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2004 5th Asian Control Conference (IEEE Cat. No.04EX904)

20-23 July 2004

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  • 2004 5th Asian Control Conference - Volume 3 - Cover

    Publication Year: 2004, Page(s): 0_1
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  • [Blank page]

    Publication Year: 2004, Page(s): 0_2
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  • 2004 5th Asian Control Conference - Volume 3 - Title Page

    Publication Year: 2004, Page(s): i
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  • Copyright

    Publication Year: 2004, Page(s): ii
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  • Table of contents

    Publication Year: 2004, Page(s):iii - xiv
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  • Interpolation of measured data based on neural network to model overcurrent relays in power systems

    Publication Year: 2004, Page(s):1393 - 1397 Vol.3
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (771 KB) | HTML iconHTML

    This paper presents a new method for the interpolation of industrial measured data to determine the operation times of overcurrent (OC) relays used in a power system. The proposed technique is based on feed forward multilayer perceptron neural network. The proposed method is simple and efficient to store measured data to find unsampled data, especially when the relation between sampled data is not... View full abstract»

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  • Optimal coordinated voltage control of power systems - an immune algorithm solution

    Publication Year: 2004, Page(s):1398 - 1403 Vol.3
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (942 KB) | HTML iconHTML

    An immune algorithm solution is proposed in this paper to deal with the problem of optimal coordination of local physically based controllers in order to preserve or retain mid and long term voltage stability. A multi-stage coordinated control scheme is presented, aiming at retaining good voltage levels with minimal control efforts and costs after severe disturbances in power systems. A self-patte... View full abstract»

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  • Design of fault detection filter for multi-machine power systems

    Publication Year: 2004, Page(s):1404 - 1409 Vol.3
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (696 KB) | HTML iconHTML

    An on line fault detection scheme for a multi-machine power system is introduced in this paper. The detection approach is based on the idea of decoupling the fault signal from the state and output measurements through coordinate transformations. Once the decoupling process is achieved, the fault signals are treated as unknown inputs and then estimated through the use of observer theory. The propos... View full abstract»

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  • Stability analysis for power swing protection

    Publication Year: 2004, Page(s):1410 - 1413 Vol.3
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (534 KB) | HTML iconHTML

    A transmission line trip during a power swing may cause instability of a power system. It is necessary to recognize the power swing from fault. Based on stability boundary, the power swing blocking relays must be set. To do that, first power swing should be analyzed. Second a way of probability of occurrence of fault must be found. Third, the critical condition under which the stability of a power... View full abstract»

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  • Inverse model based adaptive control of magnetic levitation system

    Publication Year: 2004, Page(s):1414 - 1418 Vol.3
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (879 KB) | HTML iconHTML

    This paper presents, an adaptive finite impulse response (FIR) filter based controller used for the tracking of a ferric ball under the influence of magnetic force. The adaptive filter is designed online as approximate inverse system. To stabilize the open-loop unstable and highly nonlinear magnetic levitation system, PID controller is designed using polynomial approach. To improve the stability, ... View full abstract»

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  • A design of evolutionary recurrent neural-net based controllers for an inverted pendulum

    Publication Year: 2004, Page(s):1419 - 1422 Vol.3
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (525 KB) | HTML iconHTML

    In this paper, the method of acquiring a suitable strategy from imperfect observation inputs used a real-coded genetic algorithm and a recurrent Elman neural network, is proposed. The recurrent Elman neural network is suitable for learning the time series data. The weight parameters and the parameters of sigmoidal functions in the recurrent Elman neural network are optimized based on the imperfect... View full abstract»

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  • Implementation of a sensor fault reconstruction scheme on an inverted pendulum

    Publication Year: 2004, Page(s):1423 - 1428 Vol.3
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (893 KB) | HTML iconHTML

    This paper presents a robust sensor fault reconstruction scheme, using an unknown input observer, applied to an inverted pendulum. The scheme is adapted from existing work in the literature. A suitable interface between the pendulum and a computer enabled the application. Very good results were obtained. View full abstract»

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  • Control-oriented modeling of an electrically actuated piston: an object-oriented approach

    Publication Year: 2004, Page(s):1429 - 1436 Vol.3
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1175 KB) | HTML iconHTML

    The aim of this paper is to present an object-oriented model of an electrically actuated piston. The object-oriented methodology guarantees hierarchical model composition and faster modeling and simulation, as well as reusability of components, connectors and composite acausal connections. We apply the object-oriented modeling language Modelica to obtain our model, which is tested via simulation o... View full abstract»

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  • Simulation of self optimizing mechatronical systems with expert system knowledge

    Publication Year: 2004, Page(s):1437 - 1445 Vol.3
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1443 KB) | HTML iconHTML

    Mechatronic systems with autonomous adaptive behavior gain increasing importance. Although modern adaptive controller systems are able to compensate a changing environment, the approach of self-optimization goes further. The basic idea is not to implement a compensation mechanism which ensures the defined dynamic behavior but to optimize the system during runtime. In addition the aims of the optim... View full abstract»

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  • Application of decoupling controllers to coupled drives process

    Publication Year: 2004, Page(s):1446 - 1452 Vol.3
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (954 KB) | HTML iconHTML

