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Forum Index : Electronics : grid-tied

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dwyer
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Joined: 19/09/2005
Location: Australia
Posts: 574
Posted: 11:22am 30 Mar 2019
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Can a 28kw 3ph generator be used to supply a grid-tied 7.5kw Inverter's signal voltage?
by borrow single phase from 28kw generator while other 3 ph power use in my workshop.as i am trying to work out the best way to go
 
Warpspeed
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Joined: 09/08/2007
Location: Australia
Posts: 4406
Posted: 08:22pm 30 Mar 2019
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Don't know the answer to that Dwyer, but most grid tie inverters take an awful long time to synchronize themselves up to the grid.

If your 28Kw generator moves around in frequency, even very slightly, the grid tie might have a heart attack and disconnect.

Its a very different thing locking to a crystal controlled inverter or the grid, and locking to something with a mechanical governor where the load and speed are constantly fluctuating.
Cheers,  Tony.
 
dwyer
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Joined: 19/09/2005
Location: Australia
Posts: 574
Posted: 02:01am 31 Mar 2019
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Thank for your answer as you are right as throught that before however sometime ago i saw two honda generator 240 volt Ac running together as double up the wattage,as belive has electronic freguency controller built in.
 
Warpspeed
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Joined: 09/08/2007
Location: Australia
Posts: 4406
Posted: 02:56am 31 Mar 2019
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These days, some of the smaller generators have internal frequency locked inverters, which is rather nice.

I rather gather though, that a 28Kva three phase machine is going to be direct driven and controlled by a mechanical speed governor. That is going to change speed slightly as the load changes and that is going to be a big problem.
Cheers,  Tony.
 
noneyabussiness
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Joined: 31/07/2017
Location: Australia
Posts: 513
Posted: 10:13am 31 Mar 2019
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AU $64.47 16%OFF | Aiyima 2000W Modified Sine Wave to Pure Sine Wave Inveter Board Driver EGS002 AC16VDC380V to AC220V Driver Module EG8010+IR2110

https://s.click.aliexpress.com/e/cMuDJzhO

Rectify the 3 phase into something like this, for your single phase work. Just make sure the max voltage is suitable.
I think it works !!
 
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