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A technique for optimal digital redesign of analog controllers

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3 Author(s)
Rafee, N. ; Dept. of Electr. & Comput. Eng., Calgary Univ., Alta., Canada ; Tongwen Chen ; Malik, O.P.

Digital control design is often accomplished by discretizing existing analog controllers. For this purpose, a new digital redesign technique is presented in this paper. It is based on optimal matching of the continuous-time closed-loop step responses of both the analog and discretized systems. The optimization problem is solved by application of the recent sampled-data control theory. The proposed technique is applied to discretization of a conventional power system stabilizer for a single-machine power system and the simulation results show that the new optimal digital redesign technique outperforms the conventional discretization methods

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Control Systems Technology, IEEE Transactions on  (Volume:5 ,  Issue: 1 )