基于事件触发的线性网络化控制系统主-被动混合容错控制设计

Design of Hybrid Fault-Tolerant Networked Control System Based on Event-Triggered Scheme

针对一类具有时变时延的线性网络化控制系统(NCS),在离散事件触发通信机制下,研究了执行器任意失效故障的主-被动混合容错控制问题.建立了基于事件触发机制的闭环故障系统模型,设计了能使系统在发生故障集以内的故障时稳定的被动容错控制器.同时,设计故障诊断观测器估计任意执行器失效故障的大小,一旦获得准确的故障信息,立即重构控制器以补偿故障的影响.所设计的主-被动混合容错控制器在执行器任意失效故障下,不但能使系统稳定而且具有良好的控制性能.仿真算例验证了本文方法可在确保故障系统稳定的前提下能有效地节约网络通信资源.

Aiming at a networked control system （NCS） with time-varying delay, under the event-triggered communication scheme, a hybrid fault-tolerant control system （FTCS） combining the merits ot passive ancl active FTCSs was proposed to accommodate actuator failures. Closed-loop failure model of networked control system was established. The design of PFTCS could guarantee the stability of the system under the small faults or the failure within the known fault set. The fault diagnosis observer could detect and estimate the faults at the same time. Once the correct ~ault information was obtained, the AFTCS could compensate for the effect of actuator faults. The hybrid fault-tolerant could compensate all the actuator failures. An example was given to demonstrate that the proposed approach could save network communication resources on the premise of making sure failure system was stable.