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Locally optimal-digital redesign of continuous-time systems

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3 Author(s)
L. -S. Shieh ; Dept. of Electr. Eng., Houston Univ., TX, USA ; X. -M. Zhao ; J. -L. Zhang

The authors present a novel optimal digital redesign technique for finding a dynamic digital control law from the given continuous-time counterpart by minimizing a local quadratic performance index. The quadratic performance index is chosen as the integral of the weighted squared difference between the states of the original closed-loop system and those of the digitally controlled open-loop system at any instant between each sampling period. The developed optimal digital redesign control law enables the states of the digitally controlled open-loop system to match closely those of the original closed-loop system at any instant between each sampling period, and it can easily be implemented using microcomputers with a relatively large sampling period. An illustrative example is presented to demonstrated the effectiveness of the proposed method

Published in:

IEEE Transactions on Industrial Electronics  (Volume:36 ,  Issue: 4 )