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Novel AFD method of islanding detection with a periodic zero current for improving on islanding detection for grid-connected Photovoltaic inverters  

Ko, Moon-Ju (Dept. of Information and Control Eng., Kwangwoon University)
Choy, Ick (Dept. of Information and Control Eng., Kwangwoon University)
Choi, Ju-Yeop (Dept. of Electrical Eng., Kwangwoon University)
Song, Seung-Ho (Dept. of Electrical Eng., Kwangwoon University)
Lee, Ki-Ok (Dept. of Electrical Eng., Kwangwoon University)
Publication Information
Journal of the Korean Solar Energy Society / v.26, no.4, 2006 , pp. 17-23 More about this Journal
Abstract
This paper proposes a novel active frequency drift (AFD) method for the islanding prevention of grid-connected photovoltaic inverter. To detect the islanding phenomenon of grid-connected photovoltaic (PV) inverters concerning about the safety hazards and the damage to other electric equipments, many kinds of anti-islanding methods have been presented. Among them, AFD method using chopping fraction enables the islanding detection to drift up (or down) the frequency of the voltage during the islanding situation. In this paper, injecting the periodic zero current into the basic AFD method is proposed. This proposed method shows the analytical design value of cf to meet the test procedure of IEEE Std. 1547 with various load conditions. Detection of islanding is verified using simulation tool PSIM.
Keywords
Islanding; grid-connected; PV systems; AFD (active frequency drift); non-detection zone; inverters;
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  • Reference
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