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Anyone ever see an AC power supply that accepts and regulates two separate input sources? We're looking for something around the 5kW range.
We're trying to parallel the output of an inverter and a generator to drive an AC pulsed power load. We've looked at generator support features on inverters, but after trying a few, we've found that they're too slow and/or too unstable at balancing the load. We have no control over the generator so we can't really synchronize them internally.
Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
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Posts: 874
Hi Maverik "Ringmains", used to chain transformer together.
Sulimen the problem with a grid-tie, is they will need a source that is more powerful to lock too(not sure the value above), if you go the grid-tie get one with a voltage ride-through , so if you loss the source it will keep producing. Second hand info, but a renewable forum talked about chaining gridties and there was alot of trouble , fried inverters and what not.
Sulaiman, we have tried 3 different types of grid-tie inverters (using their generator support features) for our application, but all 3 have had different issues that prevented us from using them. One was not able to accept any deviation outside of UL, which was impossible for us to stay within considering we were intentionally stressing the generator. One was very slow at joining the two sources (took about 2.5 seconds to balance sources). The last one was just straight out crap at balancing the power. It couldn't ever find a stable state for the two sources to exist in.
Andy, that's very interesting! I haven't heard about ring mains until now, but what I'm finding by google searches is that it seems to be a way to split a load up in order to use smaller conductor wires than would typically be used. I'm not sure how I would be able to combine, balance, and regulate two AC sources by this method.
Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874
The idea I was type of meaning was have a three phase transformer with the primary three single phase sources wired in delta, with low voltage ride through the load if it sags will have to sag on all three below say 200volt for 240volt rms, with the transformer if all things are identical should be balanced. The thing can be used to chain multiple grid ties together.
Ask the local lines company, they might supply it, plus have some options.
Edit, 1 of them will have to Island abilty, or be feed I think from the secondary of the transformer, but I would look for 10-30kw range of inverters, is overkill in kw but they are designed to put alot of juice in, and are not likely to just stop.
The 2.5 seconds is not UL rated, that is the max cut off time they require to WOF, are you thinking about connecting this to the grid, or a standalone island.
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Dual Source AC Power Supply?
