Hi August, I wrote a not-too-technical description of anti-islanding for the Ask the Experts section of Home Power a while back. You can find it online at: http://homepower.com/article/?file=HP130_pg28_ATE_2 or in print in the Apr/May 2009 (#130) issue.
Dana Dana Brandt Ecotech Energy Systems, LLC www.ecotechenergy.com d...@ecotechenergy.com 360.510.0433 On Sun, Feb 14, 2010 at 11:25 AM, August Goers <aug...@luminalt.com> wrote: > Bil, boB, Darryl, > > Thanks for all the input... now I have some good Valentine's Day reading > ;-0 > > -August > > August Goers > > Luminalt Energy Corporation > O: 415.564.7652 > M: 415.559.1525 > F: 650.244.9167 > www.luminalt.com > ________________________________________ > From: re-wrenches-boun...@lists.re-wrenches.org [ > re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Bill Brooks [ > billbroo...@yahoo.com] > Sent: Saturday, February 13, 2010 8:45 PM > To: 'RE-wrenches' > Subject: Re: [RE-wrenches] anti islanding? > > August, > > Probably the best simple explanation is in "Connecting to the Grid", > published by the Interstate Renewable Energy Council and the North Carolina > Solar Center. It is in its 6th edition. I wrote the original version of the > document over 15 years ago. > > Bill. > > Quote from Document: > > "Grid-tied inverters monitor the utility line voltage and frequency > continuously. When abnormal voltage or frequency conditions occur on the > utility system, they shut themselves off quickly (or "cease to energize," > the phrase that appears in technical interconnection standards). > Unintentional islands with inverters are very difficult to sustain because > the inverter is not designed to regulate output voltage. Instead, these > inverters produce current proportional to the available power from the > prime > power source. An Islanding condition would require the source power to > match > real and reactive load conditions thus sustain an unintentional island. > With > dynamic loads and fixed power source the natural tendency of the island to > shift outside the allowable voltage and frequency limits that would > otherwise cause the inverter to trip. Extensive testing of inverters at > Sandia National Laboratories, under a variety of laboratory-controlled > worst-case conditions, led to the development of specific > islanding-detection (or anti-islanding) techniques and a generalized test > procedure for evaluating the efficacy of any anti-islanding device. These > and other anti-islanding techniques reduce the already low probability of > inverter islanding such that devices that pass this test, which is detailed > in IEEE 1547.1-2005, are considered non-islanding. Informative discussions > of islanding and anti-islanding inverters are included in the annexes to > IEEE 929-2000 and in a study titled Results of Sandia National > Laboratories > Grid-Tied Inverter Testing, published in 1998 by Sandia National > Laboratories." > ****** > > -----Original Message----- > From: re-wrenches-boun...@lists.re-wrenches.org > [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of August > Goers > Sent: Saturday, February 13, 2010 8:29 AM > To: RE-wrenches > Subject: [RE-wrenches] anti islanding? > > Hi Wrenches, > > Does anyone know where I can go to read about general information on how > grid tied inver anti islanding works? I'd like to be able to describe this > in better detail to our tech-savvy clients. > > Thanks, > > August > > > August Goers > > Luminalt Energy Corporation > O: 415.564.7652 > M: 415.559.1525 > F: 650.244.9167 > www.luminalt.com > _______________________________________________ > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > >
_______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
