故障估计的自适应观测器设计

研究了一类自适应观测器实现线性系统的故障估计问题·这类自适应观测器不仅能实现对系统状态的估计,而且也能实现对故障的估计·采用H∞跟踪性能指标分析了这种观测器的设计方法和稳定条件·由这种观测器得到的估计故障与故障幅值大小没有关系,只与故障变化率和给定的H∞跟踪性能指数有关,进而使估计故障能以给定的H∞跟踪性能指数逼近真实故障·最后通过感应电机的传感器故障验证了所提方法的有效性·

Design of Adaptive Observer for Fault Estimation

Fault estimation for linear systems based on a class of adaptive observers is investigated. The system states and faults can both be estimated by such adaptive observers. Utilizing the H∞ tracking performance, the design procedure and condition of stability of the adaptive observers are given. The fault estimation error is irrelevant to the magnitude of fault but relevant to the change rates of fault and H∞ tracking index. Therefore, the estimated fault can approximate to the real fault to any degree of accuracy. A simulation of sensor fault estimation is carried out for induction motor to verify the effectiveness of the proposed method.