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I am bit uncertain how I should interpret the definition of an robust controller.

As far I've understood, the closed loop system including the controller has to have a high gain for frequencies where disturbance appears, and decay at frequencies higher than the work area, or noise. Both of these can be determined using a bode plot, thereby determining the robustness of my closed-loop system.

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In its broadest sense, a controller is "robust" when it allows for bounded variations to its parameters – in other words, the controller continues to work as long as its parameters remain within a given bounded range. In the context of Bode work, this translates to high-gain feedback, but it's not necessarily true elsewhere – see for example the H-infinity methods.

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  • $\begingroup$ The variation to take into account for robustness is regarded also with the plant, not only the controller; especially the plant, I would rather say. $\endgroup$ – Ugo Pattacini Dec 28 '14 at 21:58

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