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An improved closed-loop stability related measure for finite-precision digital controller realizations

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5 Author(s)
Wu, J. ; Nat. Lab. of Ind. Control Technol., Zhejiang Univ., Hangzhou, China ; Chen, S. ; Li, G. ; Istepanian, R.H.
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The pole-sensitivity approach is employed to investigate the stability issue of the discrete-time control system, where a digital controller implemented with finite word length (FWL), is used. A stability related measure is derived, which is more accurate in estimating the closed-loop stability robustness of an FWL implemented controller than some existing measures for the pole-sensitivity analysis. This improved stability measure thus provides a better criterion to find the optimal realizations for a generic controller structure that includes output-feedback and observer-based controllers. A numerical example is used to verify the theoretical analysis and to illustrate the design procedure

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Automatic Control, IEEE Transactions on  (Volume:46 ,  Issue: 7 )