创新电网安全稳定控制系统状态在线评估方法研究

当前,随着国家电网逐渐向特高压交直流混联方向发展,为了保障电网的安全,每一座电厂和变电站都必须配备相应的稳态控制体系,而实际条件下,该体系将会在较长时间内持续不停地运转,因此,如何评价其内部的各组成部分和功能,以确保该体系的正常运转成为一个重要的研究课题。针对该问题,本文构建了一套分层的稳定控制系统评价指标,并利用该评价模型对稳定控制系统进行了评价;在稳定控制的目标等级划分和退化状态划分的基础上,给出了多层次从属程度的确定方法;针对系统性能退化程度对系统性能评价指标权值的作用,采用了一种新的评价指标权值与系统性能退化程度相结合的评价指标权值确定方法。通过实例计算,验证了该方法的正确性与实用性,为稳定控制体系的管理与维护提供了科学的理论与技术支撑,保证了稳定控制体系的安全性与可靠性。

状态反馈控制系统的容错控制器设计

针对传感器失效的线性连续系统 ,利用 Riccati方程、L yapunov稳定性定理和广义逆理论 ,给出具有传感器完整性控制器的设计方法。所设计的状态反馈控制器在系统正常时 ,能使闭环极点配置在指定的圆形区域内 ;在一定条件下 ,仍能使传感器故障系统具有渐近稳定性。仿真结果表明了该方法的有效性。

具有有界控制输入的状态反馈控制系统闭环稳定性

本文基于李雅普诺夫定理,给出了具有有界控制输入的离散时间系统和连续时间控制系统的闭环渐近稳定性判据。利用不考虑控制约束时闭环系统李雅普诺夫矩阵方程解,得出了当控制输入有界时,线性状态反馈控制系统为渐近稳定的充分条件。这些判据具有简单的形式,并且易于计算。

基于IFO-KΔx的非线性状态反馈控制系统的几个设计概念

采用Hammerstein模型描述非线性系统时,可以应用增量式函数观测器IFO-K△x设计状态反馈控制系统,数学分析已证明,在不同的前提条件下,Luenberger函数观测器、全维状念观测器和增量式状态观测器均为增量式函数观测器的特例。该文从基于增量式函数观测器的状态反馈控制律作用下的非线性受控系统的闭环系统入手,导出几个重要概念,从而证明基于Hammerstein模型的非线性系统,应用增量式函数观测器设计状态反馈控制系统时,其控制器和观测 器可以独立地设计,即分离原理适用于该文所述之非线性控制系统,为IFO-K△x在热控领域的工程应用奠定理论基础。

增量式函数观测器的概念及其状态反馈控制系统的应用

Luenberger 提出的状态观测器理论可以解决在确定性条件下受控线性系统的状态重构问题,然而,物理世界中一切实际的系统都具有不同程度的非线性。该文采用Hammerstein 模型描述一类非线性系统,明确提出增量式函数观测器的概念,从基本定义出发,通过数学分析,证明 Luenberger 函数观测器、全维状态观测器和增量式状态观测器均为增量式函数观测器的特例。由于增量式函数观测器的数学定义是建立在非线性受控系统的基础上,因此,观测器的应用便可扩展到非线性控制领域。理论分析表明,在选择同样的观测器参数的前提下,增量式观测器的鲁棒性要优于鲁棒 Luenberger 观测器。在 3 座火力发电厂的 6台 300MW 以上容量单元机组工程应用的实践已证明,基于增量式观测器的状态反馈控制与 PID 控制相结合,能实现对大滞后复杂受控对象的高质量控制,具有很强的稳定鲁棒性,其控制算法简单实用,且便于推广。

非连续状态反馈控制系统反馈最大允许时间间隔

提出了一种求解状态反馈的最大允许时间间隔的方法.控制系统采用状态反馈控制,分析了状态反馈时间间隔τ、控制器的输入状态与对象实时状态之间的关系,得到了定量的关系式并给出了证明过程.在此基础上用广义李亚普诺夫稳定性理论方法分析反馈的时间间隔必须满足的条件,并证明了在该条件下系统一定保持渐近稳定.基于此条件得到了求解最大允许时间间隔的方法.实例表明该方法求得的最大时间间隔的保守性较小,并且求解过程也比较简单.

导弹姿态控制系统动态测试研究

分析了某型导弹姿态控制系统频域动态测试遇到的问题及时域测试结果 ,建立了姿态控制系统测试模型 ,并研究了其在时域内的快速动态测试方法。实验表明 ,所建立的测试系统模型是合理的 。

汽温过程状态反馈控制及参数整定

本文介绍了火电厂汽温过程状态变量反馈控制系统的结构和特点,并讨论其有关参数的整定方法。国外应用经验表明状态变量反馈控制系统可有效地提高汽温控制质量,对机组安全、经济运行大有益处。

STATOVAR4-64控制系统在翻车机上的应用

介绍翻车机的运行过程要素 ,对翻车机主传动及重车牵引原控制系统进行改造 ,引入四象限逻辑控制调速系统及超同步逻辑补偿状态控制系统 ,阐述其性能、特点及工作过程 ,针对翻车机主传动运行过程展开讨论。

声光控制电路实验的研究

本实验首次将“医用电子学”中的换能、振荡、放大、开关、整流滤波、稳压、可控硅共七部分组合成一个实际电路。通过这个实验，使学生不但能复习单元电路，而且能系统地，全面的掌握该课程的内容。该电路是利用声音和光线的变化自动控制电路的开关。它模拟了现代一些仪器中的状态控制系统，为今后学习现代医疗仪器奠定了基础。

