一种有线与无线混杂的NCCS时延补偿方法  

The Method of Time Delay Compensation for a Kind of Hybrid NCCS

作　　者：马冰[1] 杜锋[1] 郭祯[1] 

机构地区：[1]海南大学信息科学技术学院,海南海口570228

出　　处：《计算机仿真》2016年第1期292-296,共5页Computer Simulation

基　　金：国家自然科学基金项目(61263001);海南大学科研启动基金项目(kyqd-1214)

摘　　要：在有线与无线混杂的网络串级控制系统中,由于网络的存在会产生不确定的网络时延,网络时延影响系统的稳定性。针对上述问题,提出一种新型Smith预估补偿控制方法,其方法实现的关键在于以真实的前向网络通路节点之间的网络数据传输过程,代替其节点间网络数据传输时延的预估补偿模型,无论系统是否满足Smith预估补偿的所有条件,但可确保系统满足Smith预估补偿的网络时延条件。其方法的实施与网络时延的大小和性质无关,可免除节点时钟信号同步的要求,降低网络时延对系统稳定性的影响。仿真表明,当被控对象模型在一定范围发生变化时系统具有较强的鲁棒性:当网络时延变化和存在干扰作用时,系统仍然具有良好的动态性与稳定性,以及抗干扰能力。In the hybrid network cascade control system, the insertion of networks into the control loops, which may bring in unsure network delay, affects the stability of the system. To aim at the above question, the method of new Smith predictor is proposed, the key of this method is that true network data transmission replace the predictor compensation models among nodes, no matter what the system satisfies all conditions of Smith predictor, but make sure that it satisfies the network time delay conditions. The implementation of presented method has nothing to do with the size and nature of network time delay, it can avoid the request for the clock synchronous and reduce the influence of stability caused by network time delay. The simulation results demonstrate that the robustness is strong when the control plants model parameters are changed more and anti-interference ability of the system is better when network time delay changed or existing interference.

关 键 词：网络串级控制系统 网络时延 SMITH预估器 

分 类 号：TP273.5[自动化与计算机技术—检测技术与自动化装置]