Re: BBC article about regenerative "breaking"

In message <hb26f1$fca$1@xxxxxxxx>, at 15:30:41 on Tue, 13 Oct 2009, Alistair Gunn <palmersperry@xxxxxxxxx> remarked:
>There are lots of lumpy demands on the grid. To cope with that, there are
>certain generators that respond quickly (within seconds) to a change in
>demand. So if a train starts putting energy in that nobody wants, these
>generators will in principle just stop putting energy in. Whether there is
>currently sufficient flexible capacity in the right places I don't know,
>but it's a solvable problem.
But the energy that's being put in from fast-reacting generators like
wind turbines is essentially "free". So why go to the bother of dealing
with regen power from a braking train, when it would be so much simpler
to just keep the wind turbine "on grid".

Surely what would get "throttled" to cope with a regenerating train would
likely be a hydro plant somwhere? Thus 'saving' that water to be used at
a later point in time, when it would (potentially) displace something
coal or gas fired ...

I don't think the hydro plants either throttle on a per-second basis, or are connected to southern England with enough connectivity to balance out a regen train approaching London.
--
Roland Perry
.

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