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Islanding Detection Method for Grid-connected PV System using Automatic Phase-shift  

Yun, Jung-Hyeok (LS산전 Power Conditioner 연구팀)
Choi, Jong-Woo (경북대 전자전기컴퓨터학부)
So, Jung-Hun (에너지기술연구원 태양광발전연구단)
Yu, Gwon-Jong (에너지기술연구원 태양광발전연구단)
Kim, Heung-Geun (경북대 전자전기컴퓨터학부)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.12, no.2, 2007 , pp. 107-114 More about this Journal
Abstract
Islanding of PV systems occurs when the utility grid is removed but the PV systems continue to operate and provide power to local loads. Islanding is one of the serious problems in an electric power system connected with dispersed power sources. This can present safety hazards and the possibility of damage to other electric equipments. In the passive method, the voltage and frequency of PCC are measured and it determines islanding phenomena if their values excess the allowed limits. If the real and reactive power of RLC load and those of the PV system are closely matched, islanding phenomena can't be detected by the passive methods. Several active methods were proposed to detect islanding operation in the region where the passive method can not detect it. The most effective method is SFS method which was suggested by Sandia National Laboratory. In this paper, a new islanding detection method using automatic phase-shift is proposed and its validity is verified through the simulation and experimental results.
Keywords
Islanding of PV systems; Grid-connected PV system; Islanding detection method; Automatic phase-shift;
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