Automatic nonlinear auto-tuning method for Hammerstein modeling ofelectrical drives
Balestrino, A.; Landi, A.; Ould-Zmirli, M.; Sani, L.
Industrial Electronics, IEEE Transactions on
Volume 48, Issue 3, Jun 2001 Page(s):645 - 655
Digital Object Identifier 10.1109/41.925592
Summary:Accurate modeling of electrical drives for online testing is a
relevant problem, because of their nonlinear behavior. Efficient
modeling for simulation, performance evaluation, and testing must
consider accurate as well as simple models. This paper proposes the
application of auto-tune methods to identify equivalent Hammerstein
models, where the nonlinear process is approximated by a static
nonlinear element followed by a linear dynamic second or third-order
model. The effectiveness of the presented procedure is first verified by
simulation results, showing that Hammerstein models overcome the
limitations inherent to small-signal linearizations. A standard
implementation of such technique considers a relay adjustment for
attempts in a heuristic way. In this paper, two innovations are
proposed: the relay adjustment is automatically shifted and the method
is applied for complex electric drives. Experimental results are shown
in the case of a drive constituted by a DC/AC inverter supplying a
single-phase induction motor and of a step-down chopper
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