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Title: Method, memory media and apparatus for detection of grid disconnect

Abstract

A phase shift procedure for detecting a disconnect of a power grid from a feeder that is connected to a load and a distributed generator. The phase shift procedure compares a current phase shift of the output voltage of the distributed generator with a predetermined threshold and if greater, a command is issued for a disconnect of the distributed generator from the feeder. To extend the range of detection, the phase shift procedure is used when a power mismatch between the distributed generator and the load exceeds a threshold and either or both of an under/over frequency procedure and an under/over voltage procedure is used when any power mismatch does not exceed the threshold.

Inventors:
 [1];  [2]
  1. Clifton Park, NY
  2. Troy, NY
Issue Date:
Research Org.:
GE Global Research, Niskayuna, New York (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
984516
Patent Number(s):
7427815
Application Number:
10/713,310
Assignee:
General Electric Company (Niskayuna, NY)
Patent Classifications (CPCs):
H - ELECTRICITY H02 - GENERATION H02J - CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER
G - PHYSICS G01 - MEASURING G01R - MEASURING ELECTRIC VARIABLES
DOE Contract Number:  
AND-1-30605-01
Resource Type:
Patent
Resource Relation:
Patent File Date: 2003 Nov 14
Country of Publication:
United States
Language:
English
Subject:
24 POWER TRANSMISSION AND DISTRIBUTION

Citation Formats

Ye, Zhihong, and Du, Pengwei. Method, memory media and apparatus for detection of grid disconnect. United States: N. p., 2008. Web.
Ye, Zhihong, & Du, Pengwei. Method, memory media and apparatus for detection of grid disconnect. United States.
Ye, Zhihong, and Du, Pengwei. Tue . "Method, memory media and apparatus for detection of grid disconnect". United States. https://www.osti.gov/servlets/purl/984516.
@article{osti_984516,
title = {Method, memory media and apparatus for detection of grid disconnect},
author = {Ye, Zhihong and Du, Pengwei},
abstractNote = {A phase shift procedure for detecting a disconnect of a power grid from a feeder that is connected to a load and a distributed generator. The phase shift procedure compares a current phase shift of the output voltage of the distributed generator with a predetermined threshold and if greater, a command is issued for a disconnect of the distributed generator from the feeder. To extend the range of detection, the phase shift procedure is used when a power mismatch between the distributed generator and the load exceeds a threshold and either or both of an under/over frequency procedure and an under/over voltage procedure is used when any power mismatch does not exceed the threshold.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2008},
month = {9}
}

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Works referenced in this record:

Evaluation of Anti-Islanding Schemes Based on Nondetection Zone Concept
journal, September 2004


Determining the relative effectiveness of islanding detection methods using phase criteria and nondetection zones
journal, January 2000