    Control of a coupled drives apparatus laboratory model as a two-inputs-two-outputs system is presented. The coupled drives apparatus is a multivariable model with internal interactions between control loops. It is a nonlinear system with variable parameters. It was assumed, that the dynamic behaviour of the system could be described in the neighbourhood of steady state by a discrete linear model. ... View full abstract»

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  • Relevance of actions and measurements in control performances

    Publication Year: 2004, Page(s):1453 - 1458 Vol.3
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (944 KB) | HTML iconHTML

    In this paper, the relative relevance of input and output variables in achieving the control performance is analysed. In order to compare different control structures, the performances of the closed loop controlled system are expressed by the poles' position. Attached to each input (output), the control effort (control contribution) is defined as the inverse of the maximum admissible delay in its ... View full abstract»

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  • On Vinnicombe metrics and the stability robustness of linear time-varying systems

    Publication Year: 2004, Page(s):1459 - 1467 Vol.3
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1483 KB) | HTML iconHTML

    We present two novel approaches for obtaining stability robustness information about linear time-invariant systems with norm-bounded time-varying output multiplicative perturbations using Vinnicombe metrics. First, a time-varying Vinnicombe metric approximation between a nominal linear time-invariant system and the perturbed linear time-varying system is developed, and we show that a calculable ti... View full abstract»

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  • When is the naive quantized control law globally optimal?

    Publication Year: 2004, Page(s):1468 - 1476 Vol.3
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1382 KB) | HTML iconHTML

    We investigate the properties of a control law which quantizes the unconstrained solution to a unitary horizon quadratic programme. From a quantized receding horizon point of view, this naive quantized control law is globally optimal for horizon one. However, the question arises as to whether it is also globally optimal for horizons greater than one, i.e. whether it solves (in a receding horizon s... View full abstract»

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  • A reduced order discrete-time approximation of continuous-time models

    Publication Year: 2004, Page(s):1477 - 1483 Vol.3
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1025 KB) | HTML iconHTML

    In this paper, a technique to obtain a reduced order discrete approximation of a continuous-time model is proposed. This technique is based on the search of the best fit of the frequency response at a finite and probably large set of frequency points. The approximation uses orthogonal bases, where prior knowledge about the underlying system dynamics can be integrated. This strategy can be combined... View full abstract»

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  • Characterizing families of positive real matrices by matrix substitutions on scalar rational functions

    Publication Year: 2004, Page(s):1484 - 1492 Vol.3
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1463 KB) | HTML iconHTML

    This paper concerns the characterization of positive real matrices generated by substitutions (of the Laplace variable s) in scalar rational transfer function by matrix positive real functions. Our main results are restricted to both strongly strictly positive real matrices arid strictly bounded real matrices. As a way to illustrate our main results, we also include here a partial extension of bot... View full abstract»

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  • Fuzzy sliding mode control for uncertain system based on dynamic compensator

    Publication Year: 2004, Page(s):1493 - 1501 Vol.3
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (899 KB) | HTML iconHTML

    Based on fuzzy sliding mode control, the asymptotical stability problem for non-matching uncertain systems is studied in this paper. By applying dynamic compensator and inequality technique, the stability condition of sliding mode with less conservation is obtained. Because of the application of fuzzy number model and double quadratic function interpolation algorithm much more computational effort... View full abstract»

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  • Adaptive fuzzy sliding mode control design: Lyapunov approach

    Publication Year: 2004, Page(s):1502 - 1507 Vol.3
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (860 KB) | HTML iconHTML

    An adaptive fuzzy sliding mode control algorithm is proposed for a class of continuous time unknown nonlinear systems. In contrast to the existing sliding mode control (SMC) design, where the presence of hitting control may introduce problems to controlled systems, the proposed adaptive fuzzy logic controller takes advantages of both SMC and proportional integral (PI) control. The chattering actio... View full abstract»

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  • Stability and stabilization of fuzzy time-delay systems

    Publication Year: 2004, Page(s):1508 - 1515 Vol.3
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (980 KB) | HTML iconHTML

    In this paper, we consider the stability and stabilization of Takagi-Sugeno fuzzy time-delay systems. It is well-known that Takagi-Sugeno fuzzy systems approximate nonlinear systems and they can even describe a certain class of nonlinear systems exactly. On the other hand, time-delay systems appear in many practical systems and mathematical formulations. Thus Takagi-Sugeno fuzzy time-delay systems... View full abstract»

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  • H/sub /spl infin// filter/controller design for discrete-time Takagi-Sugeno fuzzy systems with time delays

    Publication Year: 2004, Page(s):1516 - 1522 Vol.3
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (963 KB) | HTML iconHTML

    Unlike the existing procedure, a simple transformation converting delay systems into non-delay systems to examine the stability of discrete-time fuzzy systems is proposed in this paper. And the advantage of the proposed method is that it can be specialized to the existing scheme. This method can be extended to deal with both control and filtering problems, therefore two sufficient conditions assur... View full abstract»

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  • Fuzzy supervisory PI controller using hierarchical genetic algorithms

    Publication Year: 2004, Page(s):1523 - 1528 Vol.3
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (782 KB) | HTML iconHTML

    This paper presents a fuzzy supervisory PI controller using a hierarchical genetic algorithm (HGA) which is an optimization algorithm used in defining the optimal number and shape of membership functions, and fuzzy rules. The fuzzy supervisory PI controller is designed and simulated on a heat exchanger system. Sum of square error and sum of absolute error are used as objective functions. Simulatio... View full abstract»

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