The example in this directory simulates the use of frequency responsive load
for regulating system frequency. To build the example, run 'make'. Input to
the command line is

1) The percentage of the load that participates. Range is [0,1]
2) An equivalent 'droop' for the participating load. This must be
   greater than zero. Values in [0.01 to 0.1] give nice results.
3) Frequency sensitivity of the sensors at the loads. This is
   in Hertz and must be greater than zero. Values in [0.001,0.01]
   give nice results.

Output from the simulation are

1) data files containing generator and bus frequencies and gnuplot
   files for loading these.
2) A data file _sys_freq.data that has two columns. The first is time
   in seconds and the second is the system frequency in Hertz. You
   can plot this in gnuplot with the command

   plot '_sys_freq.dat' using 1:2 with lines

See sim.cpp for more details.
