Asynchronous (Induction) Generator

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Comment by Daniel on March 29, 2009 at 12:34am

I am not sure but it should not generate power if the grid goes down?....have not done any testing my self but Kim jessen has this is a question better directed to him.

Comment by Daniel on March 29, 2009 at 12:16am

Andrew,

You bring up and interesting point ….a three phase motor will run on single phase 220 if it is already turning which it would be if it is generating power…I will have to use a microcontroller to engage and disengage it from the grid based on rpms the engine driving it is turning.

Comment by Andrew Schofield on March 28, 2009 at 8:55am

Hi Daniel,

Generation to the grid, or in other words, going parelell with some very big machinery, must be done ONLY in agreement with your utility.
They will require certain saftey devices. Do not do anything without talking to them! A lineman could be killed, if national electrical code is not followed.

A tiny 30 kW generator matching speed with giant machinery is not difficult, but if your engine throws a rod, the alternator becomes a 100 hp motor and the engine will saw itself in half.

I think of it as a brick wall moving down the freeway at 80 MPH. You come up, and attach to it, and then start pushing as hard as you can. You will not change the speed of the wall.

Please consult a qualified, licenced electrician.

Andrew Schofield

Comment by kim jessen on March 20, 2009 at 3:48pm

bay the way, dont, doo not, youse a common generator for putting power on to the grit, you might 75% destrou it, i have tryed 3 times....

Comment by kim jessen on March 20, 2009 at 3:44pm

Halo Daniel. Greatings from denmark... It ise a' pease off cake to use a acuncronius motor for generating power to the grit, i have don some testing vith it and it ise quit easy... nau try to understand mu bad englisch:

You have to make the motor conectet in Y conection that ise the first step. 2. the engien have to be markt right.... i cant rember the grid power at youer place, bout in DK ouer grit ise 230Vac, so the 3 fase are 400Vac(hope you under stand if not ask) for getting the rigt 0 point i have to use a motor markt 230/400. the problem in dk ise that the most commen power moter ise 400/680Vac that ise bad.... nau ve have the moter... on the motor ise ther markt RPM. you have to get the motor spin 15-25% faster for induct in to the grit.... for syncronisasing(???) you let the motor start the engien then they run syncron, dont vory you vant roun out the grit the grit will controle you, fix the throtol so the engien saunds ok relaxt, chek the RPM, if the fit tho the motot marking fine, nau slovly rice thr rpm on the engien so you exide the markt RPM up to 15-25 % not more the moter vil burn... fino, thats it,.... sounds simpel it isend.... like some other said it might end out deangerus, and 30KWH ise tooooo mutch for a start out, start vith 4-7 KWH let it run a litel every day, that ise easyer to controle, at last my ider to you ise to start converting a let say 6KWH motor ore hwot ever you got laying around in to a generator, that ise easy, not that dangerus, and cheap, diferent story bout somsing like hvot i just told uoy ther ise some eqasions fore the condensators let me knov youer grid data and hwot motor you intent to youse, the i give you the valious for the capasitors.....
se my vidio it ise her on veitorygasvorks http://victorygasworks.ning.com/video/no-generator-youse-a.
Long story maybe nonsens bout it ise easy, laiter vil i come up with a, real resapy for geting to the grit on the safe and right vay, i thing vith some vidio clips...

BEST kim jessen

Comment by Radam on February 22, 2009 at 4:20pm

Running the gasifier, engine and a motor which produces 30kw would probably use around 20 tonns of wood a year. That is operating for 3 hours every working day, producing about all the electricity you use.

As far as I have dug into it, it should be somewhat straightforward. Keeping it little over its synchronous speed could be done manually for someone as handy as you are. I would prefer getting a controller though.

Comment by Eric Schrack on February 22, 2009 at 11:24am

At my family's tool and die shop we have never had 3 phase power provided by the electric company. For almost 30 years we have been producing our own. We took a 3 hp - 3 phase motor, used a 110 v motor to get the 3 phase motor up to speed, used 220 v power to keep it going, and wired it to produce 3 phase power for all of our mills, lathes, and other equipment.

Comment by Daniel on February 22, 2009 at 2:12am

Had a look at the outback grid tie inverts, the max output is 3.6 kw ……would have to run it 555 hr a month (I use around 2000 kw a month)….that is a long time to be running a gasifier with a internal combustion engine, if; I would run it 8 hr a day it would take me 69 days to produce the electric I use in a month..just not practical (need to be able to put in around 30kw to even be practical)….you could buy 9 of them for around $18,000 plus the wear and tear on dc generator (not sure they make one this big) just not practical for the average Joe (you can buy a lot of electric for $18,000)……… I can buy a 60 hp 3-phase induction motor for under $2000 and there is not really any ware and tear, no brushes……

I have a small 3-phase motor I will hook it up to an engine and see if I can make power will keep everyone posted.

Comment by Robert L Benkenstein on February 21, 2009 at 4:30pm

In Idaho we have net metering witch means that 20% of what you produce go to paying for the grid and you get paid for 80%. On feeding back to the grid you have the transformer that protects the grid so what you have to worry about is your own equipment. The dc ac inverters like tall girl said, hydro electric plant run dc generator thin invert to ac.

Comment by tallgirl on February 21, 2009 at 12:44pm

It's unlikely that the grid will be brought down -- most likely the generator will be destroyed.

The best approach to producing power for sale back to the grid is DC to AC conversion.

You'd need an "intertie" agreement with your local utility and DC to AC inverters (I use Outback Power inverters for my system). Keeping an eye on your monthly consumption helps make sure you maximize your $$$s. The utility isn't much going to care so long as you don't start making so much power that you have a negative electric bill. Even then you will likely wind up with a minimum bill for the connection to the grid.

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