针对网络攻击严重威胁电力系统安全运行的现状,文中对面向网络攻击的电力信息物理系统风险量化评估问题展开分析。本文从由网络攻击造成的典型停电事故出发,阐述电力信息物理系统的风险来源及传播机理。然后对比传统信息系统及电力系统...针对网络攻击严重威胁电力系统安全运行的现状,文中对面向网络攻击的电力信息物理系统风险量化评估问题展开分析。本文从由网络攻击造成的典型停电事故出发,阐述电力信息物理系统的风险来源及传播机理。然后对比传统信息系统及电力系统,对电力信息物理系统风险量化评估的特点展开讨论,并进一步基于节点风险概率、风险传播概率和物理量损失量三个方面,对电力系统风险量化计算方法进行分析总结。最后,面向网络攻击的发展方向,对未来研究提出建议和展望。In view of the current situation that cyber attacks pose a serious threat to the safe operation of power systems, this paper analyzes the quantitative risk assessment of cyber-physical power systems for cyber attacks. Based on the typical power outages caused by cyber attacks, the sources of risk and the mechanisms of risk propagation within cyber-physical power systems is elucidated. Then, compared with traditional information systems and power systems, the distinctive characteristics of risk quantification assessment for cyber-physical power systems are discussed. Furthermore, based on nodal risk probability, risk propagation probability, and physical quantity loss, the quantitative risk calculation methods for power systems is summarized. Finally, facing the development direction of network attacks, suggestions and prospects for future research are proposed.展开更多
文摘针对网络攻击严重威胁电力系统安全运行的现状,文中对面向网络攻击的电力信息物理系统风险量化评估问题展开分析。本文从由网络攻击造成的典型停电事故出发,阐述电力信息物理系统的风险来源及传播机理。然后对比传统信息系统及电力系统,对电力信息物理系统风险量化评估的特点展开讨论,并进一步基于节点风险概率、风险传播概率和物理量损失量三个方面,对电力系统风险量化计算方法进行分析总结。最后,面向网络攻击的发展方向,对未来研究提出建议和展望。In view of the current situation that cyber attacks pose a serious threat to the safe operation of power systems, this paper analyzes the quantitative risk assessment of cyber-physical power systems for cyber attacks. Based on the typical power outages caused by cyber attacks, the sources of risk and the mechanisms of risk propagation within cyber-physical power systems is elucidated. Then, compared with traditional information systems and power systems, the distinctive characteristics of risk quantification assessment for cyber-physical power systems are discussed. Furthermore, based on nodal risk probability, risk propagation probability, and physical quantity loss, the quantitative risk calculation methods for power systems is summarized. Finally, facing the development direction of network attacks, suggestions and prospects for future research are proposed.
文摘随着电网信息层和物理层的不断融通发展,信息流交互频繁,电力信息物理系统(CPS)面临巨大安全挑战,针对信息层的网络攻击传播至物理层,极易导致整个电力系统的崩溃。基于电力CPS的双层耦合结构,运用传播演化理论建立了一类新型的SIA IB RA RB网络攻击传播模型,描述了网络攻击在电力网络节点中的传播行为。运用动力学分析方法分析网络攻击对电力CPS的攻击力和影响范围,提供预判网络攻击破坏力的具体算法;运用偏秩相关系数法和三维关联偏微分方法对系统参数进行敏感度分析,研究发现电力CPS的网络结构和传播概率对网络安全性至关重要,通过2个仿真模拟验证了上述理论结果的正确性。以南方电网有限公司历次典型设计和典型造价为例,梳理了电力系统网络安全防护体系实际建设费用变化趋势,建议从3个角度对安全防护体系进行精准定位建设,在降低电力CPS造价成本的同时保证系统的安全性。研究结果可为电网防御者在信息物理协同攻击威胁下制定新的防御方案提供参考。