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改善与提高电力系统稳定性的最经济和最有效的手段是采用先进的控制理论和方法.自20世纪五六十年代以线性系统和最优控制为代表的现代控制理论问世以来,理论创新与工业应用成果丰硕,特别在电力系统中获得了广泛的应用.主要以清华大学电力系统国家重点实验室近四十年来在电力系统控制领域的科研工作为主线,梳理总结其中里程碑式的研究成果并对未来电力系统控制理论和技术的发展做出若干展望. 相似文献
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研究了线性Hamilton系统关于闸轨道边值的Maslov型指标理论及其在非线性Hamilton系统中闸轨道的多重存在性研究中的应用. 相似文献
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基于改进型Bessel-Legendre不等式方法,探讨了电力系统时滞相关鲁棒稳定性问题.首先构建了含有时滞环节的电力系统数学模型表达式,并推广出其含有不确定参数的模型表达式,通过应用时滞系统理论分析方法,有效地处理了泛函导数中的积分项,从而推导出了一个具有更小保守性的电力系统时滞相关鲁棒稳定新判据.通过三个数值实例对仿真结果进行了对比与验证,结果表明推导出的新判据具有有效性与优越性. 相似文献
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一个非线性电力系统的混沌振荡 总被引:14,自引:0,他引:14
分析了一个非线性三参数电力系统振荡的异宿分枝,给出Melnikov函数的留数计算法,并获得电力系统发生混沌振荡的锥性参数区域和带形参数区域,为大偏差状态下保障电力系统稳定运行提供了理论依据和计算方法. 相似文献
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本文指出利用常用的逐步回归方法可以计算出回归分析中常用的5种准则下的局部最优回归子集,而模拟结果显示,在大部分情形下,局部最优回归子集是相重合的.这就为逐步回归方法在应用上的重要性提供了科学依据.最后作者对现今著名的几个数字例子进行计算,其效果也是十分满意的. 相似文献
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广义分散控制系统的无穷远固定模 总被引:16,自引:0,他引:16
在控制系统的理论与应用研究中,广义系统、分散系统越来越受到人们的重视.不仅在理论上已有不少有意义的结果,而且这些理论研究有明显的实际背景.例如 Leontief的动态投入产出模型,Leslie 的人口增长模型,电力系统等.然而,在一些实际系统中,系统不仅具有广义性的特点,而且从控制角度来看也具有分散性的特点.因此我们把系统 相似文献
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Wu Jianhong 《数学年刊B辑(英文版)》1988,9(2):227-238
With the help of a Liapunov functional with seml-negative definite derivative,Barbashin-Krasovskii's theorem is extended to nonautonomous functional differentialequations,a reducing dimension approach is presented for the uniform asymptotic stabilityof high dimension systems,and some sufficient conditions of uniform asymptotic stabilityare obtained. 相似文献
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The existence of a global Liapunov functional for nonlinear evolutionary equations in a Hilbert space is investigated as a continuation of paper [1], The results obtained represent a generalization of the results of the theory of absolute stability [2, 3], for the systems with infinite dimensional phase space, and are used for investigation of the nonlocal stability and instability of nonlinear distributed systems. The conditions of existence of the global Liapunov functional obtained are illustrated by an example of a nonlinear parabolic system defined in the interval [0, 1], The concept of a Liapunov functional was first introduced and used with success in [4]. 相似文献
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Richard Datko 《Journal of Mathematical Analysis and Applications》1977,58(3):510-526
In this paper we give a necessary and sufficient condition for a general class of neutral differential-difference equations to be exponentially stable. This condition is expressed in terms of certain bilinear functionals which are the equivalent of quadratic Liapunov functions for finite-dimensional systems. 相似文献
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It is well known, that in the theory of stability in differential equations, Liapunov's second method may be the most important. The center problem of Liapunov's second method is construction of Liapunov function for concrete problems. Beyond any doubt, construction of Liapunov functions is an art. In the case of functional differential equations, there were also many attempts to establish various kinds of Liapunov type theorems. Recently Burton [2] presented an excellent theorem using the Liapunov functional to solve the asymptotic stability of functional differential equation with bounded delay. However, the construction of such a Liapunov functional is still very hard for concrete problems. In this paper, by utilizing this theorem due to Burton, we construct concrete Liapunov functional for certain and nonlinear delay differential equations and derive new sufficient conditions for asymptotic stability. Those criteria improve the result of literature [1] and they are with simple forms, easily checked and applicable.This project is supported by the National Natural Science Foundation of China. 相似文献
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In this paper we will extend the perturbing Liapunov functionmethod to systems of functional differential equations and discussØ0-equiboundedness and Ø0-equistability propertiesvia the concept of perturbing Liapunov functional. 相似文献
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The theorem on existence of the Liapunov functionals and the theorem on stability in first approximation for a stochastic differential equation with aftereffect are proved.The suggestion of the replacement of Liapunov functions by functionals [1] in the investigation of the stability of ordinary differential equations with lag, has been widely utilized in dealing with determinate systems, as well as in the case of linear and nonlinear stochastic systems (see e. g. [2 – 11]). Results concerning the stability in the first approximation were obtained for stochastic systems in [12 – 18] and others. Use of Liapunov functionals for the differential equations with aftereffect was first encountered in [1, 19, 20] where the inversion theorems were proved and conditions for the stability in first approximation were obtained.Below a stochastic differential equation with aftereffect is investigated where the random perturbations represent an arbitrary process with independent increments. 相似文献
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Liapunov稳定性定理的推广 总被引:2,自引:0,他引:2
本文利用多个Liapunov函数研究部分变元的方法,对自治系统和非自治系统建立了解的稳定性判别准则,推广了有关文献的若干结果. 相似文献
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Electrical networks containing lossless transmission lines are often modeled by difference-differential equations of neutral type. This paper finds sufficient conditions for asymptotic stability for linear systems of these equations. Also given is a modification of the direct method of Liapunov for difference equations. This method is applied to finding asymptotic stability criteria for the discrete analogs of the linear system of difference-differential equations. 相似文献
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Stephen R. Bernfeld 《Annali di Matematica Pura ed Applicata》1970,87(1):227-236
Summary In this paper we investigate the extendability of solutions of ordinary differential equations on [to, ∞) with the use of
Liapunov functions. The results extend to non-unique systems the work done by Conti and Strauss, as well as establishing an
equivalence between two properties of a Liapunov function.
This work is part of the author's doctoral thesis under the direction of ProfessorA. Strauss at the University of Maryland. This research was supported in part by the National Science Foundation under Grant GP-6167.
Entrata in Redazione il 20 febbraio 1970. 相似文献