Disturbance Observer Based Performance Improvement of H∞ Controller

Disturbance observer proposed in this paper estimates the equivalent input disturbance and modifies control law to reject it. A reduced order observer is used to estimate disturbance from the input-output measurement when subject to large disturbance. Convergence of disturbance estimator is decided...

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Bibliographic Details
Published in2008 IEEE Region 10 and the Third international Conference on Industrial and Information Systems pp. 1 - 6
Main Authors Kishore, W.C.A., Sen, S., Ray, G.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.12.2008
Subjects
Control systems
Disturbance Observer
Disturbance Rejection Control
H ∞ Control
Linear matrix inequalities
Linear Matrix Inequality (LMI)
Motion control
Observers
Optimal control
Robust control
Satellite Launch Vehicle (SLV)
Satellites
Sliding mode control
Stability
Vehicles
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Summary:Disturbance observer proposed in this paper estimates the equivalent input disturbance and modifies control law to reject it. A reduced order observer is used to estimate disturbance from the input-output measurement when subject to large disturbance. Convergence of disturbance estimator is decided by the observer gain, which is selected through sufficient condition for stability. Simulation studies carried out on a satellite launch vehicle model has shown significant improvement on the response. The proposed controller has also shown enhanced disturbance rejection, when analyzed through frequency response of disturbance transfer function.
ISSN:2164-7011
2690-3423
DOI:10.1109/ICIINFS.2008.4798384