July 18, 2000
Seattle, Washington
Attendance
17 members and visitors attended: Robert Broadwater, Sandoval Carneiro,
Jr., Roger Dugan, Jian Fu, Mingguo Hong, Bill Kersting, Ljubomir Kojovic,
Jean Mahseredjian, Juan Martinez, Tom McDermott, Hiroyuki Mori, Ilya
Roytelman, Noel Schulz, Xiaofeng Wang, Dennis Woodford (visitor), Mohammad
Vaziri Yazdi, Jun Zhu
Old Business
All those present introduced themselves and updated the address list.
Tom McDermott chaired the meeting because Mesut Baran and Anil Pahwa could
not attend. Minutes from the 1999 Summer Power Meeting in Edmonton were
approved. There was no subcommittee meeting at the 2000 Winter Power
Meeting in Singapore.
Panel Session for 2001 WPM
Five panel session topics were considered for Columbus:
- Load flow analysis and models (repeat of the 1999 T&D panel)
- Common information model
- Reliability and planning
- Economic tools and market analysis
- Design and optimization
The subcommittee decided to combine the first two into a panel on
"Load Flow and Data Models". Sandoval Carneiro and Noel Schulz
will co-chair the panel. The tentative topic list for this panel is:
- Distribution common information model
- Model selection
- Three-phase methods
- Radial test feeders
There was a discussion on the relative merits and sophistication of
line models used for transmission vs. distribution analysis. It was
pointed out that accurate line models are available in both fields.
However, confusion might arise when simpler models are used in cases where
they should not be. Topic 2 of the panel should focus on this issue for
distribution systems.
Radial Test Feeders
Bill Kersting had updated the feeder data and distributed it to some
subcommittee members before the meeting. Since then, Bill has added a
simple four-bus system for testing transformer connections. Ilya Roytelman,
Noel Schulz, and Tom McDermott have all begun solving the feeders in
different programs. The data will be finalized in time for presentation at
the 2001 Winter Power Meeting. A transactions paper will also be prepared.
The feeder data and benchmark solutions from NMSU will be posted on this
Web site.
During the discussion, several suggestions were made to provide more of
the input data:
- cable geometry and permittivity
- soil resistivity
- line and cable impedance matrices included in the results
The input feeder data includes physical details of the cables and
overhead lines, rather than impedances, because line modeling choices are
to be highlighted. Impedance matrices will be provided in the results,
however, as an aid for investigators tracking down discrepancies with the
benchmark solutions.
Data Dictionary
Roger Dugan provided an update on the Distribution System Analysis Data
Dictionary. A straw man draft was circulated for the 1999 Summer Power
Meeting. He has collected roughly a half-dozen vendor data formats. Roger
asked if anyone knew about a complementary or competing effort called
"Multispeak" (no one did).
Xiaofeng Wang and Noel Schulz are going to help Roger coalesce the
straw man draft and the vendor responses.
New Business
The planned panel sessions on DG and PQ analysis did not occur at this
meeting, due to lack of timely author response. However, some of our
panelists took part in a combined DG session on Monday afternoon, which
over 100 people attended. At the Distribution Planning/Power Quality paper session on Wednesday
morning, there were almost 50 people attending through the whole session.
Minutes prepared by
Tom McDermott
August 9, 2000
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