Abstract
In this paper, we study the robust stability of closed-loop system with noise reduction-disturbance observer (NR-DOB) when the relative degree of plant is greater than that of nominal model. Compared with the case where the relative degree of plant is the same as that of nominal model, it is shown that the nominal model for NR-DOB controller should be carefully chosen in order to achieve the robust stability. Computer simulation results to confirm the proposed condition are also included.
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