--- On Sat, 2/13/10, August Goers <aug...@luminalt.com> wrote:
From: August Goers <aug...@luminalt.com>
Subject: [RE-wrenches] anti islanding?
To: "RE-wrenches" <re-wrenches@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
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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
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