Synchronization of Synewave Inverters

What is the purpose for inverters to be tied together?

I might want to make available 14kw on the same circuit. and I only have two 7kw units.

GF

What do you mean by "seamless connection of inverters to the grid"?

You need to synchronise the gate command for both inverters. You may try to make them work as one big invertor, commanded by the same circuit. then you can be sure they are synchronised.

Connecting them to the grid is a big problem. What do you want to do...do you want to inject power into the grid? Because if so you have to limmit the current given by the invertors for not to burn them. The problem is that when you connect them to the grid, the grid will take as much current as it needs to ballance the power need. You don't have to let this happen because the current taken by the grid may be so big that the inverters will fire up. For the grid connection you need a current limiter. If you don't plan on selling power you may not want to connect them to the grid. Also in the case of grid connection there is some easy sort of a problem, and this is the synchronisation with the grid, which is far more simple than in the alternator's case. All you have to do is to feed the command circuit with voltage directly from the grid...and in this case the transistors will work at the grid's frequency.

good luck

Nikolay.

The reason for this question was stimulated by the idea that the storage of electricity could be improved.

For instance: the price of electricity can sometimes be reduced by

consumption during off peak hours. This might some times entail the use of night

storage heaters etc.

Turning an inverter into a sort of sophisticated battery charger where power can flow either way, might have commercial applications.

The circuit design of a quality sine wave inverter is probably a one way street.

Some simpler types use trigger windings in the output transformer to fire the solid state switches controlling the DC input to the output transformer. There for, applying AC to the output transformer could turn on these gate controls which could be unipolar. I just wondered if any one else had thoughts along these lines?

GF

I personally feel (I could be wrong) that you could end up with two broken inverters....

Theoretically, and assuming they are identical, you have to disengage the oscillator of one and slave it to the other.....make sure you have a fuse in circuit when you joint them, just in case.....hopefully a fast blow fuse.....

My best advice is to go and buy a small generator......