一类不确定非线性相似组合大系统的结构相似鲁棒观测器设计

对一类不确定非线性相似组合大系统，设计出一种渐近观测器，说明在了一定条件下，相似系统存在结构相似主鲁棒观测器，并通过一个数值算例说明了本文的结论及结构相似鲁棒观测器的设计方法，仿真结果表明了所得结论的有效性。     

一类具有相似结构的不确定组合大系统的观测器设计

讨论了非线性组合大系统渐近观测器的设计问题。对一类具有相似结构的非线性不确定组合大系统构造出其鲁棒渐近观测器，并举例说明所提出的渐近观测器的设计方法。     

一类广义相似组合系统的鲁棒渐近观测器设计

描述两个控制系统间的广义相似性概念,并针对一类具有不确定参数的非线性广义相似大系统设计出一种具有相似结构的鲁棒渐近状态观测器。这类组合系统可由若干个不同状态维数的子系统构成。算例结果表明了所采用方法的有效性。     

一般非线性相似组合大系统的渐近观测器

利用现代微分几何方法和分析法相结合,给出了由一般非线性控制系统经非线性 互联而成的相似组合大系统渐近观测器存在的充分条件.     

非线性组合系统基于状态观测器的分散镇定

讨论了一类非线性相似组合系统的基于估计状态反馈的分散控制问题。构造了非线性渐近状态观测器,并证明了状态误差按指数收敛到零。同时,给出了组合系统经估计状态向量的反馈控制可实现分散镇定的一个充分条件。     

一类非线性系统的控制器和观测器设计

研究一类非线性系统的全状态反馈控制问题、观测器设计问题及输出反馈控制设计问题.首先设计出非线性全状态反馈控制器,获得了系统指数镇定的充分条件.然后提出了非线性观测器,并证明了该观测器是指数稳定观测器.进一步,在控制器和观测器问题的充分条件满足的假设下,证明了提出的带估计状态的反馈控制能达到指数镇定.最后,仿真实例验证了所得结果的有效性.     

基于输入输出线性化方法的一类多输入多输出非线性系统的观测器设计

研究一类多输入多输出仿射非线性系统的状态观测器设计问题. 基于输入输出线性化方法提出了一类多输入多输出仿射非线性系统的状态观测器设计的新方法, 并给出保证状态估计误差渐近趋于零的充分条件. 算例表明了所得结果的有效性.     

非线性复杂控制系统相似性结构研究的若干结果*

提出了非线性组合系统的相似性结构定义,讨论了这类具有相似结构的非线性组合系统的若干分散控制问题.利用系统的相似性结果,给出了相应控制器的设计方案.所得结果表明,复杂系统的相似性结构有助于简化系统的分析与设计.     

一类非线性时变系统基于观测器的反馈稳定化

1　引言目前,有关非线性系统的状态反馈控制已取得了许多引人注目的研究结果,其中状态可测是此控制方法中的一个必不可少的假设.在实际中,许多系统的状态是部分可测或不完全可测,故构造观测器,并用估计状态实现反馈控制是一个非常有意义的研究工作.本文研究了一类仿射非线性时变系统基于状态观测器的输出反馈稳定控制问题.首先设计了系统的状态观测器,然后综合控制器和观测器得到了非线性输出反馈控制器,并证明了反馈后闭环系统的指数稳定性.研究结果表明,系统的控制器与观测器可以分离独立进行设计.2　系统的描述及预备知识考虑下列非线性…     

一类非线性不确定组合系统基于观测器的鲁棒分散镇定

讨论一类组合系统的鲁棒观测器的设计及该类系统基于估计状态反馈分散镇定问题.所设计的变结构观测器使得观测误差渐近趋于零,基于估计状态所设计的鲁棒分散控制器确保闭环系统是渐近稳定的,系统的相似结构使得所设计的各个子系统的分散观测器以及控制器在结构上具有一致性,从而简化了系统的设计.     

改进牛顿法大规模电力系统潮流计算

电网互联导致电力系统规模不断扩大,对牛顿法进行潮流计算提出了更高的要求。探讨5种改进牛顿法应用到大规模电力系统潮流计算中。经IEEE 300、Poland多个互联的大规模电力系统共6个算例分析表明,算法1和算法2改善了初值范围,同样的迭代次数下,收敛精度较经典牛顿法高,但计算时间较经典的牛顿法并未明显提高;算法3和算法4提高潮流计算的速度和收敛精度。经UCTE 1254病态系统测试,算法3较算法5能高效地处理病态潮流问题,因而更适合于大规模电力系统潮流计算。     

A review of: “CONNECTIVITY,COMPLEXITY, AND CATASTROPHE IN LARGE-SCALE SYSTEMS”, by John Casti. John Wiley,New York, 1979, XIII+203 pp. (Volume 7 in Wiley/IIASA International Series on Applied Systems Analysis. )

A complex large-scale system is a central subject of systems engineering. However, there is no integrated theory for it partially because it has been treated on a specialized model built for a specific purpose. This paper, in order to lay a foundation for a theory of a complex large-scale system, introduces a general definition of a complex system in the framework of the general systems theory and characterizes an interaction which is one of the most basic concepts of a complex system.

