Islanding detection is an important issue in grid-connection of a distributed photovoltaic system. The paper compares complex and real wavelet transforms used in islanding detection. Islanding is judged by extracting and analyzing changes in the amplitude and phase of wavelet transform coefficients of the voltage at common coupling points. Simulation results show that the islanding detection method based on complex wavelet transform is more effective than that based on real wavelet transform. The complex wavelet method also solves the problem of tedious layering of characteristic signal and complicated threshold selection encountered in the real wavelet based method.
FANG Xiao-mei, LUO Xiao-shu, JIANG Pin-qun, SONG Shu-xiang, LIAO Zhi-xian
. Comparison of Complex and Real Wavelet Transforms in Islanding Detection[J]. Journal of Applied Sciences, 2016
, 34(1)
: 42
-48
.
DOI: 10.3969/j.issn.0255-8297.2016.01.005
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