基于预测控制长随机网络时延的研究.pdf

华北电力大学硕士学位论文摘要社会在不断发展,控制的对象也在不断复杂化,经典的点到点的控制结构已经不再适用,21世纪的控制系统最大的特点是引入了网络结构。未来新的趋势是智能网络节点传感器、控制器和执行器通过网络构成网络控制系统。与传统结构相比,网络控制系统在布线减少、结构的灵活性、系统的可靠性以及资源的共享性等方面表现出很大的优势;但是随之也带来了一些问题,例如网络导致的时延、丢包等。这些问题使系统的性能不再良好。详细分析这些不利影响后,本文给出了针对长随机网络时延的非建模控制方法和建模控制方法。首先对网络时延进行测试和分析,总结网路时延的特点和规律。然后对短随机网络时延控制系统在四种不同驱动方式下建模。其次对长随机网络时延,给出了一种非建模的控制方法。假设控制器、执行器和传感器都采用时钟驱动方式,针对因网络随机时延导致控制器难以计算这个问题,给出了其解决办法及稳定性证明。最后介绍了长随机网络时延的建模方法。利用长随机网络时延的特点和规律,用小波分解算法将长随机网络时延分解为两部分即固定时延和短的随机网络时延,利用短随机网络时延控制系统的建模方法将长随机网络时延与被控对象建’模为广义被控对象,再引入预测控制器对广义被控对象进行控制。关键词:网络诱导时延;数据包丢失;预测控制;稳定性证明;小波分解华北电力大学硕士学位论文 Abstract With thedevelopment ofsociety,plant es more and plex,the classic control systems can no longer meet theneed,the biggest feature ofcontrol system in21stcentury istheintroduction work futuretrend is that theinformation transfer between work node sensor,controller and actuator isthrough pared work control systems have demonstrated agreat advantage inlesswiring,structural flexibility, system reliability and resource italsobrings insome problems,such work delay and packet loss, issues make thesystem performance no paper proposes thenonmodeling method andthemodeling method of thelong work delay. Firstof all,test and analysis work random delay,conclude the characteristics of work delay,then model the short work delay underfourdifferentdrives. Secondly,this paper proposes anon-modeling control method forlong work thismethod,controller,actuator and sensor are alldriven by clock, because work delay,the controller can not calculate well,SO thispaper gives asolution method and itsstabilityanalysis. Finally,a modeling control method forlong work delay ispresented. Given the characters ofthe long work delay,using wavelet theory,this paper poses thelong work delay intotwo parts:constant delay and short work delay,then use themodeling method of the short work delay,the plant and work are modeled together,at last,predictive controller iSintroduced tocontrol