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考虑网络控制系统中存在的时延,研究了其在有限频域内的故障检测以及容错控制问题。针对有限频域内的故障信号,利用给定指标设计故障检测滤波器产生残差信号。为了保证系统在故障情况下的控制性能,进一步构造基于残差反馈的主动容错控制器对故障进行补偿。给出了故障检测滤波器与主动容错控制器存在并满足有限频域内性能指标的充分条件。利用线性矩阵不等式得到了故障检测滤波器和主动容错控制器参数。数值仿真表明所提方法能够获得良好的故障检测性能和容错控制效果。
Considering the delay in the networked control system, the fault detection and fault-tolerant control problems in the limited frequency domain are studied. Aiming at the fault signal in the limited frequency domain, a fault detection filter is designed by using the given index to generate the residual signal. In order to ensure the control performance of the system under fault conditions, an active fault-tolerant controller based on residual feedback is further constructed to compensate for the fault. The sufficient conditions for the presence of fault detection filters and active fault-tolerant controllers to meet the performance requirements in the finite frequency domain are given. The parameters of fault detection filter and active fault tolerant controller are obtained by using the linear matrix inequality. Numerical simulation shows that the proposed method can achieve good fault detection performance and fault-tolerant control.