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

Abstract

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.

Inventors:

Bhowmik, Shibashis; Mazhari, Iman; Parkhideh, Babak

Issue Date:

2018-06-12

Research Org.:

Sinewatts, Inc., Charlotte, NC (United States); The University of North Carolina at Charlotte, Charlotte, NC (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1457413

Patent Number(s):

9997920

Application Number:

14/860,159

Assignee:

Sinewatts, Inc. (Charlotte, NC); The University of North Carolina at Charlotte (Charlotte, NC)

Patent Classifications (CPCs):

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02E - REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

H - ELECTRICITY H02 - GENERATION H02J - CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER

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Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02E - REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

Y02E10/56 - Power conversion electric or electronic aspects

H - ELECTRICITY H02 - GENERATION H02J - CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER

H02J3/381 - {Dispersed generators}
H02J3/388 - {Islanding, i.e. disconnection of local power supply from the network}
H02J2300/24 - of photovoltaic origin
H02J3/383 - {Solar energy, e.g. photovoltaic energy

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DOE Contract Number:  

EE0006459

Resource Type:

Patent

Resource Relation:

Patent File Date: 2015 Sep 21

Country of Publication:

United States

Language:

English

Subject:

47 OTHER INSTRUMENTATION