[RE-wrenches] grid tie sync with big stiff genny?

[Mark Edmunds]

Hi Drake, Geoff,

 

We did a test installation in northern British Columbia with 28kW of PV
and GT5 inverters selling to a 90kW Genny system in a remote off-grid
community. So far we have just stuck to the normal 1741 islanding
settings, and the system has been working smoothly. The PV was basically
sized so that it would not exceed the lowest mid-day load on the small
grid, and there was already an automatic dump load in the system to
ensure the diesels never became completely unloaded.

 

So far the system has been working very well, with good fuel saving for
the community. You can read more about it here.

 

http://nemiahpower.blogspot.com/

 

 

Cheers,

 

Mark

 

 

Mark Edmunds, P.Eng.
Director Engineering 
Residential Renewable Energy Markets 
Xantrex Technology Inc. 


E-mail: mark.edmunds at xantrex.com 
Website: www.xantrex.com <http://www.xantrex.com>  



 

 

-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Drake
Chamberlin
Sent: Thursday, March 12, 2009 7:40 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] grid tie sync with big stiff genny?

 

This should be possible.  I have discussed what it might take to set 

up a system like that in the Gambia, with wind generators.  It would 

take a control system with differential current sensors and other 

features.  The UL 1741 specifications would probably need to be 

opened up on multiple direct grid tie inverters. There would be a 

practical limit on the percentage of feed to the generator mini grid.

 

This being said, I've not received much encouragement with this 

idea.  There are a lot of factors to consider.

 

 

At 09:35 AM 3/11/2009, you wrote:

 

>Undoubtably many of us are getting interesting project requests as 

>folks want to sprinkle magic stimulus dust on things to make solar 

>panels grow...

> 

> 

> 

>We have a project with a huge electrical load, pumping water for a 

>medium sized city.  They want solar... great.  Easy.

> 

> 

> 

>They had a power outage and kept running with 2.6 MW of diesel 

>generators.  They are interested in solar's ability to do 

>"backup".  I don't think that many batteries will fit in my pickup 

>truck, and I hate working with 300/0 wire.

> 

> 

> 

>QUESTION:  (and maybe its an easy one and the SMA guys will say, 

>sure, we did that in Greece).  Is it viable to set up a micro-grid 

>in this scenario and run an island-mode, with available solar 

>reducing the genny plant demand?  Should I just say "forget it" or, 

>at this MW scale, would the switchgear and effort be practical?

> 

> 

> 

>Thanks.

> 

>For a brighter energy future,

> 

>Geoff Greenfield

>President

>Third Sun Solar & Wind Power Ltd.

>340 West State Street, Unit 25

>Athens, OH 45701

> 

>740.597.3111     Fax 740.597.1548

>www.Third-Sun.com

> 

>Clean Energy - Expertly Installed

> 

> 

 

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