On Sat, Mar 14, 2015 at 09:09:12PM -0400, Stewart C. Russell wrote: > Hmm, though that’s reported through a very ‘lolwindpower’ filter. > Perhaps a more balanced summary is > http://www.euractiv.com/energy/german-energy-giant-blamed-power-failure/article-161312, > which describes the situation as:
Yeah that is actually not a very good article on it. The one I originally read was in a magazine for power companies, which was much more detailed. > 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. > > 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. > > 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. > > 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. It certainly was a number of things done wrong. Hopefully they have learned something from it. > The main report is as interesting as any network failure postmortem > could ever be: > https://www.entsoe.eu/fileadmin/user_upload/_library/publications/ce/otherreports/Final-Report-20070130.pdf That is much better than the link I found first, which had a very serious bias problem. -- Len Sorensen --- Talk Mailing List [email protected] http://gtalug.org/mailman/listinfo/talk
