Parallel Running of Two Generators

ONLY Governor Designer WOODWARD should answer this Q.

If the governors are electronic equivalents of UG-88 mechanical governors with adjustable droop, set one (the "master") to zero droop (isochronous operation), and set the other for a small amount of droop, maybe 2%. The amount of droop should be a function of your MINIMUM load so the secondary generator droops first to isochronous frequency under minimum load. The master will then pick up increases in load, while the droop machne then delivers constant power to the bus.

It will be necessary to connect the two generators with a bank of light bulbs or synchronscope to get a phase match before closing the breaker between the two. you should have some load, at least light load on the droop machine at that time. You may need to control throttling of the secondary machine during this operation to maintain synchronous speed during breaker closing. Since the primary machine is set up for isochronous operation, you do not need to be concerned with it during breaker closing. Once the breaker between the two is closed, set your load to the normal extent you want one machine to carry, and adjust the droop on the secondary machine to support the load at 50 or 60 Hz, with a small amount of the load carried by the isochronous machine for frequency stabilization purposes. As you add load, the isochronous machine will load up more and more, since the droop machine has taken the burden of the base load.

Hope this helps. BernieK

.....and if he does not synchronize in the proper manner, with the correct equipment, fully tested that it is correctly tested, then he will have two very large pieces of kit trying to act like (H)airy-planes.........at best at least one of them will be severely damaged and hopefully nobody gets killed!!!.....

If you are not fully informed about running two AC (you did not mention as to whether it was AC or DC Generation!) Generators in parallel, then leave the idea completely alone!! A little knowledge is very, very dangerous......

Running DC Generators in parallel is relatively simple in comparison.....

Contact Woodward and buy a load sharing governor control. You probably have an EG3P or EG6P actuator on your engines (the component physically mounted to the engine that pulls the fuel racks with a lever and linkage), with a 2301 governor speed controller 'box' inside the control panel or switchgear.

It is a simple matter to change the 'box' to a 2301 A Load Sharing governor control (about 15 cm longer than the 2301). The 2301A LS box has connections for 3 Current transformers and also potential transformers to monitor 3 phases of current and voltage and also has a set of "Parallel" lines that you connect to the other 2301 A LS box via auxiliary dry contacts in the individual breaker. So when you bring up unit one, close its breaker to the bus, the 2301 A LS is sensing current, voltage and is attempting to communicate with the other 2301 A LS box with the parallel lines via the aux contacts of the breaker on unit two that is open (not running yet). Then you start unit two, parallel it to unit one (if you know how; if you don't know how, don't try it), then the aux contacts can communicate the parallel lines and 2 boards are talking to each other. They will maintain proper isochronous bus load sharing even if the units are different sizes. There is some set up before you connect two different size machines, but this is explained in the 2301 A Load Sharing board box, available on WW's web site. WW's' web site is informative and easy to use; downloads very easy also. For voltage regulation 'amps' sharing you need a cross current compensation capable voltage regulator like a Basler SR or SSR series, also found on the Balser web site. Then you install a 4th CT (the CCC-CT) on phase B and the VARs will share between machine. If you DON"T totally understand electrical engineering concepts do not install these things without professional help as a simple thing like opening the secondary lines of an active CT will build millions of volts in a few seconds and it may blow up in your face.

normally both generators should have same settings,for electronics engines 0% is recomended