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Analysis of robustness of urban bus network

Chinese Physics B 2016年第2期25卷 1-12页

作者：任涛王一帆刘苗苗徐艳杰 Software College Northeastern University

In this paper, the invulnerability and cascade failures are discussed for the urban bus network. Firstly, three static models（bus stop network, bus transfer network, and bus line network） are used to analyse the structure and invulnerability of urban bus network in order to understand the features of bus network comprehensively. Secondly, a new way is proposed to study the invulnerability of urban bus network by modelling two layered networks, i.e., the bus stop-line network and the bus line-transfer network and then the interactions between different models are analysed. Finally, by modelling a new layered network which can reflect the dynamic passenger flows, the cascade failures are discussed. Then a new load redistribution method is proposed to study the robustness of dynamic traffic. In this paper, the bus network of Shenyang City which is one of the biggest cities in China, is taken as a simulation example. In addition, some suggestions are given to improve the urban bus network and provide emergency strategies when traffic congestion occurs according to the numerical simulation results.

关键词： complex network urban bus network layered network invulnerability cascade failures

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Blackout Model Based on OPF and its Self-organized Criticality

Blackout Model Based on OPF and its Self-organized Criticali...

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第25届中国控制会议

作者： Mei Shcngwei,Yadana, Weng Xiaofeng, Xue Ancheng State Key Lab of Power Systems, Dept, of Electrical Engineering, Tsinghua University, Beijing 100084, China

＜正＞Based on the essence of self-organized criticality and optimal power flow（OPF）, this paper develops a model to capture the cascading failures and blackouts in power systems, which avoids some shortcomings of existent blackout models. The proposed model contains two dynamics, one is the fast dynamics which simulates the serial blackouts in power system, and the other is the slow dynamics which reflects the growth of the power system. Simulations in IEEE-30 bus system with the proposed model show that, the processing of the cascading and blackout can be captured by the fast dynamics, together with the self-organized criticality property of fast dynamic respect to the micro-scale. Besides, the macro-scale of self-organized criticality of power system can be revealed from the viewpoint of total load demand vs. the total network transfer capability. Furthermore, improving the transmission ability of network could effectively prevent blackout and reduce its risk.

关键词： Blackout model cascade failures Optimal Power Flow Blackout distribution Self-Organized Criticality

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