
Here N
s
is the number of the sampling processes; n(S) is the number of occurrences of state S;
F(S) is the index function under state S;
ˆ
P(S) is the probability of state S. To estimate the uncertainty
of the system indices with expression (14), the mean variance of the samples can be used. In such
case, the accuracy level of statistics simulation can be expressed with variance coefficient η as
indicated by expression (15).
To evaluate the service reliability of a distribution network with DG connection, we can make
the following assumptions provided that the accuracy is not compromised:
1) all elements are repairable;
2) permanent failure instead of ...