计及级联失效的电力信息系统脆弱性评估

Vulnerability Assessment of Power Information System Considering Cascading Failures

电力信息系统对保障电网正常运行至关重要。电力信息系统发生故障会导致系统中负载的重新分配,由此引发的网络拥塞等问题可能导致新的设备或子系统故障,从而形成级联失效。将电力信息系统抽象为复杂网络,在此基础上,改进了传统的负载-容量模型使其满足电力信息系统数据流特点,同时将节点在物理世界中的分布反映在节点负载中;从拓扑结构和网络性能两方面建立了脆弱性评估指标,并给出了完整的脆弱性评估流程;最后,通过对测试系统进行仿真计算,分析了级联失效的过程和冗余系数对系统脆弱性的影响,验证了方法的有效性和合理性。

Power information systems are important for the operation of power systems. When part of the power information system fails, the loads will be redistributed. Due to network congestions, cascading failures may occur, and additional devices or sub-systems would fail. In this paper, power information system was abstracted to a complex network. The traditional load-capacity model was improved to satisfy the characteristics of power information systems. The improved model also reflects the distribution of power information system nodes. Moreover, two vulnerability indices were established from the perspective of both topological structure and network properties, and the vulnerability assessment process was proposed. Finally,cascading failure process and the impact of redundancy factor were analyzed in case study. The effectiveness and rationality of this method was verified by the results.