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Islanding Prevention Method for Photovoltaic System by Harmonic Injection Synchronized with Exciting Current Harmonics of Pole Transformer

  • Received : 2014.04.23
  • Accepted : 2014.05.15
  • Published : 2014.09.01

Abstract

When large penetration of the distributed generators (DGs) such as photovoltaic (PV) systems is growing up in grid system, it is important to quickly prevent islanding caused by power system fault to ensure electrical safety. We propose a novel active method for islanding prevention by harmonic injection synchronized with the exciting current harmonics of the pole transformer to avoid mutual interference between active signals. We confirm the validity of the proposed method by performing the basic tests of islanding by using a current source superimposed the harmonic active signal. Further, we carry out the simulation using PSCAD/EMTDC, and verify the fast islanding detection.

Keywords

References

  1. Japan Electric Association, Grid-interconnection Code JEAC9701, Ohmsha, 2012 (in Japanese).
  2. Japan Electrical Safety & Environment Technology Laboratories (JET), "Individual Test Method of Gridconnected Protective Equipment etc. for Multi-unit Grid-connected PV Power Generating Systems", JETGR0003-4-1.0, 2011. p. 4 (in Japanese).
  3. Kandenko, "Demonstrative Research on Grid- Interconnection of Clustered Photovoltaic Power Generation Systems", NEDO H15-19 Investigative Report, 2008, pp.42-44, p.643, p.705 (in Japanese).
  4. IEC 62116 Ed.1, "Test procedure of islanding prevention measures for utility interconnected photovoltaic inverters", 2008, p. 7, p. 13.
  5. H. Kobayashi, M. Itou, CRIEPI REPORT, "De velopment of Transient Analysis Model of Grid Interconnected PCS for Photovoltaic Power Generation", R07027, pp. 2-4, 2008 (in Japanese).
  6. W. Bower, M. Ropp, SANDIA REPORT, "Evaluation of Islanding Detection Methods for Utility-Interactive Inverters in Photovoltaic Systems", SAND2002-3591, pp. 46-48.