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<div class="moz-cite-prefix">On 2015-03-14 07:37 PM, Lennart
Sorensen wrote:<br>
</div>
<blockquote cite="mid:20150314233710.GJ25509@csclub.uwaterloo.ca"
type="cite">
<pre wrap="">If interested, read this:
<a class="moz-txt-link-freetext" href="http://nuclearpoweryesplease.org/blog/2008/12/13/the-day-wind-power-nearly-blew-out-europe/">http://nuclearpoweryesplease.org/blog/2008/12/13/the-day-wind-power-nearly-blew-out-europe/</a></pre>
</blockquote>
<br>
<div style="" class="markdown-here-wrapper"
data-md-url="Thunderbird">
<p style="margin: 1.2em 0px ! important;">Hmm, though that’s
reported through a very ‘lolwindpower’ filter. Perhaps a more
balanced summary is <a
href="http://www.euractiv.com/energy/german-energy-giant-blamed-power-failure/article-161312">http://www.euractiv.com/energy/german-energy-giant-blamed-power-failure/article-161312</a>,
which describes the situation as:</p>
<p style="margin: 1.2em 0px ! important;">1) E.ON Netz has a
request to de-energize a major power line at a certain time to
let an unusually large ship pass underneath. The grid operator
does a simplistic calculation to show that it’s okay if all
contingency transmission is available. Neighbouring transmission
authorities are alerted, as is normal procedure.</p>
<p style="margin: 1.2em 0px ! important;">2) The ship is delayed,
and so is the downtime. E.ON Netz considers that the new
proposed time will be better for them, so without any further
analysis or consultation with neighbouring transmission
authorities, goes ahead with the delayed downtime. </p>
<p style="margin: 1.2em 0px ! important;">3) The other
transmission authorities see large frequency instabilities, and
try to get E.ON Netz to restore the de-energized line. They
can’t do this, so they call upon a contingency transmission
station to switch the load. The TX station (rather aptly named
Borken) is under maintenance, so the bridging/switching fails.</p>
<p style="margin: 1.2em 0px ! important;">4) In Germany, most wind
power facilities are ‘must run’, so on a windy night their
output ramps up. This seems more of a failure of grid protection
and control (P&C) to signal the wind facilities to curtail
them off in an abnormal grid situation. The ENTSO-E report
further castigates E.ON Netz for failing to require suitable
P&C on wind facilities in their area.</p>
<p style="margin: 1.2em 0px ! important;">The main report is as
interesting as any network failure postmortem could ever be: <a
href="https://www.entsoe.eu/fileadmin/user_upload/_library/publications/ce/otherreports/Final-Report-20070130.pdf">https://www.entsoe.eu/fileadmin/user_upload/_library/publications/ce/otherreports/Final-Report-20070130.pdf</a></p>
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<br>
cheers,<br>
Stewart<br>
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