一类线性奇异系统基于PD观测器的有限频故障估计

摘要

研究一类线性奇异系统的故障估计问题,根据PD观测器的设计理论和研究方法,给出了针对此类系统的故障估计的方法.为了减少外部扰动信号对估计器的影响, 结合扰动信号的的频率, 给出估计器的有限频设计方法.仿真算例验证了方法的有效性.%A new approach to the proportional-derivative (PD) observer design for descriptor system subject to faults and exogenous unknown disturbance is presented.The asymptotic estimate of the descriptor system state and fault are obtained simultaneously.In order to minimize the influence of exogenous unknown disturbance on the estimation, knowledge of the disturbanceoise, such as frequency, is embedded into the design to enhance the performance of fault reconstruction.The proposed method is posed on the solution of LMI and guarantees the estimation of the state and faults to the robust face to exogenous unknown disturbance.A numerical example is valided for the feasibility of the estimate.