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Control Applications, 1995., Proceedings of the 4th IEEE Conference on

Date 28-29 Sept. 1995

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Displaying Results 1 - 25 of 211
  • Proceedings of the 4th IEEE Conference on Control Applications

    Publication Year: 1995 , Page(s): 0_3 - x
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    Freely Available from IEEE
  • Name index

    Publication Year: 1995 , Page(s): xi - xvi
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    Freely Available from IEEE
  • Parameter estimation of an induction machine using reinitialized partial moments

    Publication Year: 1995 , Page(s): 979 - 984
    Cited by:  Papers (2)
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    In this paper, a nonlinear programming algorithm is applied to the electrical parameter estimation of induction motors. A linear in the parameters output model of the system is obtained thanks to the reinitialized partial moments technique. This method is able to reconstruct the nonmeasured rotor currents. Simulation results show that this algorithm can perform an identification of the five electrical parameters of the motor View full abstract»

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  • Subset selection in identification, and application to speed and parameter estimation for induction machines

    Publication Year: 1995 , Page(s): 991 - 997
    Cited by:  Papers (4)
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    A method to determine which parameters of a model are numerically identifiable is presented. With this method, parameters are separated into ill-conditioned and well-conditioned parameters. Prior information about ill-conditioned parameters can be incorporated into the estimation process resulting in sensitivity reduction and improved numerical performance of estimation algorithms. The method is an extension to nonlinear models of subset selection methods developed in linear regression. The results are illustrated by application to the case of speed and parameter estimation for induction machine. The insights provided by our parameter subset selection approach are of decisive value in this application View full abstract»

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  • Adaptive control of electrically-driven manipulators: theory and experiments

    Publication Year: 1995 , Page(s): 717 - 723
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    This paper presents a new trajectory tracking control scheme for uncertain rigid-link electrically-driven manipulators. The proposed controller is an adaptive strategy which is general, computationally efficient, and readily implementable, and which requires virtually no information concerning either the manipulator or actuator models. It is shown that the controller ensures semiglobal uniform boundedness of all signals in the presence of bounded disturbances, and that the ultimate size of the tracking errors can be made arbitrarily small. Experimental results are presented for an IMI Zebra Zero manipulator and confirm that the proposed approach provides a simple and effective means of obtaining high performance trajectory tracking with this class of manipulators View full abstract»

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  • Computation of time-optimal trajectories for tower cranes

    Publication Year: 1995 , Page(s): 1134 - 1139
    Cited by:  Papers (6)
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    A mathematical model for tower cranes is derived and computation of their optimal trajectories under control and state constraints is undertaken. Large load swings are observed in the simulation of time-optimal trajectories for the actual plant. A sub-optimal control is then proposed to keep the load swings small. Simulation of a typical case is included View full abstract»

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  • Cement mill optimization: design parameters selection of the LQG controller

    Publication Year: 1995 , Page(s): 862 - 867
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    The cement milling circuit can be seen as a two inputs/two outputs system. The designed multivariable control is based on a LQ controller and a Kalman filter. The authors' main goal is to choose the four design parameters (two diagonal weighting matrices) in order to achieve good performances in terms of rise time, deviation and overshoot. The authors have experimented with several selection methods. The paper compares different approaches and shows the latest developments concerning the best of them View full abstract»

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  • Hybrid adaptive control of two-link flexible manipulators grasping a payload

    Publication Year: 1995 , Page(s): 705 - 710
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    The hybrid adaptive control algorithms used for flexible manipulators are presented. The advantages of the hybrid adaptive control against the pure continuous-time adaptive control or discrete-time adaptive control are also discussed. From a practical standpoint, the infrequent adjustment of the control parameters makes for more robust adaptive control while from a theoretical point of view, the algorithms are attractive since they provide a unified framework for the design of hybrid adaptive systems. The hybrid adaptive controllers also do not require the complex mathematical model of the arm dynamics or any knowledge of the arm dynamic parameters or the load parameters such as mass and stiffness. Simulation results are given to illustrate the proposed hybrid adaptive control strategies View full abstract»

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  • Inverting mode failure recovery: application to the drive of a DC generator supplied by a three-phase thyristor converter

    Publication Year: 1995 , Page(s): 383 - 388
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    In this paper, we present a new control strategy for industrial applications with static converters. It is based on a reconfiguration of the firing sequence and on a resetting of a digital controller. Applied to the nonautonomous inverting mode it allows guarantee of a maximal efficiency without decreasing the dependability of the electromechanical process View full abstract»

