[RE-wrenches] anti islanding?

[boB Gudgel]

> --- On Sat, 2/13/10, August Goers <august at luminalt.com> wrote:
>
>   
>> From: August Goers <august at luminalt.com>
>> Subject: [RE-wrenches]  anti islanding?
>> To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
>> Date: Saturday, February 13, 2010, 10:29 AM
>> 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
>>
>>
>>     


Without having to obtain the UL or IEEE1547 specs, there is some real 
techy information online at Sandia and NREL...  For instance,


http://www.nrel.gov/docs/fy04osti/36243.pdf

http://prod.sandia.gov/techlib/access-control.cgi/2002/021320.pdf


This link includes some Trace SW5548 tests...
http://photovoltaics.sandia.gov/docs/PDF/IEEE%20Jerry%202.pdf

There is lots more if you  Google for it.   I find it interesting, but 
would put most
people to sleep.  Good thing they're looking for techy info.


boB


>> 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 at 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
>>
>>
>>     
> Darryl Thayer wrote:
>   
>> Hi 
>> I hope you get an expert, but here is what I understand.  Of course if the grid goes to zero it is easy to break under voltage.  But if the grid has a motor particularly a synchronous motor, it can generate a sine wave, so the inverter always trys to increase the speed or frequency of the sine wave if it can, or speed up the motor it drives out of the frequency range and shuts down.  also the inverter tries to raise the voltage if it can it shuts down. So the inverter is always trying to raise voltage or increase frequency, if it can it shuts down.   Also in the motor case if the inverter cannot supply enougn power the motor will slow down and the inverter quits suts down.  
>> Darryl  
>>