PGCMMNT.TXT
Author: Paul Gribik at PSC-LADWP
Date:    1/31/97  12:33 PM
Priority: Normal
TO: Dariush shirmohammadi at PSC-LADWP
Subject: Here are the Congestion Management Presentations
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Dariush:
Here are three congestion management presentations that I gave to
the WEPEX parties.
The isolO_16 presentation covers why separate the markets and the
basic formulations for inter-zonal and intra-zonal OPFs
The iso12_04 presentation gives more detail and examples of
inter-zonal and intra-zonal OPF and congestion management.
The as-cong7 presentation describes the extension of inter-zonal
congestion management and related OPF to integrate ancillary
services with energy markets.
In essence, I recast their inter and intra zonal split to make a
very robust optimization for transmission capacity between zones.
I ignore many real world constraints to ensure that we get a
problem that is fairly easy to solve precisely and that will
produce decent marginal cost (price) signals. It is important to
drive to a true optimum since we will charge people based on the
marginal cost (sensitivity) info produced.
The more difficult constraints are moved to intra-zonal
congestion management. since this is cost-based (not marginal
cost based), we only have to drive to a very good solution --
sensitivity info not required. Also, the human operator can use
human judgment to improve the solution by taking into account
constraints and operation characteristics not included in the
model. we can do this again since we are not using marginal cost
info.
I hope that they are useful to you.
Paul