The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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Reactive Power P&O Islanding Detection Method using Positive Feedback

Positive Feedback을 이용한 무효전력 P&O 단독운전 검출기법

  • Lee, Jong-Won (Dept. of Electrical & Information Eng., Seoul Nat'l Univ. of Science and Technology) ;
  • Park, Sung-Youl (Dept. of Electrical & Information Eng., Seoul Nat'l Univ. of Science and Technology) ;
  • Lee, Jae-Yeon (Dept. of Electrical & Information Eng., Seoul Nat'l Univ. of Science and Technology) ;
  • Choi, Se-Wan (Dept. of Electrical & Information Eng., Seoul Nat'l Univ. of Science and Technology)
  • Received : 2022.03.11
  • Accepted : 2022.04.20
  • Published : 2022.10.20
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Abstract

A grid-connected inverter with critical loads uses mode transfer control to supply stable voltage to the load. An islanding detection method should also be used to quickly detect the grid fault and disconnect the inverter from the grid. However using the existing islanding detection method to detect islanding is difficult due to the small fluctuation of the voltage and frequency of the point of common coupling. This study proposes a reactive power P&O islanding detection method by using the positive feedback technique. The proposed method always injects a small variation of reactive power. When a grid fault occurs, the injected reactive power accelerates the reactive power injection reference. As a result, the reactive power reference value and the sensed reactive power become mismatched, and islanding is detected. Reducing the amount of real-time injected reactive power results in high efficiency and power factor. The simulation and experimental results of a 3 kW single-phase inverter are provided to verify the proposed islanding detection method.

Keywords

Acknowledgement

이 논문은 정부(과학기술정보통신부)의 재원으로 한국연구 재단의 지원을 받아 수행된 연구임 (No.2020R1A2C200630113)

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