通信光缆故障对电力网连锁故障的影响

连锁故障研究在应对突发的大面积停电方面具有重要意义,而传统连锁故障研究很少考虑信息网通信光缆对电力网连锁故障的影响。从信息网边的角度出发,在直流潮流模型下,通过建立信息网对电力网连锁故障影响模型,并以IEEE 30节点系统为例,研究了通信光缆遭受随机故障和不同信息网拓扑结构对电力网连锁故障的影响。仿真结果表明,由于信息网的引入,电力系统脆弱点增多,导致大停电的风险增加,随着信息网中通信光缆故障规模的增大,信息网对电力网连锁故障的影响强度由强变弱,直至稳定。同时,信息网网络拓扑结构对电力网连锁故障影响显著,信息网更宽的度分布增加了电力网的脆弱性,在规则网络中,信息节点的度越大,通信光缆故障对电力网连锁故障的影响越小。

Impact of Failure of Communication Optical Cable on Cascading Failures of Power Grid

Research on the cascading failures is important to dealing with blackouts, but the impact of failures of communication optical cable is seldom considered in conventional research on cascading failures in the power system. From the perspective of the edge of information network, a model for the failures of communication optical cable with an impact on the cascading failures of the power grid is built based on DC power flow model. The impact on cascading failures of the power grid with random failures of communication optical cable and different topologies of information network are studied with an IEEE 30-bus system as an example. Simulation results show that owing to the introduction of the information network, the power system is becoming increasingly vulnerable, leading to greater risk of blackouts. With the increase in failure scale of the communication optical cable in the information network, the impact strength of failures of communication optical cable on the cascading failures of the power grid changes from strong to weak till stability. Meanwhile, the influence of the topology of information network on the cascading failures of the power grid is manifest, and a broader degree distribution of information network increases the vulnerability of power grid. This shows that, in regular networks, the greater the degree of information vertex is, the weaker the impact of the failures of communication optical cable on the cascading failures of the power grid will be. This work is supported by National Natural Science Foundation of China (No. 50677047, No. 61201168) and Hubei Provincial Natural Science Foundation of China (No. 2010CDZ051).