网络攻击下信息物理融合电力系统的弹性事件触发控制

本文将电动汽车(Electric vehicles, EVs)引入到典型的信息物理系统(Cyber-physical systems, CPS)智能电网中,采用负荷频率控制(Load frequency control, LFC)方法,能够快速抑制系统扰动所引发的频率变化.在考虑拒绝服务(Denial-of-Service, DoS)攻击的情况下,提出了一种弹性事件触发机制,使系统能够容忍攻击所造成的数据丢失.与此同时,PI型静态输出反馈控制器的输入按需更新,减少了通信负担.对于建立的闭环时滞系统模型,构造新型李亚普诺夫泛函,对系统进行稳定性分析,推导出系统所能承受的最大DoS攻击持续时间,并对控制器增益和弹性事件触发矩阵进行协同设计.最后,通过多域电力系统仿真,验证了所提出方法的有效性.

Resilient Event-triggered Control of Grid Cyber-physical Systems Against Cyber Attack

In this paper, the electric vehicles (EVs) are integrated into the smart grid, a class of representative cyber-physical systems (CPS), and can participate into the load frequency control (LFC) to promptly suppress the variations of system disturbances. In the case of denial-of-service (DoS) attacks, a resilient event-triggering scheme is proposed to allow the system to tolerate data loss caused by the attacks. At the same time, the PI-type static output feedback controller input is updated only when necessary so that the communication burden is reduced. For the established closed-loop time-delay system model, the new Lyapunov functional is constructed to analyze the stability and derive the maximum DoS attack duration, meanwhile the controller gain and the resilient event-triggering matrix are jointly designed. Finally, the effectiveness of the proposed method is verified through multi-area power system simulation.