Detection Performance and THD Analysis of Active Frequency Drift for Anti-Islanding

단독운전 방지를 위한 능동적 주파수 변환 기법의 검출 성능 및 THD 분석

  • Received : 2015.01.16
  • Accepted : 2015.04.20
  • Published : 2015.04.30


Islanding is a phenomenon that EPS(Electric Power System) is continuously energized by PV PCS(Photovoltaic Power Conditioning System) even when EPS is isolated from the grid. Unintentional islanding will result in safety hazard, power quality degradation and many other issues. So, islanding protection of grid-connected PV PCS is a key function for standards compliance. Nowadays, many anti-islanding schemes are researched. But existing anti-islanding schemes used in PV PCS have power quality degradation and non-detection zone issues. This paper analyses not only detection performance of existed anti-islanding schemes using active frequency drift but also THD of PCS output current according to each value disturbance for anti-islanding. In addition, the lowest value of disturbance in each scheme was tabulated under guarantee of anti-islanding condition.



  1. Ki-Ok Lee, "Output Power Analysis for Active Frequency Drift Method", Journal of the Korea Solar Energy Society, Vol. 29, No. 6, pp. 75-80, 2009
  2. Jung-Hun So, "A Study on Performance Analysis of 3kW Grid-Connected PV System", Journal of the Korea Solar Energy Society, Vol. 24, No. 2, pp. 9-15, 2004
  3. Moon-Ju Ko, "Novel AFD Method of Islanding Detection with a Periodic Zero Current for Improving on Islanding Detection for Grid-Connected Photovoltaic Inverters", Journal of the Korea Solar Energy Society, Vol. 26, No. 4, pp. 17-23, 2006.
  4. Z. Ye, A. Kolwalkar, Y. Zhang, P. Du and R. Walling, "Evaluation of Anti-Islanding Schemes Based on Non Detection Zone Concept", IEEE Trans. on Power Electronics. pp. 1171-1176, 2004
  5. Young-Seok Jung, "Analysis of Active Islanding Detection Methods for a Single-Phase Photovoltaic Power Conditioning Systems", Journal of the Korean Institute of Electrical Engineers, pp. 1477-1479, 2004.