Computer-aided design and analysis of linear multivariable controlsystems using the systematic design approach

A new approach for the design of multivariable feedback control systems in the frequency domain is presented. The techniques handle stability, performance, and robustness aspects of the design problem satisfactorily. The overall approach is systematic and intuitively appealing. A new computer-aided control system design package called SFPACK is developed. This package has implemented the new frequency response design techniques. The package is interactive and command-driven, and it is used as a teaching tool for helping the students to understand the concepts of the design approach. The MAT-LAB-derived control environment in SFPACK is extended to provide the user with an expert system development environment     

Design of precompensator for a diagonal interactor using Markov parameters

An interactor plays a basic role in the design problems of multivariable control systems, such as the model matching control, decoupling control, adaptive control, and disturbance decoupling control. For example, it is well known that a linear multivariable system is decouplable by the static state feedback if and only if it has a diagonal interactor. But, in general, the interactor is a lower left triangular matrix, which makes the design problems of multivariable control systems complicated. From this point of view, the precompensator such that the total system has a diagonal interactor is important for multivariable control systems to simplify their design procedure. This paper concerns the systematic design method of the precompensator for a diagonal interactor using Markov parameters of the plant. It will also be proved that this compensator is always obtained by the proposed design algorithm. Furthermore, this argument will be a basic idea when this technique is applied to the nonlinear multivariable systems. © 2008 Wiley Periodicals, Inc. Electr Eng Jpn, 163(1): 65–72, 2008; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20599     

巷道堆跺式自动化立体车库监控系统

介绍了巷道堆垛式自动化立体车库监控系统的结构,工作原理,控制方式,出入库调度的专家系统实现思想,系统编程技术,主要功能特点以及该监控系统的软件设计思想.充分利用PROFIBUS高速通讯特点,实现了立体车库的有效控制与管理.     

Equivalent turbogenerator model for design of multivariable controllers in multimachine systems

The design of multivariable controllers for turbogenerators is usually based on single-machine infinite-bus representations, which are not valid for multimachine power systems. Alternatively, an overall control strategy may be sought for all the generators in the system, but this arrangement is not feasible in practice and involves major mathematical difficulties. The paper describes a method for designing physically-realizable multivariable controllers for individual turbogenerators in multimachine systems, without the assumption of an infinite bus. This employs an equivalent model for each generator, which includes the effects of interconnections with other units in the power system. The method has been used to design optimal state-space controllers for a three-machine system, and results obtained by nonlinear computer simulation show that good performance is achieved.     

多变量系统近似解耦的一种方法

本文讨论了多变量系统的解耦问题,给出了一种简便的解耦补偿矩阵的设计方法.使用这种方法,可以使系统动态近似解耦,稳态完全解耦.     

Expert system for energization of lightly loaded transmission lines

This paper describes an expert system which has been developed to assist in the decision making of voltage control during energizing a high voltage line. A set of rules is used to select the appropriate control action to rectify voltage violations. Controls such as shunt reactors and generator voltages are selected, based on the sensitivity factors. The expert system is built using a command language called COPE. The developed system is implemented on an IBM4381 type computer and tested for the reduced Western Systems Coordinating Council power flow data.     

Computerized decision support in medical imaging

Describes challenges in using image processing and automated feature extraction for improving diagnostic accuracy. The generalization of digital technology in medical imaging makes it possible to design computer-aided decision-support tools to help resolve the difficulties encountered by radiologists. It has already been demonstrated that image processing and automated feature extraction can help improve diagnostic accuracy in some applications. Future challenges are for the development of vision techniques tailored for a wider range of imaging modalities and pathologies the design of methods for the combination of several classifiers, and the implementation of expert systems incorporating both low-level feature extractors and high-level clinical knowledge. After evaluation, these tools will be integrated in PACS systems to highlight regions of interest and to provide clinicians with a documented second opinion. Then, such integrated systems can be used routinely in the clinical practice and teaching of radiology     

Fractional‐order multivariable composite model reference adaptive control

A novel multivariable composite model reference adaptive control scheme is developed for multivariable fractional‐order systems with arbitrary relative degree. Firstly, by introducing right gain matrix to substitute left gain matrix, the stringent symmetry assumption is no longer required. The design procedures of controller with certain and uncertain high‐frequency gain matrix are then provided, respectively. The (robust) stability of the resulting closed‐loop control system is investigated by indirect Lyapunov method. It is shown that the composite model reference adaptive control can achieve better performance on output tracking than that of model reference adaptive control. Finally, the effectiveness and applicability of the proposed control scheme are demonstrated in 3 numerical examples.     

