Comment on “Impact of Load Frequency Dependence on the NDZ and Performance of the SFS Islanding Detection Method”

International audienceWe read with interest an article [1] published in the IEEE Transactions on Industrial Electronics in 2011 and tried to reproduce the results of this article for the needs of our own research. Unfortunately, we were led to think that the load model equations used by the authors contained an inconspicuous but significant mathematical error, leading to erroneous results and conclusion. The present paper brings a correction to some figures and their analysis as well as the paper conclusion. The new results show that the load's frequency dependence has actually no significant impact on the NDZ of the SFS method. Index Terms—Distributed generation (DG), inverter, islanding detection, Sandia frequency shift (SFS)