Simulation parameters are listed in table 2. We assumed that
the capacity of governor with speed-droop is plus or minus 5
percent of the rating capacity of thermal generating unit and
that of LFC is plus or minus 1.5 percent of total demand (table
2). Figure 6 shows the simulation model for load fluctuation
[9]; then, Fig. 7 shows the hourly load fluctuation when the
total demand is 5000 MW. We adjusted the amplitude of
fluctuation according to total demand as in (4) [8].
σ = 0.6 P (4)