考虑网络攻击因素的电网信息物理系统业务可靠性分析

Reliability Analysis of Business in Grid Cyber Physical System Considering the Factors of Cyber Attacks

电网信息物理系统(grid cyber physical system,GCPS)的主要特征是信息空间和电力空间的深度融合与交互影响。针对智能电网广域实时保护控制业务,首先研究了信息业务对物理系统可靠性影响的表征方式,建立信息设备关联的业务可靠性模型。在此基础上,引入设备可靠性因子,提出考虑攻击因素的信息设备可靠性评估指标,并给出了结合层次分析法(analytic hierarchy process,AHP)和贝叶斯网络的业务可靠性量化评估方法。通过算例研究,确定了考虑攻击因素的情况下系统的薄弱环节,并分析不同冗余程度的信息系统对业务可靠性的影响,并且与已有方法进行对比,验证了所提方法的可行性和合理性。

The deep integration and interaction between cyber space and power space is the main feature of grid cyber physical system （GCPS）. According to the wide-area real-time protection and control business in smart grid, this paper firstly studies the way of the impacts of information business on the reliability of physical system, and establishes the model of business reliability associated with information equipment. On this basis, this paper introduces the reliability factor of equipment, proposes the reliability evaluation indexes for information equipment considering cyber attack, and presents a quantitative evaluation method of business reliability with combining analytic hierarchy process （AHP） and Bayesian network. Finally, through the case study, this paper identifies the weak link of the information system considering cyber attack and analyses the impact of information systems with different levels of redundancy on business reliability. Meanwhile, compared with the existing method, the result verifies the feasibility and rationality of the proposed method.