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Virtual Reference Feedback Tuning for non-minimum phase plants
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DOI：10.1016/j.automatica.2011.04.002.png)
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Abstract
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Model reference control design methods fail when the plant has one or more non-minimum phase zeros that are not included in the reference model, leading possibly to an unstable closed loop. This is a very serious problem for data-based control design methods, where the plant is typically unknown. In this paper, we extend the Virtual Reference Feedback Tuning method to non-minimum phase plants. This extension is based on the idea proposed in Lecchini and Gevers (2002) for Iterative Feedback Tuning. We present a simple two-step procedure that can cope with the situation where the unknown plant may or may not have non-minimum phase zeros. (C) 2011 Elsevier Ltd. All rights reserved.
Keywords:
Model reference control
Data-based control
VRFT
Non-minimum phase systems
Flexible reference model
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