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Unified {maths\cr H}_\infty Control to Suppress Vertices of Plant Input and Output Sensitivity Functions

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1 Author(s)
Sang Min Suh ; Storage Syst. Div., Samsung Electron., Suwon, South Korea

This note presents a discrete-time H controller to attenuate effects of external disturbances introduced from both plant input and plant output. In this note, two stage control structure is constructed so that state variable dependent conventional controllers and H loop shaping controllers are simultaneously utilized, which is a different approach from previous methods. For the loop shaping controller, a new weighting function derived from an open loop transfer function of fictitious state-feedback systems is proposed. Since the weighting function inherits implicit stability margins, sufficiently stable closed loop systems are designed, therefore well damped transient responses are achieved.

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Control Systems Technology, IEEE Transactions on  (Volume:18 ,  Issue: 4 )