Identification for control: closing the loop gives more accurate controllers

• We compare open loop versus closed loop identification when the identified model is used for control design, and when the system itself belongs to the model class, so that only variance errors are relevant. For three different control design criteria (minimum variance, LQG and model) reference control) we show that, under those conditions, a better performance is achieved by closing the loop during the identification. The measure of performance is the variance of the error between the output of the ideal closed loop system (with the ideal controller) and that of the actual closed loop system (with the controller computed from the identified model).

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik -- Reglerteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering -- Control Engineering (hsv//eng)

Nyckelord

Calculations

Closed loop control systems

Control system synthesis

Errors

Least squares approximations

Linear control systems

Mathematical models

Optimal control systems

Perturbation techniques

Set theory

Time varying control systems

Transfer functions

Least squares prediction error

Linear quadratic Gaussian design

Minimum variance control design

Model reference design

Identification (control systems)

SRA - ICT

SRA - Informations- och kommunikationsteknik

TECHNOLOGY

Publikations- och innehållstyp

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