In the pursue of providing high quality output regulation and the minimization of energy costs for industrial plants, it has become important to develop high performance servomechanism controllers . Under nominal oper...
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In the pursue of providing high quality output regulation and the minimization of energy costs for industrial plants, it has become important to develop high performance servomechanism controllers . Under nominal operating conditions, such controllers are generally found to be satisfactory. However, severe limitations in performance in such systems often occur when large unanticipated structural controllers which have this property as being ‘intelligent’ . This paper gives an overview of a class of intelligent servomechanism controllers , which is based on the results of [Miller, Davison (1989)], [Change, Davison (1994a)] (Sec. 7.3). These controllers contain a switching device which applies a sequence of LTI controllers to the system, and which after a finite time (i.e. ‘learning time’), switching ceases, resulting in the system being controlled by a LTI controller; the parameters of this LTI controller are then adjusted by on-line tuning to minimize a performance index for the system.
When designing conventional controllers for multivariable systems, the general approach often adopted is to find a suitable nominal model for the plant, which is often a very difficult task, and then to design a contr...
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When designing conventional controllers for multivariable systems, the general approach often adopted is to find a suitable nominal model for the plant, which is often a very difficult task, and then to design a controller based upon this model. If, however, large unexpected structural changes subsequently occur in the system, severe limitations in practical performance may occur since conventional control schemes usually do not have the ability to control systems which are subject to unplanned extreme changes. Moreover, for the realistic situation when a control input constraint exists, few results for continuous time multivariable systems are available. In this paper, a continuation of the author's earlier work is presented for a class of self-tuning proportional-integral-derivative controllers for open loop asymptotically stable MIMO systems. Results of this new controller when applied to several multivariable systems will also be described.
This paper is concerned with an application of a digital adaptive control system to a servo mechanism. Mechanical systems in general include nonlinearities and additional uncertainties and which result from inertia an...
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This paper is concerned with an application of a digital adaptive control system to a servo mechanism. Mechanical systems in general include nonlinearities and additional uncertainties and which result from inertia and friction. So it is difficult to ensure robust performance and high accuracy for motion control. The digital adaptive control system presented here is considered to overcome the above stated problem. Experimental results from a feed drive system demonstrate the effectiveness of the proposed control scheme.
Two major improvements, controlled fan-in and automated initial-circuit production, were made over the random generator of benchmark circuits presented at DAC'94. This is an important progress towards our goal of ...
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ISBN:
(纸本)9780818677861
Two major improvements, controlled fan-in and automated initial-circuit production, were made over the random generator of benchmark circuits presented at DAC'94. This is an important progress towards our goal of random benchmarking: more general and secure testing, increasing the naturality of random circuits by controlling their attributes, and obtaining test results by which the difference of performances under evaluation can be made clear.
作者：
Milanovic, JV[?]Jovica V. Milanovic (1967) received the Dipl.-Ing. (Elec.) and M.Sc. (Elec. Eng.) degrees from the University of Belgrade. Yugoslavia. in 1987 and I99 I
respectively. One year he worked with “Energoproject-MDD”- Engineering and Contracting Co. in Belgrade as an engineer in designing power plants and substations. In late 1988 hejoined the Faculty of Electrical Engineering of the University of Belgrade first as an associate teaching assistant and then (since late 199 I) as teaching assistant at the Dept. of Power Converters and Drives. Between March 1993 and January 1996 he completed his Ph.D. at the University of Newcastle. Australia. at the Dept. of Electrical and Computer Engineering. Since February 1996 he is lecturer at the Department of Electrical Engineering and Computer Science at the University of Tasmania Austnlia. His major interests include synchronous machines and power system transients control and stability. (The University of Tasmania. Dept. of Electrical Engineering and Computer Science GPO Box 252-65 Hobart Tas 7001 Australia.Te1+61 362/262-753 Fax+61 369/262 136. e-mail: Jovica.Milanovic@eecs.utas.edu.au)
The paper presents the overview of load modelling for power-system damping and stability studies with main conclusions summarized from previous research. The attempt has been made to present a cross-section of the mos...
The paper presents the overview of load modelling for power-system damping and stability studies with main conclusions summarized from previous research. The attempt has been made to present a cross-section of the most exploited existing load models together with the most important conclusions drawn from their implementation in power-system stability programs. The current trends and latest results in the domain of damping of electromechanical oscillations in power systems are also presented. The effects of load dynamics on damping of electromechanical oscillations were analyzed on the basis of one of generic load models proposed in the past. The recent results further encourage investigation in this area and highlights the importance of proper load modelling.
