1002/asjc.2188 https://dl.acm.org/doi/10.1002/asjc.2188 https://onlinelibrary.wiley.com/doi/abs/10.1002/asjc.2188 https://onlinelibrary.wiley.com/doi/epdf/10.1002/asjc.2188 |
| Rights: | Wiley Online Library User Agreement |
| Accession Number: | edsair.doi.dedup.....f16ae2f506118b7f10ef2a0a361d4c3e |
| Database: | OpenAIRE |
| ISSN: | 19346093 15618625 |
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| DOI: | 10.1002/asjc.2188 |