考虑信息失效影响的配电网信息物理系统安全性评估方法

A Security Evaluation Method for Cyber Physical Distribution System Considering Influence of Information Failure

由自然故障或网络攻击导致的信息失效事件会影响配电网的故障处理过程,导致配电网停电区域的扩大与停电时间的延长。为量化评估信息失效故障给配电网信息物理系统(cyber physical system,CPS)安全性造成的影响,首先建立配电网CPS安全性评估框架,明确安全性评估的内容和流程。其次,以最小化失负荷功率为目标函数构造配电网故障恢复数学模型,得到故障下的最优开关动作策略。随后考虑故障定位、隔离、恢复过程中出现的信息失效故障,分析其对故障处理业务的影响,计算信息物理组合故障下的安全性评价指标,最终得到对配电网CPS安全性影响最大的关键组合故障集与关键的电力及信息设备。基于某地62节点配电网算例的仿真结果,验证了所提方法的有效性和合理性。

Information failure events caused by natural faults or cyber attacks will affect the fault handling process of distribution network,leading to the expansion of power outage area and extension of power outage time.In order to quantify the impact of information failure on the security of the cyber physical distribution system,a CPS security evaluation framework of distribution network is firstly established,which clarifies the content and process of security evaluation.Secondly,a mathematical model is built for distribution network fault recovery with the minimized load loss power as the objective function,and the optimal switch action strategy under power failure is obtained.And then an analysis is made of the impact of information failure faults,which occur in the process of fault location,isolation and recovery,on the fault handling business,and the security evaluation indicators under the cyber-physical combination faults are calculated.Finally,the key combination faults set and the key power/information equipment which have the largest impact on the cyber physical distribution system are obtained.The simulation results based on a 62-node distribution network have verified the effectiveness and rationality of the proposed method.