虚假数据注入攻击下基于扩张观测器的滑模控制研究

Sliding mode control based on extended observeragainst false data injection attack

针对虚假数据注入(FDI)攻击下的信息物理系统(CPS),研究了一种基于滑模和扩张观测器的控制方法.首先对系统进行动态线性化,构造了扩张观测器并对观测误差的收敛条件进行了分析.其次,设计了积分滑模面,通过线性矩阵不等式的形式导出滑动模态系统的渐近稳定判据,求出了系统满足L_2增益性能的滑模向量.接着,基于指数趋近律,提出了用来消除量化误差和广义干扰的自适应积分滑模控制器,以使系统能到达滑模面.该方法估计精度高、响应速度快,对FDI攻击和量化参数失配具有较强的鲁棒性.最后,数值仿真验证了该方法的有效性.

Aiming at the cyber physical system(CPS)subject to false data injection(FDI)attack,a control method based on sliding mode and extended observer is proposed.First,the system is dynamically linearized,an extended observer is constructed,and the convergence condition of the observation error is analyzed.Second,the integral sliding mode surface is designed,the asymptotic stability criterion of the sliding mode system is derived by using linear matrix inequality,and the sliding mode vector satisfying the gain performance of the system is obtained.Then,based on the exponential reaching law,an adaptive integral sliding mode controller is proposed to eliminate quantization errors and generalized disturbances,so that the system can reach the sliding surface.The advantages of this method include high estimation accuracy,fast response speed,and strong robustness to FDI attack and quantization parameter mismatch.Finally,numerical simulation verifies the effectiveness of the method.