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Dinges
Senior Member

Joined: 04/01/2008
Location: Albania
Posts: 510

Posted: 04:07pm 04 Nov 2009

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While looking for ideas and circuitry of a simple DIY induction heater, I came upon a site where someone also showed his Ph.D. work which included designing and building a simple grid-tied inverter (550W).

http://scopeboy.com/elec/RE/appendix-inverters3_3.pdf

taken from here: http://scopeboy.com/elec/RE/

All the info to build the design seems to be present, along with the source code for the PIC16F84.

Thought it might interest the odd person here, now or in the future, as we regularly get questions about 'simple' DIY grid tied inverters. This is the first one I see that looks actually DIY-able to me.

Peter. (<-- not interested in the legal aspects of such a project)

GWatPE

Senior Member

Joined: 01/09/2006
Location: Australia
Posts: 2127

Posted: 09:12pm 04 Nov 2009

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Hi Dinges,

The complexity of this GTI does not seem to be as great as the SMA, Fronius, type units, but this unit is similar in component count to a Latronics PVE1200. The price of commercial units is continually falling, so buying one is still probably the way to go. Making your own gives a repair option if it does goes wrong. The legal aspects would not matter too much in an AC coupled OFF grid application, like I mentioned on another thread, with the cheaper, Chinese manufactured units now available on EBay.

Gordon.

become more energy aware

KarlJ

Guru

Joined: 19/05/2008
Location: Australia
Posts: 1178

Posted: 11:29am 05 Nov 2009

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A good read no less.

For us that have very little understanding of how these things work, I learnt something.
ie how to make AC out of DC.....
not that I need to.

Karl

Luck favours the well prepared

HeadsUp
Regular Member

Joined: 06/12/2009
Location: Australia
Posts: 43

Posted: 06:57am 30 Dec 2009

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I am interested in the requirements for AS 4777 compliance for grid feed in regards to anti-islanding circuitry

Does anyone have access to the scope of operation or construction , and fail safe systems for the above ?

The above is in regards to 10 - 50 kW systems of 415 V 3 phase

KarlJ

Guru

Joined: 19/05/2008
Location: Australia
Posts: 1178

Posted: 08:23am 30 Dec 2009

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The anti-islanding circuit is the same in all of them, someone had a good scheme and they all adopted it.

Only problem is if everyone has one it may not work as they will see all the other inverters as being the grid.

Apparently the algorithm works by trying to fight the grid on a regular basis and if there is no grid there, the inverter wins and shuts down, if grid wins it keeps going.

If you do a few searches you will find all you need to know.

Luck favours the well prepared

HeadsUp
Regular Member

Joined: 06/12/2009
Location: Australia
Posts: 43

Posted: 12:41am 18 Jan 2010

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pity we couldnt get a standalone anti-islanding box that we could connect to any ACME brand X inverter

that would open the doors to the zillions of cheapish ebay sourced inverters out there

GreenD88

Senior Member

Joined: 19/05/2009
Location: United States
Posts: 104

Posted: 08:14am 21 Feb 2010

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Tiny Grid Tie Inverter Unit Here's A theoretical Circuit, I don't think anyone's built this one yet.

Licensed Master Plumber / EPA 608 Universal License / 410a Safety Certified / Medical Gas Brazer/Installer

goldhunter_2

Regular Member

Joined: 10/03/2010
Location: United States
Posts: 57

Posted: 07:41pm 10 Mar 2010

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interesting reading anyway

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