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.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
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
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
remote monitoring systems, fault diagnosis, fault-tolerant control, optimal control, time-delay systems, delay-free transformation
