Recent Developments in Digital Control Theory

Abstract Recent, reasearches on application of nonconventional digital controllers are surveyed, Here, nonconventional digital controllers mean digital controllers equipped with general hold circuits, general samplers or periodically time-varying discribe-time compensators, and include multirate digital controllers as a spcial case, First, their basic features ane studied. Then, their advantages pitfalls, and limitation are explained. After that, the problem: “when and how to use nonconventional digital controllers?” is considered. The scope is limited to the control problems of time-invariant continuous-time plants, emphasis is placedon explaining the basic aspects of reasearches and clarifying their interrelations.

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