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To: meyer
Also, I should add, there was discussion about "ACE" -

- a new tool named for "Area Control Error (ACE) Frequency Real-Time Monitoring System" released this last year "designed to ensure the reliable supply of electricity" (so they say on their website) -

- on the MISO transcripts.

Judging from the MISO transcripts this tool too was not usable - there are several references to 'ACE' in the transcripts that I've yet to see mentioned in news/wire stories ... it's my contention, again, that due to network congestion that day data was not able to make it from point A to point B either at all or in a timely manner in order for these network stability and 'security' (not physical security in the usual sense but rather 'reliability and stability of the grid') tools/programs to function correctly and in a timely manner.

ACE, it appears, is centrally hosted and operators access info as needed - references on the transcript indicate trouble 'getting in'.

I need to go back into the transcripts and note where, what time, what context and exactly wheat the complaints were in accessing ACE ...

13 posted on 10/02/2003 9:56:40 PM PDT by _Jim (Resources for Understanding the Blackout of 2003 - www.pserc.wisc.edu/Resources.htm)
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To: _Jim
Also, I should add, there was discussion about "ACE" - - a new tool named for "Area Control Error (ACE) Frequency Real-Time Monitoring System" released this last year "designed to ensure the reliable supply of electricity" (so they say on their website) - - on the MISO transcripts.

Actually, ACE isn't really new - its essentially an equation that measures power flows into and out of a control area, balances them against area load, and applies a frequency component (60 cycles per second) and a mathematical constant that adjusts for the response rate of that individual control area's internal generation. It is a tool for each control area that allows them to maintain their generation to load balance.

Judging from the MISO transcripts this tool too was not usable - there are several references to 'ACE' in the transcripts that I've yet to see mentioned in news/wire stories ... it's my contention, again, that due to network congestion that day data was not able to make it from point A to point B either at all or in a timely manner in order for these network stability and 'security' (not physical security in the usual sense but rather 'reliability and stability of the grid') tools/programs to function correctly and in a timely manner.

Long before MISO, each utility took care of its own ACE. Today, it is still done that way, though MISO was possibly able to monitor the ACE of each utility control area within its region. I'll have to read some of the transcripts - while it isn't essential for MISO to view the ACE of each entity within, there still needs to be an ACE for each separate control area, and a record of how each utility maintained their ACE. Ours was once a mechanical chart recorder, but that has since been replaced by computer. There's supposed to be a backup scheme supplying all the necessary data to maintain control area integrity.

ACE, it appears, is centrally hosted and operators access info as needed - references on the transcript indicate trouble 'getting in'.

ACE is hosted centrally to each control area. I suspect that MISO wasn't able to read the ACE of one or more of the utilities in its area, probably due to computer problems. For example, if FirstEnergy's EMS computer was locked up, it was probably unable to supply ACE indication to its own operation center, let alone that of MISO.

BTW, I'm going out on a limb here by saying that MISO can or is even entitled to look at ACE for each utility - I'd probably better read some more transcript before I get too far down that road. Rules are different up there now.

I need to go back into the transcripts and note where, what time, what context and exactly wheat the complaints were in accessing ACE ...

Me too! Context can tell a pretty good story. Thanks.

BTW, thanks for the freepmail the other day. It is appreciated.

14 posted on 10/03/2003 1:28:01 PM PDT by meyer
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