On modeling and secure control of cyber-physical systems with attacks/faults changing system dynamics: An average dwell-time approach
On modeling and secure control of cyber-physical systems with attacks/faults changing system dynamics: An average dwell-time approach
复制标题
关于具有改变系统动态的攻击/故障的网络物理系统的建模和安全控制：平均停留时间方法
DOI：
10.1002/rnc.4675
复制
发表时间：
2019
影响因子：
3.9
通讯作者：
Dong Jiuxiang
中科院分区：
文献类型：
--
作者：
Huang Xin;Dong Jiuxiang
本文研究了网络物理系统的安全控制问题。首先提出了一种新的建模框架，即将具有动态变化的攻击/故障的网络物理系统建模为切换系统，其中子系统之间的切换由攻击者生成但防御者未知的规则触发。基于一种结合攻击频率和持续时间性质的平均驻留时间方法，在所设计的切换控制器下，给出了子系统活动区间(即攻击模式和健康模式)的Lyapunov函数的收敛条件。然而，下一步，未知规则导致候选控制器和系统模式之间的异步切换问题。结果，导致系统性能在异步区间内劣化(例如，在系统状态轨迹中发生较大的颤振)。为了解决这一困难，提出了一种新的基于给定性能的开关律，并证明了通过减少开关律中的可调参数来缩短异步间隔。算例验证了该方法的有效性。
The problem of secure control in cyber‐physical systems is considered in this work. A new modeling framework is first introduced, ie, cyber‐physical systems with attacks/faults changing system dynamics is modeled as a switched system, where the switching among subsystems is triggered by a rule generated by attackers but unknown for defenders. Based on an average dwell‐time approach incorporated by the attack frequency and duration properties, a convergence condition of the Lyapunov function on active intervals of subsystems (ie, the attack and healthy modes), under the developed switched controller, is given. Next, the unknown rule, however, leads to the asynchronous switching problem between the candidate controllers and system modes. As a result, degradation of the system performance (eg, a large chatter occurred in the system state trajectories) in the asynchronous intervals is caused. To address the difficulty, a novel switching law based on a prescribed performance is proposed, and it is shown that the asynchronous intervals are shortened by reducing adjustable parameters in the switching law. An illustrative example verifies the effectiveness of the proposed method.