Journal
ELECTRIC POWER SYSTEMS RESEARCH
Volume 80, Issue 12, Pages 1413-1420Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.epsr.2010.06.003
Keywords
DVR; Voltage sags; Voltage swells; Harmonics elimination; Flicker; Single-phase direct converter
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In this paper, a new topology is proposed for a single-phase dynamic voltage restorer (DVR) using direct ac/ac converter. This topology does not require dc-link energy storage elements. The proposed topology has a simple structure and can compensate several types of voltage disturbances such as voltage sags, swells, harmonics and flickers. This topology will not face any problem in long time compensation due to the fact that it provides the required energy directly through grid. The proposed topology can be easily extended to n-phase systems such as three-phase based on the same principle of the operation. In n-phase systems, the voltage sags and swells can be properly compensated regardless of the balanced or unbalanced operation. A new control method is also proposed for direct ac/ac converter in the proposed topology. The simulation and experimental results verify the effectiveness of the proposed topology and its control method in voltage restoration. (C) 2010 Elsevier B.V. All rights reserved.
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