Dissipativity-based adaptive and robust control of UPS in unbalanced operation

In this paper, we investigate the output voltage control for 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...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2003-07, Vol.18 (4), p.1056-1062
Main Authors: Valderrama, G.E., Stankovic, A.M., Mattavelli, P.
Format: Article
Language:English
Subjects:
Adaptive control
Adaptive control systems
Control systems
Controllers
Dissipation
Dynamical systems
Electric potential
Electronics
Nonlinear control systems
Nonlinear dynamical systems
Programmable control
Representations
Robust control
Robust stability
Surge protectors
Uncertainty
Uninterruptible power systems
UPS
Voltage
Voltage control
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Summary:In this paper, we investigate the output voltage control for 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 conventional /spl alpha//spl beta/ (fixed frame) representation of system dynamics and a frequency-domain representation of system disturbances. Adaptive refinements have been added to the controller to cope with parametric uncertainties. Second, based on the structure of the first adaptive controller, we propose another controller that leads to a linear time-invariant (LTI) closed loop system which is directly connected to synchronous frame harmonic voltage control. This controller, denoted as robust, avoids the most computationally demanding parameter estimation during adaptation, and offers important advantages for implementation. For the proposed robust controller, a sufficient condition in terms of the design parameters is presented to guarantee stability of the desired equilibrium and robustness against certain parametric uncertainties. Finally, simulation and experimental results on a three-phase prototype show effectiveness and advantages of the proposed class of controllers.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2003.813768