具有通信约束的网络控制系统稳定性研究

摘要

针对网络带宽的限制,在网络控制系统中需要采用多包传输.为了避免这些网络包发生时序错乱,每次只传输控制对象测量值分出的多个数据包中的一个,从而将这类网络控制系统建模为异步动态系统.多包传输网络控制系统中同样存在大的网络延时,这必将影响系统的控制性能,甚至使系统失稳.为了保证这类系统的稳定性,借助异步动态系统的Lyapunov稳定理论,给出了多包传输长时延网络控制系统的Lyapunov稳定条件.仿真实验结果表明了该方法的有效性.%Considering the constraints of network bandwidth, multiple-packet transmission was adopted here in the networked control system (NCS). To avoid the wrong order of these network packets, only one packet of the plant measurements could be transmitted at a time. Based on the assumption, the NCS was modeled as an asynchronous dynamical system (ADS). In the multiple-packet transmission NCS, there were also long network-induced delays, which would degrade the performance of the NCS, and could even destabilize the system. To guarantee the system's stability, Lyapunov stability theory of ADS was applied to get the sufficient conditions on the stability of the NCS with multiple-packet transmission and long time delays. The simulated experimental results show that the proposed approach is efficient.