Dictionary of Electrical Engineering

Commonly used terms in the Electrical industry.

robust controller design
a class of design procedures leading to control systems that are robust in the sense of required performance. Robust design is a feedback process involving robustness analysis. A specific technique used in robust controller design depends on the type of model describing a system and its uncertainty, control objective, and a set of admissible controllers. The first requirement is to ensure robust stability; this could be followed by guaranteed cost, disturbance rejection, robust poles localization, target sets or tubes reachability, or other demands.

Ackermann's three basic rules of robust controller design are as follows:

1. Require robustness of control system only for physically motivated parameter values and not with respect to arbitrarily assumed uncertainties of the model.

2. When you close a loop with actuator constraints, leave a slow system slow and leave a fast system fast.

3. Be pessimistic in analysis; then, you can afford to be optimistic in design.
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