Abstract
This paper discusses the design of observer-based reduced order controllers for the stabilization of large
scale linear discrete-time control systems. This design is carried out via deriving a reduced-order model
for the given linear plant using the dominant state of the linear plant. Using this reduced-order linear
model, sufficient conditions are derived for the design of observer-based reduced order controllers. A
separation principle has been established in this paper which demonstrates that the observer poles and
controller poles can be separated and hence the pole-placement problem and observer design are
independent of each other.
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