Dissipativity-based adaptive and robust control of UPS
Mattavelli, P.; Escobar, G.; Stankovic, A.M.
Industrial Electronics, IEEE Transactions on
Volume 48, Issue 2, Apr 2001 Page(s):334 - 343
Digital Object Identifier 10.1109/41.915412
Summary:In this paper, we investigate the output voltage control for a
three-phase uninterruptible power supply (UPS) using controllers based
on ideas of dissipativity. To provide balanced sinusoidal output
voltages, even in the presence of nonlinear and unbalanced loads, we
first derive a dissipativity-based controller using a frequency-domain
representation of system dynamics. Adaptive refinements have been added
to the controller to cope with parametric uncertainties. Second, based
on the first adaptive controller, we propose a controller which turns
out to have the proportional-plus-integral-type structure on
rotating-frame variables, but with a special design of gain matrices. A
sufficient condition in terms of the design parameters is presented for
this controller that guarantees stability of the desired equilibrium and
robustness against parameter uncertainties. Finally, simulation and
experimental results on a three-phase prototype show effectiveness and
advantages of the proposed approach
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