Increase External Load Mode of Turbine

B

Thread Starter

BOB

I'm working in a 400MW CCPP which is equipped with GT GE9FA.

Due to a change in market grid everything counts during start ups & those are really frequent since the unit is not operating continuously.

So trying to find ways to lower start-up times so that we'll be more competitive. we were thinking of trying to load GT in higher MWatts during transient period from GT synch until temperature matching & ST synch. GT is getting the unit to 25MW but even if it is selected from DCS to operate in external load & give 30 or 35 MW it doesn't follow setpoint but somehow is limited by MarkVI. How can we increase this load setpoint?

We've tried & took GT in Preselect mode, then changed setpoint to 35MW & GT followed correctly but with load oscillations due to droop speed factor!

Thanks in advance.
 
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