https://modelreduction.org/morwiki/index.php?action=history&feed=atom&title=Talk%3APower_system_examples 2026-04-13T03:54:56Z Revision history for this page on the wiki MediaWiki 1.43.6 https://modelreduction.org/morwiki/index.php?title=Talk:Power_system_examples&diff=3586&oldid=prev 2022-09-01T15:02:22Z

<p>comment about zero D terms</p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 15:02, 1 September 2022</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Juba5723 is actually singular (not just numerically singular).  The rest appear to have really bad condition numbers; unclear whether they are singular in real life, or just numerically very sensitive.  As they are often used to test algorithms designed for stable systems, we should add alternative shifted problems.  See also https://morwiki.mpi-magdeburg.mpg.de/morwiki/index.php/Power_system_examples -- K. Lund + J. Saak</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Juba5723 is actually singular (not just numerically singular).  The rest appear to have really bad condition numbers; unclear whether they are singular in real life, or just numerically very sensitive.  As they are often used to test algorithms designed for stable systems, we should add alternative shifted problems.  See also https://morwiki.mpi-magdeburg.mpg.de/morwiki/index.php/Power_system_examples -- K. Lund + J. Saak</div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Many of the power systems have exactly 0 D terms that are stored as empty sparse structures.  For the benchmarking tool and database, these have been deleted, and the systems are marked as lacking a D component. -- K. Lund</ins></div></td></tr> </table>

Lund https://modelreduction.org/morwiki/index.php?title=Talk:Power_system_examples&diff=3569&oldid=prev 2022-08-31T15:56:25Z

<p>add notes about potential instability</p> <p><b>New page</b></p><div>Juba5723 is actually singular (not just numerically singular). The rest appear to have really bad condition numbers; unclear whether they are singular in real life, or just numerically very sensitive. As they are often used to test algorithms designed for stable systems, we should add alternative shifted problems. See also https://morwiki.mpi-magdeburg.mpg.de/morwiki/index.php/Power_system_examples -- K. Lund + J. Saak</div>

Lund