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http://dx.doi.org/10.6113/JPE.2019.19.2.519

Precise Modeling and Adaptive Feed-Forward Decoupling of Unified Power Quality Conditioners  

Wang, Yingpin (College of Physics and Electronic Engineering, Hainan Normal University)
Obwoya, Rubangakene Thomas (College of Physics and Electronic Engineering, Hainan Normal University)
Li, Zhibo (College of Physics and Electronic Engineering, Hainan Normal University)
Li, Gongjie (College of Physics and Electronic Engineering, Hainan Normal University)
Qu, Yi (Hainan Province Key Laboratory of Laser Technology and photoelectric Functional Materials)
Shi, Zeyu (School of Electric Power, South China University of Technology)
Zhang, Feng (School of Electric Power, South China University of Technology)
Xie, Yunxiang (School of Electric Power, South China University of Technology)
Publication Information
Journal of Power Electronics / v.19, no.2, 2019 , pp. 519-528 More about this Journal
Abstract
The unified power quality conditioner (UPQC) is an effective custom power device that is used at the point of common coupling to protect loads from voltage and current-related PQ issues. Currently, most researchers have studied series unit and parallel unit models and an idealized transformer model. However, the interactions of the series and parallel converters in AC-link are difficult to analyze. This study utilizes an equivalent transformer model to accomplish an electric connection of series and parallel converters in the AC-link and to establishes a precise unified mathematical model of the UPQC. The strong coupling interactions of series and parallel units are analyzed, and they show a remarkable dependence on the excitation impedance of transformers. Afterward, a feed-forward decoupling method based on a unified model that contains the uncertainty components of the load impedance is applied. Thus, this study presents an adaptive method to estimate load impedance. Furthermore, simulation and experimental results verify the accuracy of the proposed modeling and decoupling algorithm.
Keywords
Adaptive feed-forward decoupling; Interaction analysis; Power quality; Precise unified modeling; UPQC;
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