This file explains the use of the material related to the IEEE paper:

"Sensitivity-based approaches for handling discrete variables in 
optimal power flow computations."

by F. Capitanescu and L. Wehenkel

We provide the data and detailed simulation results of two systems:
a 60-bus system (a modified version of the Nordic32 system) and a 
300-bus system (the IEEE300 bus system). 

All files relative to a given system and a given OPF problem have been 
archived. For instance, the archive 60bus_MGC.zip contains the files 
related to the solution of the minimum generation cost OPF problem by 
various approaches in the 60-bus system. 

We also provide a document describing the data format of our OPF tool. 

Finally, we provide the OPF program used in these simulations, but 
without any warranty, especially if other objective functions 
are used except of those for which we provide numerical results. 
This program runs under Linux (actually we run it under Windows 
XP by using Cygwin). 
Note that all interior-point algorithm parameters have been coded 
in this version of the program in "hard". In the future we will 
provide a version where the user will have the freedom to choose 
itself appropriate values of these parameters.
You could contact Florin Capitanescu if you encounter problems in 
using this tool.

The description of the codes appearing in the data files names 
is as follows.

Files with extension ".dat" represent data files.

Files with extension ".res" represent OPF numerical results files 
(i.e. listing of the OPF run).

MPL - refers to the minimum power losses OPF problem.

MGC - refers to the minimum generation cost OPF problem.

C - refers to the continuous relaxation OPF (i.e. discrete variables 
are treated as continuous).

RO - refers to the optimal operating point provided by the OPF 
after discrete variables have been set with the round-off approach.

SMF - refers to the optimal operating point provided by the OPF 
after discrete variables have been set with the sensitivity-merit 
function (SMF) approach.

D - refers to an operating point (stemming from a power flow solution) 
after the discrete variables have been set to discrete values by some 
approach.

For instance the file 60bus_MPL_RO.dat is the optimal operating point 
(i.e. the OPF solution) of the 60-bus system for the minimum power 
losses OPF problem and after the discrete variables have been set 
with the round-off approach. The file 60bus_MPL_RO.res contains 
the convergence details of the OPF using the 60bus_MPL_RO.dat data 
file.

Also the file 60bus_MPL_D_SMF.dat is the converged operating point 
(i.e. the power flow solution) after the discrete variables have been 
set to discrete values by the SMF approach.

The file 300bus_MGC.dat contains the (non-optimized) base case data 
(which satisfies power flow equations) for the OPF problem of minimum 
generation cost for the IEEE300 system.  

NOTE: 

1) For the IEEE300 bus system we use the same base case file for both 
OPF problems (power losses and generation cost). Therefore, files 
300bus_MPL.dat and 300bus_MGC.dat are identical.

2) For the 60 bus system we use a slightly different base case. The 
file 60bus_MGC.dat is obtained from 60bus_MPL.dat after we have slightly 
modified the terminal voltage at some generators and solved the power flow.