Parallelling of GTG with different ratings
Parallelling of GTG with different ratings
(OP)
Hi guys, just wanted to ask if my new gas turbine generator rated 11500kW, 6.6kV, 3phase, 50Hz, with an NGR can be paralleled with the existing GTG of 10800kW 6.6kV, 50Hz, 3phase, 50Hz also with an NGR. These gen set are use on offshore platforms.
Instrumentation, control and synchro of the GTG's are all in place. What will be the possible problems we may encounter?
Thanks for any suggestion and help you can share.
Instrumentation, control and synchro of the GTG's are all in place. What will be the possible problems we may encounter?
Thanks for any suggestion and help you can share.






RE: Parallelling of GTG with different ratings
Possible only one "problem", check level of earth fault in case of paralleling NGR and option of circualation current between generators NGR ( 3-rd harmonic current)
Of course you have check paralleling work of AVR's and governors, id all ready to this work, share of reactive and active power.
Best Regards.
Slava
RE: Parallelling of GTG with different ratings
If you have a load control panel controlling the generators it may be set in isochronous mode.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Parallelling of GTG with different ratings
Advanced electronic governors like Woodward 2301A load share & speed control unit, allows correct load sharing in isoch mode. In the other hand, in an islanded system the only way to safely control constant frequency is operating in isoch mode.
RE: Parallelling of GTG with different ratings
Thanks guys!
RE: Parallelling of GTG with different ratings
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Parallelling of GTG with different ratings
I agree that "a rock solid frequency is nice but not always necessary" but when is necessary like Airports where very sensitive equipment coexist there is not other alternative than running isochronous.
RE: Parallelling of GTG with different ratings
Bill
--------------------
"Why not the best?"
Jimmy Carter