Piece by piece...
Originally Posted By: turtlevette
All of OZ can be considered an electrical island. It's all relative. You're whole system is puny compared to here. If we ever got 1 hz below 60 it'd be because the zombie apocalypse. The big boys have spinning reserve, ie a GT or other plant that is connected but generating almost nothing so there is no multi minute lag.
If that's the case, then your (made up) problems with coal would be exaccerbated, not made easier.
And if your premise of spinning, unloaded GTs in readiness were true, they'd obviously be there and spinning in Oz...because out island is that much worse, isn't it ?...
...and they aren't.
and the 2Hz band that I quoted is the "must stay in and loaded range", for the grid to still be there...haven't seen a 10th of a Hz the last two years I've been looking.
Originally Posted By: turtlevette
I think you'd agree some large steam turbines do not like being in certain frequency zones below their nominal design which makes it dangerous for the turbine. We've seen cracks in shafts here when operating turbines in rough zones for too long.
Yes, thy are designed around operating frequency, they are designed to be above the first shaft critical, and below the second...the blades are designed similarly.
the 2Hz off frequency would be hard on the machines, and is the system "must stay in service" range to keep the grid up in an emergency...lifetime of the machines at 48Hz off frequency operation is months, not 250,000 hours + life managament.
Originally Posted By: turtlevette
From a ramping standpoint boilers do not like to be ramped. Too much cold feed water shocks the system.
There's not likely a power station in your country that feeds cold water to the boiler...ever heard of feedwater heating ?
economisers have been used for 150 years.
What exactly have you been working on ???
It's not anything produced post the 50s.
Originally Posted By: turtlevette
Here we operate on 5% governor droop so each unit contributes a small portion of the frequency maintenance instead of having the governor go full open. I'd check with your operators to see if that is really true. Its called zero governor droop and only used in emergency situations here.
It's used all day for frequency control, the system perturbations that occur...check with an operator if you like, or spend a half hour sitting atop the front pedestal...governor motor is constantly responding...and the MHG/EHG are behind the scenes perpetually controlling.
and 5% isn't "small", it's 3MPa or so of steam, sitting there ready to produce power.
What's the US average load ?
170GW of coal at any one time ?
That 5% amounts to 5GW of available (coal) power in the goverining margin (that's 7 big Units, spare, in the governing margin)...
You are saying that you've got 10-12GW of OCGTs sitting there ?
Nonsense.
Originally Posted By: turtlevette
You operate your system differently. I'll accept that. You don't need to keep on to prove anything.
Well what was the point of the erroneous "facts" that you threw out in your post ?
Don't want me to counter them because your stilts are shaky ?
