Disturbance Observer for Periodically Time-varying Systems – A Dynamic-gain Observer Approach
Date Issued
2012
Date
2012
Author(s)
Chang, Hsuan-Jui
Abstract
In engineering and industrial applications, disturbances acting on a dynamic system present a serious problem to system performance. This thesis will focus on the disturbance estimation for periodically time-varying systems. Lifting technique is first used to transform the periodically time-varying system into a time invariant system. A new disturbance observer is then proposed for the lifted system to simultaneously estimate both the system state and external disturbances. A unique feature of the new disturbance observer is that there exists a analogy between the proposed disturbance observer design problem and the disturbance rejection control design problem. As a result, the proposed disturbance observer can be designed in the frequency domain using standard H_infinity control design techniques. Another advantage of the proposed disturbance observer is that it can be applied to both
minimum-phase and non-minimum-phase systems.
Subjects
disturbance observer
periodically time-varying systems
lifting technique
H_infinity frequency shaping control
non-minimum-phase systems
Type
thesis
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