长时滞网络控制系统的Smith预估模糊PI控制器的设计

随着控制系统规模的不断扩大,控制网络的应用越来越广泛,由此产生了网络控制系统.在网络控制系统中由于网络带宽的限制,不可避免的使系统中存在网络所诱导的时延,它是导致系统性能下降甚至不稳定的一个潜在因素.针对网络所诱导的长时延,将Smith预估器应用到网络控制系统中,并通过与模糊PI控制方法相结合,构成Smith预估模糊PI控制器,设计出的控制器使闭环系统具有较好的性能和稳定性,并对于模型失配的情况具有较高的鲁棒性.仿真结果表明了所提出方法的有效性.

Design of a fuzzy PI controller with Smith predictor for networked control systems with long time delay

Due to the bandwidth constraint, the network-induced time delay is inevitable in the networked control system, which has advert effects on the networked closed-loop control systems such as performance degradation and system destabilization. To the network-induced long time delay existing in the networked control system, a Smith predictor is introduced to the networked control systems. Fuzzy PI control is also combined to constitute a Smith predictive fuzzy PI controller. The obtained controller makes closed-loop system have good performance and high robustness in case of model miss-matching. Simulation result shows the validity of the proposed method.