Robustness Improvement by Dynamic State Feedback Stabilization

By: Das, Dushmanta KumarContributor(s): Ghosh, Sandip [Supervisor] | Deparment of Electrical EngineeringMaterial type: TextTextLanguage: English Publisher: 2010Description: 97 pSubject(s): Engineering and Technology | Electrical Engineering | Power ElectronicsOnline resources: Click here to access online Dissertation note: Thesis (M.Tech (R))- National Institute of Technology, Rourkela Summary: A general perception is that dynamic state feedb ack controllers may have superior capabilities compared to the static feedback ones. Although, for nominal systems, such superiority does not exist, it may hold true for systems other than the nominal one . This thesis investigates such capabilities of dynamic state feedback controllers. First, the case of systems with time-invariant uncerta inties is considered. It appears that only a limited number of example systems exist for which dynamic feedback controller ha s superior ability to improve tolerable uncertainty bounds. This thesis shows that not onl y the available ones but there exist a class of systems for which such improvement may occur. This claim has been verified by presenting more numerical examples in the category. Second, this thesis considers the class of systems with feedback delays, more specifically, systems having both input and output delays . The superiority of dynamic feedback controllers for such systems appears to be not investigated so far in literature. Ho wever, it is observed, for the first time, that if one considers a dynamic state feedback c ontroller but with an ar tificial delay in its st ate then the tolerable delay margin improves considerably. The performance of such a controller is investigated thoroughly for scalar systems using a continuous pol e placement technique for delay systems.
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Thesis (Ph.D/M.Tech R) Thesis (Ph.D/M.Tech R) BP Central Library
Thesis Section
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Thesis (M.Tech (R))- National Institute of Technology, Rourkela

A general perception is that dynamic state feedb
ack controllers may have superior capabilities
compared to the static feedback
ones. Although, for nominal systems,
such superiority does not exist,
it may hold true for systems other than the nominal one
. This thesis investigates such capabilities of
dynamic state feedback controllers.
First, the case of systems with time-invariant uncerta
inties is considered. It appears that only a limited
number of example systems exist for which dynamic
feedback controller ha
s superior ability to
improve tolerable uncertainty
bounds. This thesis shows that not onl
y the available ones but there exist
a class of systems for which such improvement may
occur. This claim has been verified by presenting
more numerical examples in the category.
Second, this thesis considers the
class of systems with feedback
delays, more specifically, systems
having both input and output delays
. The superiority of dynamic feedback controllers for such systems
appears to be not investigated so far in literature. Ho
wever, it is observed, for the first time, that if one
considers a dynamic state feedback c
ontroller but with an ar
tificial delay in its st
ate then the tolerable
delay margin improves considerably. The performance
of such a controller is
investigated thoroughly
for scalar systems using a continuous pol
e placement technique for delay systems.

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