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1.
An enhanced cascading failure model integrating data mining technique is proposed in this paper. In order to
better simulate the process of cascading failure propagation and further analyze the relationship between failure
chains, in view of a basic framework of cascading failure described in this paper, some significant improvements in
emerging prevention and control measures, the subsequent failure search strategy as well as the statistical analysis
for the failure chains are made elaborately. Especially, a sequential pattern mining model is employed to find out
the association pertinent to the obtained failure chains. In addition, a cluster analysis model is applied to evaluate
the relationship between the intermediate data and the consequence of obtained failure chain, which can provide
the prediction in potential propagation path of cascading failure to reduce the risk of catastrophic events. Finally,
the case studies are conducted on the IEEE 10-machine-39-bus test system as benchmark to demonstrate the
validity and effectiveness of the proposed enhanced cascading failure model. Some preliminary concluding remarks
and comments are drawn. 相似文献
2.
Under frequency load shedding is an effective approach to maintain or restore the steady-state operation of the
power system when frequency accidents occur. An improved under frequency load shedding strategy based on
dynamic power flow tracking is proposed. The expression of the kinetic energy theorem in power system is derived
and combined with the power flow tracing method to analyze the relation between system energy distribution
and its frequency. The power system frequency influencing factors are then constructed and applied to find the
reasons of frequency decline and to quantify the contributions of the mechanical power of the generators, the load
power and the transmission losses for the frequency deviation. Finally, considering a variety of unbalanced power
scenarios in the system, the modified load shedding strategy is designed. Based on the results of dynamic power
flow tracing, the strategy can choose the suitable load node to control, and the defined load frequency contribution
indicator is utilized to determine the load shedding amount which each control object undertakes. The proposed
methodology is verified by the fault scenarios when the generator sets mistakenly cut off and the trip of important
tie-lines in the IEEE 39-bus system. Compared with the conventional strategies, the proposed strategy is more selective,
can reduce the blackout range, and improve the effect of stable frequency recovery 相似文献