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Dissipativity-based adaptive and robust control of UPS

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3 Author(s)
Mattavelli, P. ; Dept. of Electr. Eng., Padova Univ., Italy ; Escobar, G. ; Stankovic, A.M.

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

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:48 ,  Issue: 2 )

Date of Publication:

Apr 2001

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