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From: Arild Jensen (no email)
Date: Fri Feb 01 2002 - 04:42:57 EST
At 11:43 PM 01/31/2002 EST, wrote:
>This is not so according to an engineer I meet at a power plant in Puerto
>Rico many years ago.
<<<snip>>>
>A power company alternator locks into the grid frequncy. If the speed of
the
>alternator droops in the slightest it acts like a motor and the power line
>keeps it's speed up. If one tries to spin it faster, it tries to push
>against an almost infinite load. Normally the alternator pushes at it's
>rated output and his held there by regulators.
REPLY
Sounds reasonable for a generator driven by a combustion engine.
Hydro powered units have a control valve in the penstocks to prevent over
revving the rotor.
Ther is enough power in big rivers that they can push the frequency up over
the grid.
And of course, each station can be taken off grid and run as an island.
We had a bit of fun in the North East back in '65 with that bit of
technical foible.
That in turn led to the development of SCADA systems for continental wide
control systems covering multiple generators in various utilities.
Cheers
Arild
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