MATLAB CONTROL SYSTEM TOOLBOX 9 Guia do Utilizador Página 254

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7 Control Design Tools
7-6
The estimator poles are the eigenvalues of , which can be arbitrarily
assigned by proper selection of the estimator gain matrix . As a rule of
thumb, the estimator dynamics should be faster than the controller dynamics
(eigenvalues of ).
Replacin g by its estimate in yields the dyna micoutput-feed back
compensator
Note that the resulting closed-loop dynamics are
Hence, you actually assign all closed-loop p oles by independently placing the
eigenv alues of and .
Pole Placement Tools
The Control System Toolbox contains functions to:
Compute gain matrices and that achieve the desired closed-loop pole
locations
Form the state estimator and dynamic compensator using these gains
ξ
·
Aξ Bu L y Cξ Du()++=
ALC
L
ABK
x
ξ
uKx
=
ξ
·
ALC BLD()K
ξLy+=
uKξ=
x
·
e
·
ABK BK
0 ALC
x
e
,= exξ=
ABK
ALC
K
L
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