Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Switching cell structured direct AC-AC converter-based three-phase DVR system using interphase voltage

  • Lee, Hyeongmin (Department of Electrical Engineering, Kyungpook National University) ;
  • Kim, Sanghun (Center for Advanced Power Systems (CAPS), Florida State University) ;
  • Cha, Honnyong (School of Energy Engineering, Kyungpook National University) ;
  • Kim, Heung-Geun (Department of Electrical Engineering, Kyungpook National University)
  • Received : 2021.02.25
  • Accepted : 2021.04.20
  • Published : 2021.07.20
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Abstract

This paper presents a dynamic voltage restorer to solve the voltage sag problem that causes the most serious economic loss among various grid accidents. The proposed method, which uses a direct AC-AC converter, consists of a simple controller unlike methods using a voltage source inverter that is controlled using complex operations. Unlike the energy storage type, there is no additional energy storage device, which reduces system cost. In addition, unlike the back-to-back type, energy conversion loss is reduced by one stage conversion. A switching cell-structured direct AC-AC converter that solves the rectification problem without a separate sensor is a reliable structure that reduces the volumes of the passive filters by increasing the switching frequency. In addition, using interphase voltages, it can take a wide range of voltage compensations to compensate for most of the voltage sag in various situations. In this paper, the background of the study is revealed and the operating principles and control schemes of the proposed system are analyzed. Then, the validity of this study is confirmed through simulation and experiment results.

Keywords

Acknowledgement

This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20194030202310).

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