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Reactive Power Control Method for Grid-Tie Inverters Using Current Measurement of DG Output

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Abstract

The penetration ratio of distributed generation (DG) has increased due to the depletion of fossil fuels and the impacts of global warming. Thus, overvoltage at the point of common coupling may occur since reverse current flows with the installment of DG. To solve this problem, this paper presents a reactive power control method based on the measured current at the point of common coupling of DG. The purpose of this paper is not to provide methods to improve the voltage profiles of distribution lines through the reactive power control, but to maintain the voltage after the DG connection as before the connection. By applying the proposed method in this paper, it is possible to significantly improve the penetration ratio of DG by restricting the voltage rise. Case studies, using MATLAB simulation, are performed to verify the feasibility of the new reactive power control method.

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Acknowledgements

This work was supported by “Human Resources Program in Energy Technology” of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource by the Ministry of Trade, Industry and Energy, Republic of Korea. (No. 20174030201790)

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Authors and Affiliations

  1. Department of Electrical Engineering, Kyungnam University, Changwon, South Korea

    Jihui Hwang & Seongil Lim

  2. Department of Electrical Engineering, Myongji University, Yongin, South Korea

    Myeonsong Choi

  3. Digital Solution Lab, KEPCO Research Institute, Daejeon, South Korea

    Myongsoo Kim

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  1. Jihui Hwang
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  2. Seongil Lim
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  3. Myeonsong Choi
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  4. Myongsoo Kim
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Correspondence to Myongsoo Kim.

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Hwang, J., Lim, S., Choi, M. et al. Reactive Power Control Method for Grid-Tie Inverters Using Current Measurement of DG Output. J. Electr. Eng. Technol. 14, 603–612 (2019). https://doi.org/10.1007/s42835-019-00104-1

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  • DOI: https://doi.org/10.1007/s42835-019-00104-1

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