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Abstract
This article proposes a new control approach for an interline unified power quality conditioner and a multi-converter unified power quality conditioner to optimize the utilization of the inverters of these structures. In this method, the series active power filter is controlled by the application of a power angle control concept to compensate an unbalanced voltage (asymmetrical voltage sag/swell with or without phase angle jumps) and also partial-load reactive power for power factor correction. Since voltage variation (sag/swell, unbalance, etc.) is a short-duration power quality problem in distribution systems, under normal operating conditions, series inverters are not utilized effectively in conventional methods. By using the proposed method, optimal utilization of series inverters of both structures and also a reduction in the shunt inverter rating of a multi-converter unified power quality conditioner will be achieved. Also, the shunt active power filter is controlled to compensate the unbalanced current, harmonics, and neutral current of a three-phase four-wire system and to take part in power factor correction. The proposed approach is validated through MATLAB/SIMULINK-based (The MathWorks, Natick, Massachusetts, USA) simulation and the results are discussed.
Additional information
Notes on contributors
Davod Rezaei
Davod Rezaei received his B.Sc. in electrical engineering from Tafrsh University, Tafresh, Iran, in 2011 and his M.Sc. in electrical engineering from University of Isfahan, Isfahan, Iran, in 2014. His research interests are PQ, power electronics, and custom power.
Eskandar Gholipour
Eskandar Gholipour received his B.Sc. from Isfahan University of Technology in 1988; his M.Sc. from University of Tehran, Iran, in 1990; and his Ph.D. from University of Nancy, France, in 2003, respectively, all in electrical engineering. He is currently an assistant professor in the Electrical Engineering Department, University of Isfahan, Isfahan, Iran. His research interests are application of FACTS devices, PQ, and distribution networks.
Rahmat-Allah Hooshmand
Rahmat-Allah Hooshmand received his B.Sc. from University of Mashhad in 1989; his M.Sc. from University of Tehran, Iran, in 1990; and his Ph.D. from Tarbiat Modarres University, Iran, in 1995, respectively, all in electrical engineering. He is currently a professor in the Electrical Engineering Department, University of Isfahan, Isfahan, Iran. His main areas of research interest are modeling of power systems and distribution networks.