欠驱动机械系统控制设计综述

为了探讨欠驱动机械系统具有一般性的系统化控制设计方法,综述了目前关于欠驱动机械系统控制问题的具体应用和主要方法。基于欠驱动机械系统一般性的动力学描述,介绍了将其动力学转换成具有结构特征的三种级联非线性规范型的归约方法,归纳了针对三种级联规范型的一般性非线性控制方案,对今后欠驱动机械系统控制设计的研究发展方向进行了展望。     

同步发电机励磁控制方法的发展与展望

励磁控制方法的发展经历了线性单变量控制、线性多变量控制、非线性多变量控制及智能控制几个发展阶段,其中线性多变量控制可分为强力式、PID+PSS、线性最优等励磁控制方法;非线性多变量控制可分为鲁棒、变结构、自适应、内模、预测、灰色、自抗扰、Lyapunov、反步、无源、Hamilton、反馈线性化等励磁控制;智能控制可分为模糊、神经网络、支持向量机、专家、学习、遗传、模糊神经等励磁控制。全面地概括了励磁控制方法的发展历史与现状,并按控制理论发展规律对这些方法进行分类,分析这些方法的原理及优缺点,说明励磁控制与其他控制之间的协调方式,指出存在的主要问题及今后的发展方向。     

Knowledge engineering tool for training power-substation operators

Artificial intelligence techniques have been applied to create systems that can give answers for different situations and assistance during the substation switching operation. These techniques have also been used for training purposes. This paper presents a computational package for training power substation operators in the control and corrective actions using expert system techniques. Illustrative examples are presented using a 138 kV CEMIG substation     

面向对象的电力系统调度操作专家系统

介绍了一个面向对象的电力系统调度操作专家系统。基于面向对象的分析和设计技术,设计了适合电力系统调度操作的网络拓扑、知识库和推理机制。开发了一个实用的电力系统调度操作票专家系统。该系统已经在江苏省南通供电局调度所投入使用,具有可靠、高效和方便等优点．     

协调控制系统的专家极点配置自整定方法

本文提出了一种多变量ＰＩＤ控制系统参数在线自整定方法，即多变量专家极点配置（ＭＥＰＰ）法。该方法将单变量ＰＩＤ控制器极点配置自整定方法推广到多变量系统，并成功地运用专家系统原理实现了闭环极点的自动配置，克服了人工试凑的缺陷。该方法用于火电单元机组协调控制系统自整定仿真研究，结果是令人满意的。     

多变量系统的神经元网络智能控制

本文研究了多变量系统的自适应神经元网络智能控制，基于神经元无模型控制的特点［１］，提出了一种非常简单的工程控制方法，这种方法通过粗略计算静态解耦矩阵，对多变量系统进行静态解耦，使用自适应神经元网络对解耦系统进行学习控制。仿真实验表明了这种新方法的有效性。     

State estimation in control centres

The provision of facilities for system security or the implementation of security control is the distinguishing feature of modern power system control centres. After a rather slow beginning, the provision of secirity functions has now become virtually a standard of control centre design. The practical realization of known real-time analytical techniques for security functions has been made possible by the successful development of static state estimation methods for online application. The need for state estimation is examined and the experience of the electric power industry in the development and use of this function is discussed.     

基于建模推理与数据库的电力系统保护信息分析管理专家系统

论述了基于推理与数据库的电力系统保护信息分析的专家系统。该专家系统用来处理自SCADA系统采集的数据和自故障录波器及带录波功能的继电保护装置获取的数据，使用建模推理和数据库技术，保证诊断结果快速可靠，可减轻运行人员的工作量。     

Load–frequency control of interconnected power system with governor backlash nonlinearities

In this paper, the stability-equation method is applied to the analysis and design of an interconnected power system with governor backlash nonlinearities. The considered system is a nonlinear multivariable feedback control system. The governor nonlinearities tend to produce a sustaining oscillation in area frequency and tie-line power transient responses. Most conventional linear design techniques are usually unable to find the sustaining oscillation in design phase and need simulation verifications to check the validations after designs. However, the proposed method can consider effects of nonlinearities in the design phase. Some nonlinear design techniques need parameters optimization method by Lyapunov theorem or Integral of Square Errors (ISE) criteria. They are effective. However, they need large computation efforts. The proposed method can choice frequency bias parameters and integrator gains of supplementary controllers for avoiding the oscillation or reducing the amplitude of the oscillation to be acceptable. Simulation verifications show that the proposed method can provide a simple and effective way for the considered system.     

实时专家控制在自动浇铸系统中的应用

分析了一个浇铸实时控制专家系统RESC的设计与实现 ,在开发系统中采用专家系统技术、实时控制技术。从工艺生产实用要求出发 ,提出适合于连续过程实时控制系统的专家控制方法 ,从而实现了自动浇铸。着重讨论了系统结构、实时控制技术、专家控制方法及系统的实现