作者：
Gubina, FCurk, J[?]Prof. Dr. Ferdinand Gubina (1939) received the Diploma Engineer
M.Sc. and Dr. Sc. dcgms from h e University of LjubljandSlovenia in 1963. 1969 and 1972. respectively. From 1963 he was with the “Milan Vidmd” Electroinstitute Ljubljana. He was heading the Power System Opention and Control Department. In 1970 he joined for one year the Ohio State University Columbus Ohio as a teaching associate. Since 1988 he has been professorat the University of Ljubljana. His main interests lie in the area of electric power system operation and control. He is men ber of SC 39 CIGRE.ParislFrance and president of the National CIGRE Committee. (University of Ljubljana Faculty of Electrical and Computer Engineering Tmska256 loo0 Ljubljanalslovenia. Phone: + 38 66 I I2646 29 Fax: +38 66 1 I2646 30. E-mail: gubina@lddees.fer.unilj.si)
A new concept of highly decentralized secondary voltage control is presented. The concept is based on secondary voltage controllers attacked to each reactive power source. The secondary controllers utilize only local ...
A new concept of highly decentralized secondary voltage control is presented. The concept is based on secondary voltage controllers attacked to each reactive power source. The secondary controllers utilize only local information available from measurements at the generating bus and they act completely autonomously. To successfully attain information on the electrically close load bus behaviour describing their voltage profile, a group of fuzzy sets is derived based on intrinsic load node properties and statistics of their voltage deviations. They are used in the fuzzy decision process to yield new reference setting for primary voltage controllers. The tests results of proposed modular secondary control are presented for standard and non-standard networks. The efficacy of the new concept is demonstrated.
K-band pilot tone data collected by the Advanced communications technology satellite (ACTS) mobile terminal (AMT) during 1994 are used to characterize the K-band land-mobile satellite channel, The characterization is ...
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K-band pilot tone data collected by the Advanced communications technology satellite (ACTS) mobile terminal (AMT) during 1994 are used to characterize the K-band land-mobile satellite channel, The characterization is twofold: a probability density model is derived which shows that the fade exceedance levels at K-band are much higher than those at lower frequencies, particularly at L-band. Furthermore, the fade statistics are very dependent on the geometry of the surrounding environment. The difference between good and bad environments is much more pronounced at K-band than at L-band. A discrete time model is used to provide insight into the bursty nature of the errors induced by propagation effects on the channel. For a data rate of 9600 bps, the average fade duration for a fade threshold of 6 dB is of the order of a few thousand bits, which corresponds to a fade duration of 2-5 ms. The fade durations are typical of those at L-band which suggests that whereas the K-band fades are more severe than those at L-band, the durations are approximately the same.
A fundamental limitation in achieving high performance control for multivariable plants is associated with the operating range of the control input signals associated with the plant, i.e. in order to design realistic ...
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A fundamental limitation in achieving high performance control for multivariable plants is associated with the operating range of the control input signals associated with the plant, i.e. in order to design realistic controllers for a plant, it is essential to take into account control signal saturation effects. This paper describes various classes of controllers for a LTI plant, which have the property that they solve the robust, servomechanism problem for constant tracking/disturbance signals, and maximize the operating range of the controllers for the plant . Some application studies re the control of a distillation column with pressure variation are included to illustrate the behaviour of the controllers.
We consider a special discrete-time hybrid problem: the plant state "lives" in IRn and is affected by real-valued norm-bounded disturbances;the control input and measurement signals are sequences of symbols....
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This paper presents an investigation into tne nature ot control algorithms in relation to that of the architectures for real-time applications so that a close match be forged between them. Several algorithms of regula...
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This paper presents an investigation into tne nature ot control algorithms in relation to that of the architectures for real-time applications so that a close match be forged between them. Several algorithms of regular and irregular nature are implemented on a number of architectures possessing different features. Partitioning and mapping of the algorithms, algorithm regularity and hardware and algorithm granularity are addressed in implementing the algorithms on parallel architectures. A comparison of the results of implementations is made to establish merits of the development of parallel architectures for real-time applications. Finally, the potential of heterogeneous architectures in real-time applications has been justified by the development of a three-node architecture and its performance verification in comparison to uni-processor and two-node homogeneous and heterogeneous architectures.
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