智能调度的网络控制系统建模、分析与综合
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摘要
网络控制系统(NCSs)是控制技术与网络技术相结合的产物,自提出以来就得到了广泛的关注。网络控制系统具有网络化的拓扑结构,系统数据具有时延和丢包的特性,使得控制系统现有的理论体系及方法都不再适应于网络控制系统。针对网络控制系统的特点,开展网络控制系统的理论及方法研究,是当今控制领域研究的热点及难点。目前来看,虽然NCSs的研究已经取得了大量的研究成果,但依旧存在诸多重要问题有待解决。本文在实际测量和分析网络状况对控制系统影响的基础上,以网络实际状况为基础,以提高算法的普适性和建模的有效性为目标,针对短时延网络和长时延网络,深入开展了NCSs的建模、分析、设计、参数优化及参数调度等问题的研究。论文的主要工作包括
     1针对短时延NCSs,提出了镇定控制器分析、设计及参数优化方法。首先,采用矩阵增广法对系统进行了建模;其次,利用Lyapunov函数分析了系统的稳定性;然后,应用锥补线性化方法(CCL)求解了状态反馈增益;最后,将状态反馈控制器的设计问题转化为具有稳定域约束的优化问题,并采用分布估计算法(EDA)进行了求解。仿真结果表明:该方法设计的短时延NCSs具有较好的控制性能。
     2为了提高短NCSs的性能,提出了智能调度控制器的建模、分析、设计及参数优化方法。分别以一段时间内的丢包率和平均网络时延来评估网络服务质量(QoS),根据QoS划分来调度状态反馈增益和采样周期,并给出了控制器的建模、分析、设计及参数优化的方法。仿真结果表明:智能调度控制器能有效地改善NCSs的控制性能。
     3针对长时延NCSs,提出了镇定控制器分析、设计、参数优化及参数调度的方法。依据实际网络条件将网络时延分解成固定时延和随机时延,在此基础上,提出了长时延网络控制系统的镇定控制器和增益调度控制器的建模、控制器设计、参数优化及参数调度方法。仿真结果表明:该方法设计的镇定控制器具有较好的控制性能,增益调度控制器能有效改善长时延NCSs的控制性能。
NCSs are the extension and application of computer network in the control field,whose study is an interdisciplinary research area, combining both network and controltheory. The insertion of network in NCSs raises new interesting and challengingproblems such as time delays and packet losses to be addressed, and conventionalcontrol theories must be re-evaluated before applying to NCSs. Recently, NCSs havebeen a hot research topic and a wealth of literature have appeared. However, there arestill some open problems to be addressed. To improve the universality of the networkedmethod, the problems of analysis and design of NCSs with short time delay and longtime delay are studied. The main contributions of the thesis are summarized as follows:
     Firstly, the stabilization and optimization methods are proposed for NCSs withshort time delay. By using state augmentation technique, the closed-loop NCS isrepresented as a discrete-time switched system. Under this framework, the stabilitycondition is derived via Lyapunov approach, and the stabilizing control parameters canbe obtained by the cone complementary linearization method (CCL). Moreover, theoptimal controller design problem is also addressed, where distribution estimationalgorithm method (EDA) is used to compute the optimal control parameters. Simulationresults demonstrate that the resulting NCSs under the proposed method showsatisfactory control performance.
     Secondly, to improve the control performance of the NCSs, the stabilization andoptimization problem based on control parameter scheduling strategy are addressed forNCSs with short time delay. The quality of service (QoS) of the network is estimated bythe packet loss ratio and the average network time delay in a period. Based on thevariation of QoS, the controller with both control parameters scheduling and samplingperiod scheduling is constructed. Simulation results demonstrate the effectiveness of theproposed methods.
     Thirdly, the stabilization and optimization problem of NCSs with parameterscheduling are addressed for NCSs with long time delay. According to the actualnetwork conditions, the network time delay is divided into the fixed time delay and therandom time delay. Then, the stabilization controller and the gain scheduling controller are constructed, where the stabilizing control parameters are obtained with CCLapproach and the optimizing control parameters are solved with EDA algorithm.Simulation results demonstrate the effectiveness of the proposed methods.
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