| WinPIM-CL
Under Windows |
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Plant
Model Identification in Closed Loop Operation
PURPOSE
Identification of
parametric models for plants operating in closed loop is a
necessity in practice in the following situations:
- the characteristics of the plant do not allow an open loop
identification (ex: plant with integrator behavior, unstable
plant, important drift)
- a controller exists already (ex: PID)
- re-tuning of the controller in order:
. to improve the performances of the closed loop . to assure
the maintenance of the control system.
A major advantage of the identification in closed loop is
the fact that it provides in general a more suitable
"control model" for the design of the controller.
WinPIM-CL is an add-on to the WinPIM identification
software.
GENERAL
DESCRIPTION
WinPIM-CL uses the
prediction error between the output of the closed loop
system and the predicted output generated by predictor of
the closed loop featuring explicitely an adjustable model of
the plant. |
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CLOSED
LOOP IDENTIFICATION TECHNIQUES
WinPIM-CL determines the
best plant model which minimizises the closed loop
prediction error between the true output of the closed loop
system and the predicted one.
3 main classes of identification algorithms are provided:
- closed loop output error identification methods (CLOE
algorithms)
- filtered open loop identification methods (FOL algorithms)
- instrumental variable methods (indirect algorithms). This
method does not require the knowledge of the controller.
VALIDATION OF
THE IDENTIFIED MODELS
The objective of the
validation is to decide which identified model gives the
best prediction of the closed loop system behavior (for a
certain controller).
3 validation techniques are provided:
- statistical tests on the prediction error
- proximity analysis
. the achiewed poles are obtained by identification of the
closed loop
. the computed poles are obtained using the identified model
and the controller
- time domain validation
. comparison of real and simulated data
DISTRIBUTION KIT
-
Floppy disk containing programs, help files and example data
files
- User's manual (operating instructions, theory, examples)
MINIMAL
HARDWARE/SOFTWARE CONFIGURATION
- PC type
386 (or: 486, Pentium) under Windows 3.1 or Windows 95 with
1 Mo RAM (recommended: 2 Mo)
- WinPIM software (Adaptech). |
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