A NEW APPROACH TO DYNAMIC CONTINGENCY SELECTION
Resource
IEEE Transactions on Power Systems, Vol. 5, No. 4, November 1990
Journal
IEEE Transactions on Power Systems
Journal Volume
Vol. 5
Journal Issue
November 1990
Pages
-
Date Issued
1990-11
Date
1990-11
Author(s)
Chang, Chug-Liang
Hsu, Yan-Yih
DOI
246246/200611150121126
Abstract
Contingency selection is important for the security analysis of
a large scale power system since it can reduce the required computational
effort by ranking the various outage events according to their
severities. Among the three aspects of power system security, i.e.,
transient security, dynamic security, and steady-state security,
contingency selection for dynamic security assessment is of concern
in this paper. The proposed method is to use an iterative method to
compute the eigenvalues of the system under outage conditions. The
initial values for the iterative procedure are the eigenvalues for the
normal operating condition (base case eigenvalues). To reduce the
computational burden, the eigenvalues of the system under outage
conditions from the first iteration are employed for contingency
ranking. From the results obtained from the study on Taiwan power
system, it is concluded that contingency ranking using the eigenvalues
from the first iteration is both accurate and efficient. It is also found
that only the eigenvalues for the worst-damped mode must be
considered in contingency ranking. To further improve the efficiency
of the proposed method, results obtained from the first iteration of
the fast decoupled load flow (FDLF) are also used to model the
operating conditions after contingencies. Again, it is observed that
satisfactory dynamic contingency selection can be achieved by using
the first iteration of FDLF with much less computational effort
than that required by full AC power flow. It is thus concluded that
accurate dynamic contingency selection can be performed efficiently
by first computing the operating conditions after contingencies
using the first iteration of FDLF and then calculating the eigenvalues
for the worst-damped mode by using the first iteration of eigenvalue
computations.
Subjects
contingency selection
security analysis
dynamic security
assessment
assessment
Publisher
Taipei:National Taiwan University DEPT ELECT ENGN
Type
journal article
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