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

Patent ·
OSTI ID:1457413
; ;

Various examples are directed to systems and methods for detecting an islanding condition at an inverter configured to couple a distributed generation system to an electrical grid network. A controller may determine a command frequency and a command frequency variation. The controller may determine that the command frequency variation indicates a potential islanding condition and send to the inverter an instruction to disconnect the distributed generation system from the electrical grid network. When the distributed generation system is disconnected from the electrical grid network, the controller may determine whether the grid network is valid.

Research Organization:
Sinewatts, Inc., Charlotte, NC (United States); The University of North Carolina at Charlotte, Charlotte, NC (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
EE0006459
Assignee:
Sinewatts, Inc. (Charlotte, NC); The University of North Carolina at Charlotte (Charlotte, NC)
Patent Number(s):
9,997,920
Application Number:
14/860,159
OSTI ID:
1457413
Resource Relation:
Patent File Date: 2015 Sep 21
Country of Publication:
United States
Language:
English

References (21)

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Bi-directional power conversion apparatus for combination of energy sources patent July 2001
Anti-islanding device and method for grid connected inverters using random noise injection patent February 2005
Method and apparatus for anti-islanding protection of distributed generations patent March 2006
Control of small distributed energy resources patent October 2006
Method, memory media and apparatus for detection of grid disconnect patent September 2008
Frequency control and power balancing in disturbed power inverter system and method thereof patent February 2009
Control of small distributed energy resources patent March 2010
Substantially bumpless transfer grid synchronization patent November 2012
Method and area electric power system detecting islanding by employing controlled reactive power injection by a number of inverters patent December 2012
Voltage-sensed system and method for anti-islanding protection of grid-connected inverters patent April 2013
Systems and methods for increasing output current quality, output power, and reliability of grid-interactive inverters patent July 2014
Micro-grid PV system patent September 2016
Power system islanding detection with waveform fitting patent June 2017
System and Method for Anti-Islanding, Such as Anti-Islanding for a Grid-Connected Photovoltaic Inverter patent-application May 2008
Systems and Methods for Islanding Detection patent-application November 2011
Control Device of Wind Turbine Generator and Control Method Thereof patent-application December 2011
Supervisory Control Method and Equipment for Smart Grids patent-application February 2012
Systems and Methods for Solar Photovoltaic Energy Collection and Conversion patent-application July 2013
Locking frequency band exposure method for islanding detection and prevention in distributed generation conference September 2014
Locking frequency band detection method for grid-tied PV inverter islanding protection conference September 2015

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