害虫综合防治建模驱动“半连续动力系统理论”兴起

以害虫综合防治数学建型为启迪,对生物数学研究的一些相关问题开展了一系列的研究.从实际问题出发,我们分别建立了"常微分方程模型"以及对应的"周期脉冲控制模型";随着害虫综合防治常态化管理和环境污染常态化防治的兴起,我们建立了"状态脉冲反馈控制系统"模型,简称"半连续动力系统"模型,提出了"半连续动力系统"相关的概念,创建了其基本理论,并且作了系统性的研究,例如:半连续动力系统的周期解以及周期解的稳定性、同宿轨和同宿分支、异宿轨和异宿分支以及"双边控制系统"等概念及其判定定理的研究;进一步将"半连续动力系统"相应的理论和方法应用于生物数学其他方面的一些相关问题的研究.本文以数学模型为载体,归纳总结了近十多年来对生物数学的研究历程,指出了当前研究中尚待解决的问题.

桥梁结构分析系统在连续箱梁桥施工中的应用

通过桥梁结构分析与施工状态控制系统的应用 ,便于施工中合理控制连续箱型悬臂梁模板的定位标高和梁上荷载分布 ,确保施工过程中结构的可靠度和安全性 ,并以最高精度。

汽车用传感器的应用现状及发展

介绍了汽车发动机控制系统、汽车状态控制系统用传感器的现状及未来发展。

Linear and nonlinear control of a robotic excavator

Various control systems for a robotic excavator named LUCIE (Lancaster University Computerized and Intelligent Excavator),were investigated. The excavator is being developed to dig trenches autonomously. One stumbling block is the achievement of adequate,accurate,quick and smooth movement under automatic control. Here,both classical and modern approaches are considered,including proportional-integral-derivative (PID) control tuned by conventional Zigler-Nichols rules,linear proportional-integral-plus (PIP) control,and a novel nonlinear PIP controller based on a state-dependent parameter (SDP) model structure,in which the parameters are functionally dependent on other variables in the system. Implementation results for the excavator joint arms control demonstrate that SDP-PIP controller provides the improved performance with fast,smooth and accurate response in comparison with both PID and linearized PIP control.

A state estimation based constrained model predictive control system

In this paper,the model predictive control based on the state estimation for a constrained system isinvestigated.By modifying the constraints for the predictive state,the control sequence becomes feasiblefor the real system,i.e.,the system state is guaranteed to be in the constraint domain.It s also provedthat the close-loop system is asymptotically stable and the system state converges to the origin.The conclusionis verified through simulation.

State feedback control for Lurie networked control systems

The problem of the stability analysis and controller design which the network-induced delays and data dropout problems network-induced delays are assumed to be time-varying and bounded, for Lurie networked control systems （NCSs） is investigated, in are simultaneously considered. By considering that the and analyzing the relationship between the delay and its upper bound, employing a Lyapunov-Krasovskii function and an integral inequality approach, an improved stability criterion for NCSs is proposed. Furthermore, the resulting condition is extended to design a less conservative state feedback controller by employing an improved cone complementary linearization （ICCL） algorithm. Numerical examples are provided to show the effectiveness of the method.

Sliding mode control for synchronization of chaotic systems with structure or parameters mismatching

This paper deals with the synchronization of chaotic systems with structure or parameters difference. Nonlinear differential geometry theory was applied to transform the chaotic discrepancy system into canonical form. A feedback control for synchronizing two chaotic systems is proposed based on sliding mode control design. To make this controller physically realizable, an extended state observer is used to estimate the error between the transmitter and receiver. Two illustrative examples were carried out: (1) The Chua oscillator was used to show that synchronization was achieved and the message signal was recovered in spite of parametric variations; (2) Two second-order driven oscillators were presented to show that the synchronization can be achieved and that the message can be recovered in spite of the strictly different model.

Introduction to Unity of Physics and Biology, Inorganic Life Materials

The unity between physics and biology refers to that the inorganic systems： the Solar System, galaxies and artificial systems have the same structures and functions as the organisms. The development of science and technology is demonstrating the intense unification trends of physics and biology and a holistic science and technology era is about to start. The physics and biology unify on the basis of the four seasons＇ law, which is the most important rule of the universe. Life is defined as the four seasons＇ whole with the structure and process of four seasons. The organism is basically structured into a dual four-season body by state-varying, state-stabilizing and control organizations. Animals, the Solar System and the earth are all the dual four-season bodies. In the unity between physics and biology, the inorganic life materials and inorganic life body can be manufactured artificially.

Research of inverse mathematical model to high-speed trains

Operation safety and stability of the train mainly depend on the interaction between the wheel and rail.Knowledge of wheel/rail contact force is important for vehicle control systems that aim to enhance vehicle stability and passenger safety.Since wheel/rail contact forces of high-speed train are very difficult to measure directly,a new estimation process for wheel/rail contact forces was introduced in this work.Based on the state space equation,dynamic programming methods and the Bellman principle of optimality,the main theoretical derivation of the inversion mathematical model was given.The new method overcomes the weakness of large fluctuations which exist in current inverse techniques.High-speed vehicle was chosen as the research object,accelerations of axle box as input conditions,10 degrees of freedom vertical vibration model and 17 degrees of freedom lateral vibration model were established,respectively.Under 250 km/h,the vertical and lateral wheel/rail forces were identified.From the time domain and frequency domain,the comparison of the results between inverse and SIMPACK models were given.The results show that the inverse mathematical model has high precision for inversing the wheel/rail contact forces of an operation high-speed vehicle.