This paper shows that every interaction consists of two primitive interactions, process and system interactions and that they have some unique representations. Models of complex systems are classified according to their types of interactions and it is shown as an application of the above analysis that this classification is relative to realization of a system, that is, a model can be transformed from one type into another by restructuring its input-output pair.     

具有多个未知常时滞线性系统的时滞无关稳定性

本文针对线性时滞系统包括时滞在系统建立了时滞无关的稳定性判据，所考虑的时滞可以是多任意未知常时滞，故所得结果是对滞无关的，针对线性时滞大系统的一个说明例子比较证明了所建立的结果好于文献中存在的结果。     

一种用户行为分析的动态备份机制

目前大多数分布式存储系统采用静态备份机制保证系统的高可靠性,灵活性差,不适合系统规模及用户访问量不断变化的存储系统．因此提出一种基于用户行为分析的动态备份机制,通过分析用户行为获得相关信息来动态改变备份数量及确定备份位置,具有较强的灵活性,适合大规模的分布式存储系统;实现动态备份系统将其应用于已建立的科技信息数据中心．通过实验分析表明,该动态备份机制能提高系统的可靠性。     

含非匹配互联项的一类大型互联非线性系统的鲁棒分散控制

本文对带有界扰动的一类含非匹配互联项的大型互联非线性系统进行了分散状态反馈控制设计, 通过子系统状态的线性变换, 得到分散状态反馈控制律. 当状态反馈控制律作用于该系统时, 无扰动的闭环系统是全局渐近稳定的, 当扰动有界时, 系统的状态能够收敛到原点的一个与扰动的界相关的邻域内, 并给出仿真算例说明该结论的可行性和有效性.     

Systems analysis of life cycle of large-scale information-control systems

Results of analysis of problems associated with life cycle cost reduction for large-scale information-control systems are presented. Rational design concepts with application of an aspect-oriented method for large-scale systems are described. An approach to life cycle organization corresponding to the ISO/IEC 12207-2008 standard on the basis of domain engineering and model-driven engineering technologies is proposed. The paper shows a necessity of using the approach within a unified mathematical semantic base supplied by category theory. The approach has been tested during development of application information-control systems in energy production.     

Optimal tracking control for nonlinear large-scale systems with persistent disturbances

This paper studies the optimal control with zero steady-state error problem for nonlinear large-scale systems affected by external persistent disturbances. The nonlinear large-scale system is transformed into N nonlinear subsystems with interconnect terms. Based on the internal model principle, a disturbance compensator is constructed such that the ith subsystem with external persistent disturbances is transformed into an augmented subsystem without disturbances. According to the sensitivity approach, the optimal tracking control law for the ith nonlinear subsystem can be obtained. The optimal tracking control law for the nonlinear large-scale systems can be obtained. A numerical simulation shows that the method is effective.     

Uniform stability of large-scale delay discrete impulsive systems

This article investigates the problem of uniform stability for the large-scale delay DIS (discrete impulsive systems). By establishing the comparison principle for the general delay DIS, uniform stability criteria are derived for three kinds (linear, affine and non-linear) of large-scale delay DIS. The obtained criteria shows that the stability properties of non-linear large-scale delay DIS can be derived by comparing to a linear and lower dimension delay DIS, with known stability properties. Some examples are given to illustrate results obtained by us.     

Hybrid singular systems of differential equations

This work develops hybrid models for large-scale singular differential system and analyzes their asymptotic properties. To take into consideration the discrete shifts in regime across which the behavior of the corresponding dynamic systems is markedly different, our goals are to develop hybrid systems in which continuous dynamics are intertwined with discrete events under random-jump disturbances and to reduce complexity of large-scale singular systems via singularly perturbed Markov chains. To reduce the complexity of large-scale hybrid singular systems, two-time scale is used in the formulation. Under general assumptions, limit behavior of the underlying system is examined. Using weak convergence methods, it is shown that the systems can be approximated by limit systems in which the coefficients are averaged out with respect to the quasi-stationary distributions. Since the limit systems have fewer states, the complexity is much reduced.