Sounds like a job for a directional relay - utilities use them. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Drake Sent: Tuesday, February 12, 2013 7:29 PM To: RE-wrenches Subject: Re: [RE-wrenches] Generator Controlled Mini Grid
Hi Kevin, Right now we are in the stages of investigating what is possible. The design is for 10kW of PV - inverter capacity. The inverters will be Sunny Boys, so if may be possible to regulate them. We haven't decided on a generator yet. A dump load sounds like a good way to absorb excess power. Have you heard of electronic controls to facilitate this process? Thanks, Drake At 03:43 PM 2/12/2013, you wrote: >Hi Drake, > >Further, can you give us an idea what scale you are talking here - ie >PV and Generator capacity? With your mention of inverter/generator if >your talking ie the small Honda EU6500 or such? > >I did think of another project that I am involved with - it's a remote >community with conventional diesel power plant (100 kW day, >30 kW night). There is 27 kW of distributed PV over 5-6 different >homes, using the older Xantrex GT inverters. It's not the most >elegantly designed solution - as it's possible for PV output to be >greater than the load which causes shutdowns. In that case, a dump load >is kicked in briefly and that bumps the frequency enough to kick the GT >inverters offline, and then the cycle repeats. > >Not my design, but it does work and has been this way for several years now. > >Kevin > >-----Original Message----- >From: [email protected] >[mailto:[email protected]]On Behalf Of Drake >Sent: February 10, 2013 10:46 AM >To: RE-wrenches >Subject: Re: [RE-wrenches] Generator Controlled Mini Grid > > >Hi Kevin, > >Thanks for the Eigg video. What a great place. > >I didn't see evidence of any AC coupling of inverter produced AC to a >generator produced mini grid. I understand this is being done in a >homebrew manner by some. > >The current wisdom on the issue is that the less the PV contribution to >the generator supplied grid is, the easier. It would seem that if a >grid tie inverter output could be regulated, using Sunny Island type >controls, it should be possible to have a small inverter generator >create a mini grid that could be fed by PV. > >A system featuring this type of technology was linked in a posting on >this list some years ago, The link seems dead now. In that case a >large generator was feeding a number of houses, and PV was fed into the >system. > >The reason for this interest is that battery backup systems are much >more expensive than generators. We need to find a way to utilize PV >arrays during outages without the expense of battery backup systems. > >Drake > > >At 07:42 PM 2/8/2013, you wrote: > >Hi Drake, > > > >SMA has very good solutions for this. Does this out of the box > >without a bunch of custom control systems. I have put a few systems > >in like this, but the renewables not yet online (generator / battery > >now). If you google Isle of Eig you will find some info on what they > >have done there. > >http://islandsgoinggreen.org/about/eigg-electric/ > > > >Kevin > > > >-----Original Message----- > >From: [email protected] > >[mailto:[email protected]]On Behalf Of Drake > >Sent: February 8, 2013 6:41 AM > >To: RE-wrenches > >Subject: [RE-wrenches] Generator Controlled Mini Grid > > > > > >A potential customer is interested in a mini grid, set up by a > >generator, to connect his array to. > > > >Some years back, on this list, an article was linked about a > >community with a central generator that had PV input to the generator > >supplied, local grid, using electronic controls. > > > >Has any progress been made in this technology? Does anyone have a > >link to the electronic control equipment or any other relevant information? > > > >Thanks, > > > >Drake > > > >_______________________________________________ > >List sponsored by Home Power magazine > > > >_______________________________________________ >List sponsored by Home Power magazine > >List Address: [email protected] > >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: [email protected] > >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: [email protected] 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: [email protected] 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
