This paper presents an application of model order reduction technique to unstable waste water treatment plent using optimal Hankel Norm Approximation. For unstable system a decomposition algorithm has been applied to break the unstable system into stable and unstable part. Then reduced order model of the stable part has been obtained through Hankel Norm Approximation and finally the reduced order model of unstable system has been obtained by combining the reduced model of stable part and decomposed unstable part. A numerical procedure of the plant has been carried out to show the effectiveness.
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