远程控制时滞系统的故障诊断和容错控制  

Fault diagnosis and fault-tolerant control for remote monitoring systems with delayed controls and measurements

作　　者：李娟[1] 叶若红[1] 尚书旗[1] 

机构地区：[1]青岛农业大学机电工程学院,青岛266109

出　　处：《农业工程学报》2008年第11期145-149,共5页Transactions of the Chinese Society of Agricultural Engineering

基　　金：青岛市科技计划项目(06-2-2-9-jch)资助

摘　　要：针对设施农业远程控制系统中含有控制时滞和测量时滞的情况,研究其发生不可直接测量故障时的故障诊断和容错控制方法。首先设计了系统在故障情况下的最优容错控制律,并证明了最优容错控制律的存在唯一性。为了进行故障诊断并解决最优控制的物理不可实现问题,给出了一种测量时滞的无时滞转换方法,并通过构造含有故障状态的增广系统的降维状态观测器,设计了在线诊断故障的故障诊断器并同时实现了系统状态的观测。最后利用故障诊断的结果给出了物理可实现的动态最优容错控制律。仿真结果验证了该故障诊断方法和动态最优容错控制律的有效性。Facing to the remote monitoring systems with delayed controls and measurements in facility agriculture, the problems of fault diagnosis and fault-tolerant control were investigated. The optimal fault-tolerant control law for faulty systems was designed, and the uniqueness of the optimal fault-tolerant control law was proved. In order to diagnose faults and to solve the physically unrealizable problems of the optimal fault-tolerant control law, a delay-free transformation approach was given for delayed measurements. The on-line fault diagnosis and the observation of system states were realized by constructing the reduced-order state observer for the augmented system comprising fault states. Finally, the physically realizable dynamic optimal fault-tolerant control law was obtained by utilizing the results of fault diagnosis. Simulation results demonstrate the validity of both the fault diagnosis scheme and the dynamic optimal fault-tolerant control law.

关 键 词：远程控制 故障诊断 容错控制 最优控制 时滞系统 无时滞变换 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]