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Title: System and method for islanding detection and prevention in distributed generation

A method for detecting and preventing islanding includes issuing a command to an inverter connected to a power source, where the inverter is coupled to a power grid and supplies power to the power grid, the command causes a frequency of a waveform output by the inverter to vary, and the frequency of the waveform output by the inverter is a command frequency, determining that a amount of change of the command frequency is a constant value for a predetermined amount of time, removing the power supplied by the inverter from the power grid, and determining whether the power grid is valid.
Inventors:
; ;
Issue Date:
OSTI Identifier:
1472075
Assignee:
SINEWATTS, INC. (Charlotte, NC); THE UNIVERSITY OF NORTH CAROLINA AT CHARLOTTE (Charlotte, NC) DOEEE
Patent Number(s):
10,069,304
Application Number:
14/737,468
Contract Number:
EE0006459
Resource Relation:
Patent File Date: 2015 Jun 11
Research Org:
SINEWATTS, INC., Charlotte, NC (United States); THE UNIVERSITY OF NORTH CAROLINA AT CHARLOTTE, Charlotte, NC (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English

Other works cited in this record:

Anti-islanding method and apparatus for distributed power generation
patent, April 2001

Bi-directional power conversion apparatus for combination of energy sources
patent, July 2001

Method, memory media and apparatus for detection of grid disconnect
patent, September 2008

Method and area electric power system detecting islanding by employing controlled reactive power injection by a number of inverters
patent, December 2012

Systems and methods for increasing output current quality, output power, and reliability of grid-interactive inverters
patent, July 2014

Power system islanding detection with waveform fitting
patent, June 2017

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