恶意攻击下的电力耦合网络风险传播模型研究

Risk Propagation Model of Power Coupled Networks Under Malicious Attack

电网可视为信息域、物理域相互耦合的信息物理系统(cyber-physicalsystem,CPS),存在严重的安全风险。针对信息域的恶意攻击极有可能传播至物理域,导致停电事故的问题,文章首先分析电网CPS耦合结构框架,并基于此研究电网风险跨域传播的基本形式,提出一种基于复杂网络的电网风险传播模型,并给出风险评估指标。最后通过构建IEEE-118总线系统为物理域的耦合电网场景,仿真模拟该场景下遭受恶意攻击的风险传播模型,并讨论风险扩散率、初始攻击点等因素对风险传播的影响。文章核心贡献是基于真实攻击场景构建一类电网CPS系统风险传播扩散及系统存活性评估通用模型,为宏观上控制电网安全风险的扩散提供有效的探索。

The power grid can be regarded as a Cyber-physical System(CPS)with the information and the physical domains coupled together and interacting with each other.Therefore serious security risks exist and malicious attacks against information security may be highly propagate to the physical domain and cause power cut.This paper first analyzes the CPS coupling structure framework of the power grid,and then studies the basic form of risk propagation between the domains.On this basis,a risk propagation model based on such complex networks is established,and the risk assessment indicators are proposed as well.Finally,a power grid simulation scenario is constructed with the IEEE-118 bus system as the physical domain.Through a simulation of the risk propagation model in this scenario,the effects of the risk diffusion rate and the initial attack point on risk propagation are analyzed.The key contribution of this paper is to build a general model for risk propagation and survivability evaluation based on real attack scenarios of grid CPS system,which will provide an effective exploration for macroscopically controlling the spread of grid security risks.