网络攻击下基于Round-Robin协议的数字化电力网络的递推状态估计

Recursive state estimation for digitalized power grids subject to cyber attacks under Round-Robin protocol

研究了一类在Round-Robin(RR)协议下遭受网络攻击的数字化电力网络的递推状态估计问题。数字化电力网络中状态估计器和传感器之间的数据传输过程存在被攻击者监听的风险。设计了一种可应用于数字化电力网络的递推状态估计器,能够在保证误差协方差上界的同时,减少网络攻击对状态估计精度的影响;构建了一个含有拒绝服务(DoS)攻击和欺骗攻击的网络攻击模型,并采用RR协议来处理网络堵塞问题;利用代数黎卡提方程方法和随机分析方法,推导误差协方差的上界;最后,通过数值仿真验证了所提出的递推状态估计器设计方案的有效性。

The problems in the recursive state estimation for digitalized power grids subjected to cyber attacks under Round-Robin(RR)protocol are investigated.Data transmitted between the state estimators and the sensors of a digitalized power grid are vulnerable to the interception of adversaries.As a result,a recursive state estimator for the digitized power grid is proposed which can guarantee the upper bound of error covariance while reducing the impact of cyber assaults on the accuracy of state estimation.A cyber-attack model that comprises denial of service(DoS)and deception attacks is constructed.Moreover,the RR protocol is employed to handle network congestion problems,and the algebraic Riccati equations and stochastic analysis are employed to deduce the upper bound of error covariance.Finally,a simulation example is given to show that the proposed design of recursive state estimators is valid.