In which m represents fault multiplicity, lk ,max S is the
power limits on line k l ; lk ,m−1 S and lk m S , respectively
represents the power on line k l before and after the m-tier
failures. lk ,m+1 α and lk ,m+1 β reflect the sharp degree of power
change on line k l by m-tier failures and power reserves of line
k l . We can see, fault evaluation index can fully reflect the
power changes on line k l after m-tier failures.
This paper based on these two indicators to search for
relevant events 2 A after event 1 A occurring.
P2 μ expresses the expectations of active power on the
line 2 l before the line 1 l fault. '
P2 μ expresses the expectations
of active power on the line 2 l after the line 1 l fault