Adaptive Extension Controller Design
for NonlinearSystems
WongChingchang1,ChenJenyang2
(1.
Department
of Electrical Engineering,Tamkang University,Tamsui,TaipeiHsien,Taiwan,China;2.Department of
Electronic Engineering,China Institute
of Technology,Taipei,Taiwan,China)
[Abstract] A design
method for the
extension controller is
developed in this
paper.The proposed
adaptive extension control
resulting from the
direct adaptive approach
is employed to
directly adapt the
gain parameter of
the extension controller.Then the
constructed controller can
be best approximated
to a given
optimal control.Unlike the
fuzzy controller,onlyonelinguistic-like level
is needed in
the extension controller.The merits
of the proposed
controller are that(a)the number
of adaptation parameter
issmall;(b)the design
algorithm is easily
to be implemented.In addition,a maximum
control is established
to guarantee the
system robust stability.The derivation
shows that the
proposed extension controller
is stable in
the sense of
the Lyapunov.Finally,a nonlin earsystem
simulation example is
applied to verifying
the effectiveness and
the ability of
the proposed adaptive
extension controller.
[Keywords] extension theory;adaptive control;extension controller;robust stability