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Generators & Electric Motors General Discussion

Syncing two generators or sinking generators


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  #1  
Old 02-14-2010, 10:33:57 AM
James Storm James Storm is offline
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Default Syncing two generators or sinking generators

Hi all,
I have read the posts about using 2 light bulbs to run 2 power sources together.I have also read the horror stories about when you get it wrong.
Has any one tried to connect two together using lite fuses say like 5 amp under no load and then connect using main disconect and the loading. Trying to minimize damage if it goes wrong. I am thinking of using a small cord with alligator clips, small fuses and lights for the purpose. Thinking the 5 amp or smaller fuse would blow before causing and damage? This is for 2 5KW generators in my case.
Stormy
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Old 02-14-2010, 11:20:35 AM
Wayne 440 Wayne 440 is offline
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Default Re: Syncing two generators or sinking generators

99 percent of the time, paralleling two small generators is more trouble than it is worth. Without a governor/AVR retrofit (read expensive) you wil have a difficult time keeping one set from trying to pull all the load plus probably "motoring" the other.
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Old 02-14-2010, 11:57:28 AM
Jim Rankin Jim Rankin is offline
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Default Re: Syncing two generators or sinking generators

Some of the small inverter based sets can be paralleled with a special cord. I believe Honda makes some of those. They run only fast enough to make the power required and the inverter synthesizes 60 hz AC power out of whatever frequency the generator makes.

On a small set, just split your load between the two. You have to get a larger generator if one can't start something by itself. Even if you successfully paralleled them and applied a steady load, when you tried to add a load like a large motor starting, it would upset the balance of both real and reactive power and screw up things royally.

Remember in the old MASH TV show when they always seemed to be having generator problems. Most likely in real life, a lot of the problems they had were because of attempting to parallel generators which weren't equipped to do it very successfully. Basically to successfully parallel 2 or more generator, you have to control the throttle of each set (this sets the real power output of each generator and controls the frequency) and also the voltage regulator has to be accurate down to a knat's hair (this controls the reactive power flow and overall voltage).
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Old 02-14-2010, 01:39:05 PM
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Talking Re: Syncing two generators or sinking generators

Trying to sync gensets under 75 Kw is a prescription for MAGIC SMOKE. It is almost a LOCK in that regard. These engines just don't have the required governor stability that is REQUIRED for Sync Operation. Also the Genends don't have the Voltage Regulation, REQUIRED, for this to be doable. These things can be retrofit, BUT the Costs to do so are more than the larger Genset that the two units that would be replaced by. Most Powerhouse Designers don't even think about sync'ing untill you get passed 250Kw Units, and even then they don't actually run them in Sync for long, but use it to transfer the loads from one to another, for maintainance purposes. BAD Idea....
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Old 02-14-2010, 02:12:22 PM
Gunny Gunny is offline
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Default Re: Syncing two generators or sinking generators

It can be done but you will need a whole lot more equipment to do it than a couple of light bulbs.

Light bulbs can be used to indicate that they are in phase. To get them there, keep them there and then how to get them to share load requires a whole lot more equipment than what most folks could justify for (2) 5kW machines.

You would need to equip both gensets with a good electronic governor, motorized breaker or contactor, a good AVR, load share device, reverse power relays, synchromizers and sych check relays as a start.

If you want to do it on the cheap, both gensets are identical, have good droop governors and good voltage regulators and you don't mind tinkering, dead field permissive paralleling might work. Will still need reverse power relays and motorized breakers (expensive in the size you'd need).
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Old 02-14-2010, 02:56:38 PM
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Billy J Shafer Billy J Shafer is offline
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Default Re: Syncing two generators or sinking generators

Yes you can. If you have lots of money. And don't mind the magic smoke coming out.
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Old 02-22-2010, 10:21:11 PM
jas67 jas67 is offline
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Default Re: Syncing two generators or sinking generators

I think that the MEP-003 (and maybe the MEP-002) had the capability to be run in parallel with an extra kit installed.
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Old 03-03-2010, 04:45:15 PM
snowcountryfarmer snowcountryfarmer is offline
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Default Re: Syncing two generators or sinking generators

I'm really curious why you would want to parallel your generators. I think it would be a really neat project, but as others have said, without a bucket of money, or some pretty sophisticated electronics skills, not really worth it.

I wonder if you could find some woodward electronic load sharing modules for cheap on ebay? and some electric actuators to control your governors...hmmmm
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