Controller Reduction: Concepts and Approaches

@article{Anderson1987ControllerRC,
  title={Controller Reduction: Concepts and Approaches},
  author={Brian D. O. Anderson and Yi Liu},
  journal={1987 American Control Conference},
  year={1987},
  pages={1-9}
}
This paper considers the problem of passing from a linear time-invariant high order controller designed for a linear time-invariant plant (of presumably high order) to a low order approximation of the controller. The approximation problem is often best posed as a frequency weighted L¿ approximation problem. Many different controller representations are possible, giving different performance of the various reduction algorithms. 
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