Fig. 12 shows the number of cases where no cascading
takes place, but load shedding occurs as a result of isolation
of a load bus. It can be seen that 86% (1918) of the
no-cascading cases (2225) result in load curtailment. It can
also be concluded that only 307 cases (2.1%) of the 14 468
critical overloads do not have an impact on system integrity,
i.e., the cascading is prevented without operator intervention
or customer disconnection. Fig. 13 indicates the number of
no-cascade and load shedding cases in p.u. per load level,
using 2225 and 1918 as base, respectively. As in Fig. 11, the
number of load shedding cases follows almost proportionally
the number of no-cascade cases.
Fig. 12 shows the number of cases where no cascading
takes place, but load shedding occurs as a result of isolation
of a load bus. It can be seen that 86% (1918) of the
no-cascading cases (2225) result in load curtailment. It can
also be concluded that only 307 cases (2.1%) of the 14 468
critical overloads do not have an impact on system integrity,
i.e., the cascading is prevented without operator intervention
or customer disconnection. Fig. 13 indicates the number of
no-cascade and load shedding cases in p.u. per load level,
using 2225 and 1918 as base, respectively. As in Fig. 11, the
number of load shedding cases follows almost proportionally
the number of no-cascade cases.
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