Sandia Frequency-Shift Parameter Selection to Eliminate Nondetection Zones

摘要

The Sandia frequency-shift (SFS) method is one of the active islanding detection methods that possesses small nondetection zones (NDZs). The effectiveness of the SFS depends to a great extent on its design parameters ( $cf_{o}$ and $k$). In this letter, a formula is derived to aid protection engineers to determine the optimal parameter setting for the SFS islanding detection method. It is concluded that the parameter $(k)$ has a significant effect on the NDZ and a modified version of the SFS is proposed that relies only on this parameter.