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From: Bill Sloman <bill.sloman@ieee.org>
Newsgroups: sci.electronics.design
Subject: Re: Grand Apagon - Electricity (not) in Spain
Date: Thu, 1 May 2025 23:37:22 +1000
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On 30/04/2025 7:59 pm, Liz Tuddenham wrote:
> Bill Sloman <bill.sloman@ieee.org> wrote:
> 
>> ... pumped hydro storage has the spinning
>> turbines, but grid scale batteries have invereters, which can reacta lot
>> faster than any spinning turbine,
> 
> I thought the stabilising effect of a spinning turbine was because it
> *didn't* react quickly.
> 
> The grid frequency begins to fall so energy from the moving parts is
> converted to electrical power which is fed into the grid to increase.
> the frequency.  This results in a loss of stored mechanical energy which
> causes the turbine to begin slowing down - which is detected by the
> control system and used to feed more water/gas/steam into the turbine so
> its speed is returned to normal.
> 
> The interface between the stored mechanical energy and the electrical
> energy demand has an almost instant response and is inherently stable
> without needing elaborate control algorithms.

But it isn't actually doing anything. Stabilising the frequency is all 
about feeding in more mechanical energy to compensate for the extra load.

You can feed in electrical energy from a battery quite a lot faster, and 
get a correspondingly better result, if you've got the right elaborate 
control algorithm.

-- 
Bill Sloman, Sydney