Synching and Paralleling a new genset to existing site

[radiowave]

Hi, I have a 1000KW unit that has not been configured yet to parallel to two smaller sets 600KW each. I need to know how to parallel and synch the larger unit to the existing two which are already in parallel.
The large set has a Woodward 2301A load share control and CDVR.
The other 2 engines have AVR but no Woodwards so not sure how they are sharing load.
Also the engines must synch with the steam turbines, 2.5MW each.

 

[waross]

Option 1:
Set all sets to 3% Droop.
Set the first unit to a no load frequency of 51.5 Hz or 61.8 Hz.
Switch the syncroscope to the incoming unit.
Match the voltages.
Adjust the frequency of the incoming unit to 0.5 Hz to 1 Hz higher than the loaded unit(s).
The 'scope should be rotating slowly clockwise. About 1 to three seconds per rotation.
Close the breaker when the 'scope is at twelve o clock and rotating clockwise.
Advance the speed setting until the incoming unit is taking its share of the load. This should correspond to a no load setting of 103% of base speed. (51.5 Hz or 61.8 Hz.)
Activate the cross compensation circuit.
Option 2:
Make sure that the Woodward 2301A has the load sharing option installed.
Install similar controls on the existing units.
Install a compatible load share control panel to control all the sets and start and synchronize them.
Option 3:
Hire an experienced expert.
Also, the expert will be able to suggest methods of sync'ing a group of generators to steam turbine generators.
A share control panel to control may facilitate synchronizing and connecting the DGs as a group.
It is possible to manually sync the DG sets to the large steam turbine sets all as a group, but it may be easier to sync them one at a time.



Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[radiowave]

Thanks Bill, there is a switchboard in the electrical room I forgot to mention. This is where the operators manually sync the other two gensets to the turbines.
They are manually synched and paralleled one by one to the turbine.
The other two smaller gensets don't use 2301A's but they are paralleled somehow. I'm told their governors may have droop settings in built -I'm not sure what % though.

 

[waross]

The simplest hardware is a droop governor and a cross compensation CT and switch.
If they are manually sync'ing they probably have droop governors. If you can imagine controlling your car's speed by holding the accelerator to the floor and switching the ignition off and on or by either taking your foot off the accelerator or putting it to the floor, that is how a governor with zero droop would act. Full on or full off.
Our little system had 5 diesel generators. We had a 5 position selector switch so that the same 'scope could be used to sync any of the sets.
To add a genset to the lineup we would have had to change the selector switch to a 6 position switch.
The cross compensation CT would be part of the generator control panel.
The AVR should have cross compensation terminals. If not, a simple resistor may be used to develop a bias voltage proportional to the reactive current.

Bill
--------------------
"Why not the best?"
Jimmy Carter