Title: Detection of islanding in power grids
Application Number: 200610136533 Application Date: 2006.10.26
Publication Number: 1956286 Publication Date: 2007.05.02
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H02J1/10;H02J3/38;H02P9/00;H02P9/04;G01R21/00;G01R27/00;G01R19/00
Applicant(s) Name: Gen Electric Address:
Inventor(s) Name: Walling Reigh A.;Langel Andre
Attorney & Agent: wenda peng liuhua lian
Abstract:
    A method for detecting islanding conditions in an electrical grid having a power line voltage includes monitoring a detectable signal (306) different from the power line voltage at a generating station (310), superimposing the detectable signal onto the power line voltage at a grid point (308) outside the generating station, and switching the generating station from a grid-connected mode of operation to an islanded mode of operation when the signal to which the detector (312) is responsive is determined to be absent.
Time: 10