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On the globally defined sensorless control of induction motors
Author(s) -
Guerrero C.,
EspinosaPérez G.,
Moreno J. A.,
ÁlvarezSalas R.
Publication year - 2008
Publication title -
international journal of robust and nonlinear control
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.361
H-Index - 106
eISSN - 1099-1239
pISSN - 1049-8923
DOI - 10.1002/rnc.1294
Subject(s) - control theory (sociology) , observability , passivity , robustness (evolution) , control engineering , induction motor , computer science , observer (physics) , nonlinear system , controller (irrigation) , supervisor , scheme (mathematics) , control (management) , engineering , mathematics , voltage , biochemistry , quantum mechanics , artificial intelligence , biology , law , political science , electrical engineering , gene , agronomy , chemistry , physics , mathematical analysis
The sensorless control problem of induction motors imposes a current challenge since the nonlinear model of this kind of machines does not exhibit global observability properties, i.e. there are some operation regimes for which speed observability is lost. One way for dealing with this unavoidable limitation, and at the same time provide globally defined controllers, is to consider that the rotor variables are estimated via an open‐loop observer. In this paper a globally defined passivity‐based speed controller that belongs to the aforementioned class is presented. It is shown that the structure of previously reported passivity‐based controllers, developed under the assumption that the mechanical variables are available for measurement, can be extended to operate under sensorless conditions if a speed observer is included in the control scheme. Since the controller design methodology leads to inherent drawbacks regarding robustness issues, to evaluate the usefulness of the proposed scheme a numerically based study is included that cover topics such as parameters and disturbance (load torque) uncertainty. The advantages and limitations of the proposed scheme are established with respect to other globally defined sensorless controllers. Copyright © 2008 John Wiley & Sons, Ltd.