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Digital redesign of cascaded analogue controllers for sampled-data interval systems

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3 Author(s)
Shieh, L.S. ; Dept. of Electr. & Comput. Eng., Houston Univ., TX, USA ; Wang, W.M. ; Sunkel, J.W.

The paper presents a new method for the digital redesign of cascaded analogue controllers for continuous-time parametric interval systems. The bilinear and inverse-bilinear approximation method is developed to carry out discretisation of the predesigned cascaded analogue controller, taking into account intersample behaviour and implementation errors. A dual concept of the proposed digital redesign method is utilised to construct a new pseudodigital observer such that the estimated states of the digitally redesigned digital observer closely match those of the original continuous-time observer at the sampling instants. Using the newly digitally redesigned observer based controllers, the resulting dynamic states of the digitally controlled cascaded sampled-data interval systems are able to closely match those of the original analogously controlled cascaded continuous-time parametric interval systems

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Control Theory and Applications, IEE Proceedings -  (Volume:143 ,  Issue: 6 )