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Zhang F.C.,North China Electrical Power University | Huang J.D.,North China Electrical Power University | Sun X.,East Inner Mongolia Electrical Power CO. | Zhou Q.J.,Being Join Bright Digital Power Technology CO.
Applied Mechanics and Materials | Year: 2013

In order to prevent large scope blackouts, the paper has established a model of power system cascading failures from the perspective of risk.Taking both the load of branch and the power flow changes into account, the model defines the probability of branch outage which can reflect the real-time operating condition. The consequences severity of cascading failure is measured by bus low voltage, power line overload level and the amount of isolated loads. In the process of searching fault link, the paper uses the structure transmission importance of branch to determine the next breaking branch, which can speed the search of the cascading failure mode. The simulation of the IEEE 39-node system shows the effectiveness of the method. © (2013) Trans Tech Publications, Switzerland.


Wang Z.,North China Electrical Power University | Sheng S.Q.,North China Electrical Power University | Zhou Q.J.,Being Join Bright Digital Power Technology Co.
Applied Mechanics and Materials | Year: 2013

For substation locating and sizing in the distribution network, the cost of land and geographic information should be considered. A new algorithm based on cultural differential evolution algorithm (CDEA) considering geographic information factor is presented. Based on the improved technique for order preference by similarity to ideal solution (ITOPSIS), geographic information factor model is set up. CDEA is proposed by designing three kinds of knowledge in belief space to guide evolution. The new algorithm overcomes the premature phenomenon of differential evolution algorithm and improves significantly ability of global optimization. Finally the case proves that the proposed model and method is correct, having certain practical value. © (2013) Trans Tech Publications, Switzerland.

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