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On the order of simultaneously stabilizing compensators

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1 Author(s)
Toker, O. ; Eindhoven Univ. of Technol., Netherlands

In this paper, simultaneous strong stabilization problem is considered, and it is shown that there is no upper bound for the minimal order of a simultaneously strongly stabilizing compensator, in terms of the plant orders. A similar problem was also considered by Smith et al. (1986), where it was shown that such a bound does not exist for the strong stabilization problem of a single plant. But the examples given in the article were forcing an approximate unstable pole-zero cancellation or forcing the distance between two distinct unstable zeros to go to zero. In this paper it is shown that: 1) if approximate unstable pole-zero cancellation does not occur, and the distances between distinct unstable zeros are bounded below by a positive constant, then it is possible to find an upper bound for the minimal order of a strongly stabilizing compensator, and 2) for the simultaneous strong stabilization problem (even for the two plant case), such a bound cannot be found

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Automatic Control, IEEE Transactions on  (Volume:41 ,  Issue: 3 )