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

  • 제17권2호
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  • Pages.93-98
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  • 2012
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  • 1229-2214(pISSN)
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  • 2288-6281(eISSN)
전력전자학회 (The Korean Institute of Power Electronics)
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DFT를 이용한 계통연계 인버터 시스템의 고정밀 계측

High Precise Measurement of Grid-Connected Inverter using DFT

  • Lee, Sang-Hyeok (Dept. of Electrical Engineering, Chonnam Nat'l Univ.) ;
  • Kang, Feel-Soon (Dept. of Control and Instrumentation Engineering, Hanbat Nat'l Univ.) ;
  • Lee, Sang-Hun (Dept. of Electrical Design, Korea Lift College) ;
  • Cho, So-Eog (Dept. of Electrical Engineering, Seoil College) ;
  • Lee, Tae-Won (Power Advanced Development, Samsung Electro-Mechanics) ;
  • Park, Sung-Jun (Dept. of Electrical Engineering, Chonnam Nat'l Univ.)
  • 투고 : 2011.10.11
  • 심사 : 2011.12.17
  • 발행 : 2012.04.20
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초록

A precise measurement of the grid voltage is one of the essential techniques, which is required to connect a renewable energy to the grid. In general, when a filter is used to eliminate unnecessary harmonics and noises, a signal is distorted by phase delay, amplitude attenuation, and other distortions. And the response characteristic of a controller is directly affected by bandwidth of cut-off frequency of the filter. To alleviate this problems, we propose an effective algorithm based on DFT(Discrete Fourier Transform) instead of approaching the filter application. The proposed algorithm ensures high precise measurement of the grid voltage because it can extract the fundamental and harmonics from the raw signal without any distortions. The high performance of the proposed algorithm is verified by PSIM simulation and experiments of Grid-Connected VSI.

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참고문헌

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  5. J-H Kim, Y-H Ji, C-Y Won, Y-C Jung, "PLL Method Using The Improved Discrete Fourier Transform", Power Electronics Annual Conference, pp. 91-93, 2001.
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  7. D-H Knag, D-K Choi, K-B Lee, "Performance Improvement of an Anti-Islanding Algorithm using the Variation of Reactive Power with an Improved DFT Method", Journal of the korean institute of Power Electronics, Vol. 15, No. 3, pp. 179-187, 2010. 6. https://doi.org/10.6113/TKPE.2010.15.3.179
  8. I-S Kim, "Study on the Islanding Detection Technique of the Grid-Connected Photovoltaic System using Grid Voltage Harmonic Coefficients", Journal of the korean institute of Power Electronics, Vol. 15, No. 6, pp. 417- 424, 2010. 12. https://doi.org/10.6113/TKPE.2010.15.6.417
  9. J-E Lee, J-K Min, I-S Kim, "Study on the Harmonic Extraction Technique of the Power Conditioning System using High Performance DSP Controller", Journal of the korean institute of Power Electronics, Vol. 15, No. 4, pp. 266-273, 2010. 8. https://doi.org/10.6113/TKPE.2010.15.4.266
  10. Lu, S.-L., "Application of DFT filter bank to power frequency harmonic measurement", Proceedings of the IEEE, Vol. 152, No. 1, pp. 132-136, 2005, January.
  11. Sunt Srianthumrong, Somboon Sangwongwanich, "An active power filter with harmonic detection method based on recursive DFT", IEEE 8th international conference on harmonic and quality of power, Athens, pp. 127-132, 1998, October.
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피인용 문헌

  1. Improved Phase and Harmonic Detection Scheme using Fast Fourier Transform with Minimum Sampling Data under Distorted Grid Voltage vol.20, pp.1, 2015, https://doi.org/10.6113/TKPE.2015.20.1.72
  2. A Study of Detection Algorithms and Analysis Series Arc of Quasi-arc Load vol.28, pp.7, 2014, https://doi.org/10.5207/JIEIE.2014.28.7.081