Tuning rules for the PI gains of field-oriented controllers ofinduction motors
Chang, G.-W.; Espinosa-Perez, G.; Mendes, E.; Ortega, R.
Industrial Electronics, IEEE Transactions on
Volume 47, Issue 3, Jun 2000 Page(s):592 - 602
Digital Object Identifier 10.1109/41.847900
Summary:The authors have previously shown that field-oriented controllers
for induction motors preserve stability under a wide range of variations
of the motor and controller parameters. However, as is well known, the
transient performance critically depends on the tuning of the gains of
the proportional-integral (PI) velocity loop, a task which is rendered
difficult because of the high uncertainty on the rotor resistance. The
problem we address in this paper is how to develop an offline procedure
to choose these gains. The main contribution of our work is a very
simple frequency-domain test that, for each setting of the PI gains,
evaluates the maximum range of the relative rotor resistance estimate
for which global stability is guaranteed. In this way, we provide a
quantitative estimate of the performance of the PI controller. The
stability result may also be used in a dual manner, fixing now the range
of the rotor resistance, and estimating an admissible interval for the
PI gains that preserves global stability. Instrumental for our study is
the exploitation of an energy dissipation (strict passivity) property of
the system
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