Re: The Spanish Grid Drop-out - recently released information.

On 13/05/2025 3:35 am, john larkin wrote:

On Sun, 11 May 2025 12:22:11 +1000, Chris Jones
<lugnut808@spam.yahoo.com> wrote:
 

On 11/05/2025 5:04 am, john larkin wrote:
>

As solar and wind get to be dominant, micromanagement of power sources
and loads will be necessary to ensure uptime.

>
This is largely unnecessary - if the control signal that was being sent
out by the central controller to micromanage each power source was
derived from a function of the frequency, phase, voltage etc., then
rather than trying to distribute the result of this calculation to
millions of devices with low latency, it is better to distribute just
the formula (once every few years or as necessary), and run it on a
microcontroller in the inverters several times every mains cycle. They
already have more than enough processing power.

 A central (international!) controller would want to know what every
contributor was pushing into the grid, and probably see wind flow and
clouds moving around. One local transmission line could fail and take
down half of Europe. Again.

What makes you think that?
The current control system clearly isn't that well informed, and it works pretty much all the time.

I believe that there are some new regulatuions in at least one Australian
state, driven by the (fossil-fuel-stoked) fear of "too much solar
destabilising the grid", which require new home solar inverters to stop
exporting power, unless they receive continuous "permission to export"
signals from our overlords, the network operators. In other words,
rather than exporting power in the case of communications failure, it
goes into the state of "export no power" in case of communications
failure, because otherwise people might unplug their internet to export
more scary solar power if exporting power was allowed when the internet
connection fails.

This is nonsense. The Australian grid don't like having to deal with excess power being exported by roof-top solar installation, and discourage people from doing it, to the point where 40% of new roof-top solar installations in Australia include a Tesla Powerwall or an equivalent battery, and don't export anything.

This is a fairly new requirement, so not many
compliant devices are installed now, but once a few gigawatts of these
inverters are running, it will be interesting to see what happens when
there is a major internet outage on a hot summer day, and all of those
gigawatts suddenly go away. Hopefully they thought of that but I doubt it.
>
The rapid control algorithms should be distributed, and the only
low-latency communication signals they should rely upon are frequency
and voltage.

 A solar panel with an algorithm can't know about potential system
overloads. Solar and wind will have to be shed sometimes to protect
the entire system. Loads shed too. Renewable-heavy grids are fragile.

The existing system doesn't know about potential system overloads, and it works pretty much all the time. Regular grids are fragile too.
The renewable-heavy grid in South Australia was fragile, until they bought the world first grid scale battery in 2017.
https://hornsdalepowerreserve.com.au/
They promptly devoted half the battery to short term phase correction and frequency satabilisation, and it isn't fragile any more.
Carlos says that the Spanish mainland grid hasn't got any storage - no grid battery and no pumped hydro, which is a bit silly.
--
Bill sloman, Sydney