Path: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail
From: Don Y <blockedofcourse@foo.invalid>
Newsgroups: sci.electronics.design
Subject: Re: The Spanish Grid Drop-out - recently released information.
Date: Thu, 15 May 2025 06:50:08 -0700
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On 5/15/2025 6:18 AM, Martin Brown wrote:
> On 15/05/2025 13:43, Jeroen Belleman wrote:
>> On 5/14/25 23:35, Don Y wrote:
>>> On 5/14/2025 7:16 AM, Glen Walpert wrote:
>>>>
>>>> SCADA is used to monitor and control the grid, where control is done in
>>>> real time by adjusting the set points for real and reactive power at all
>>>> controlled power sources.  A small percentage of sources being
>>>> inaccessible degrades control by an insignificant amount.
> 
> I'll believe it is used to monitor the parameters at key locations in 
> "realtime", update set points and try to reset tripped breakers.

The 'S' in SCADA -- SUPERVISORY.  Like deciding how fas the subway
car will travel but not actually commutating the current in the motor.
You want local control that reports status (Data Acquisition)
and accepts control (Supervisory Control) from a higher level
functionary.

> Indeed. And smaller generation systems can just get crushed like flies if they 
> try to stop a rampaging elephant as big GW systems drop offline.
> 
> If the system did fail due to local over voltage excursions somewhere and then 
> failed to become stable again after a few suppliers dropped out then their 
> network stability analysis must be appallingly bad.

The problem is all of the distributed "residential" solar rivals
"big GW systems".  E.g., we have ~10GW of total solar, here -- but,
of that, 300,000 individual residential systems in the 5KW (avg)
power rating.  So, 1.5GW whose location is varied and diverse
BUT whose control is *likely* mandated by regulations/specifications
created when solar was intended to be "the dog's tail" -- tracking
an otherwise stable grid.

And, if a residential cogenerator goes offline, the residence's LOAD
is still there, no longer being supported by that "local" generation.