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  • Sliding mode control and state estimation for nonlinear singularly perturbed systems. Application to an induction electric machine

    Publication Year: 1995 , Page(s): 998 - 1003
    Cited by:  Papers (1)
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    A nonlinear control-observer structure for a class of nonlinear singularly perturbed systems, based on a two-time scale sliding-mode control and an output injection state estimator, is presented. This structure is applied to the model of an induction motor View full abstract»

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  • Application of robust adaptive control to a real-time power plant model

    Publication Year: 1995 , Page(s): 403 - 408
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    The self-tuning minimax predictive controller (MPC) is implemented in real-time on a high fidelity simulation of a fossil fuel heating-cogeneration boiler. The development of the MPC algorithm is outlined in its full multi-input multi-output (MIMO) form. A multiloop structure of MPC controllers is then applied to a nonlinear real time boiler simulator, and evaluated with respect to standard control schemes View full abstract»

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  • Model-based control for nitrogen-eliminating wastewater treatment plants

    Publication Year: 1995 , Page(s): 842 - 847
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    Municipal wastewater-treatment plants (WWTP) have traditionally suffered from a low level of process automation. However sensors and models of the biochemical reactions form the basis for more sophisticated control algorithms. Here the possibilities of model-based multivariable control of WWTP are considered, using model predictive control (MPC) concepts and H∞ control theory View full abstract»

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  • A modified RBF network with application to system identification

    Publication Year: 1995 , Page(s): 649 - 654
    Cited by:  Papers (1)
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    Proposes a modified RBF network in which the regression weights are used to replace the constant weights in the output layer. It is shown that the modified RBF network can reduce the number of hidden units significantly. Moreover, the authors develop a computationally efficient algorithm, known as the EM algorithm, to estimate the parameters of the regression weights. A salient feature of this algorithm is that it decouples a complicated multiparameter optimization problem into L separate small-scale optimization problems, where L is the number of hidden units. The superior performance the modified RBF network over the standard RBF network is illustrated by means of a system identification example View full abstract»

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  • Nonlinear decoupling of an induction motor drive with input filter

    Publication Year: 1995 , Page(s): 1004 - 1009
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (468 KB)  

    In this paper, the nonlinear decoupling control of a high power induction motor with input filter is investigated. Keeping a field-oriented control structure, the decoupling terms are modified so that the physical characteristics of the plant can be taken into consideration. Finally, in order to separate the problems of input filter instability and induction motor control, a decoupled supply voltage control is presented View full abstract»

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  • Comparison of polynomial predictive controllers on a benchmark with flexible modes

    Publication Year: 1995 , Page(s): 961 - 966
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    Within the “model based” control strategies, several predictive control methods have been developed and proved to ensure good performances, even with severe specifications and complex systems. The efficiency of four polynomial predictive control techniques are compared on a benchmark expressing the behaviour of a motor drive connected to different loads through a flexible transmission. The objective is to obtain a robust control for all configurations. The results are analysed in frequency and temporal domains, and discussed in terms of stability, rapidity and precision View full abstract»

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  • Weighting function selection for H based power system stabilizer design

    Publication Year: 1995 , Page(s): 1033 - 1034
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    Despite much progress in applying modern control technology to power system stabiliser (PSS) design with many different suggested PSS structures, many utilities still prefer a conventional PSS structure. The reasons may include ease of on-line tuning and lack of assurance on the stability related to some adaptive or variable structure schemes. Previously developed H and related design methods lead to fixed-structure and fixed-parameter yet robust controllers. Their applications in other areas have showed great potential. In Asgharian (1994) and Chow et al. (1990), some investigations on applying H methods to the PSS design are also presented. Both papers reported the importance and the difficulties in the selection of weighting functions for such design. In addition, the systems studied in both papers were restricted to single-(or two identical) machine infinite-bus power systems. This gives the author the motivation to study (1) a simple and effective way of selecting weighting functions; and (2) applying H method for multi-machine power system PSS design. In this, the author reports a study on the first problem for single-machine infinite-bus systems and this can also be extended to multi-machine power systems View full abstract»

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  • Applications of model based controls on 5 coal fired units to improve thermal and emissions performance

    Publication Year: 1995
    Cited by:  Papers (1)
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    Summary form only given. Virginia Power embarked on an ambitious programme to install Stone and Webster's model based advanced steam temperature control (ASTC) system on Unit 1. The ASTC system included the model reference feedforward steam temperature control system to address the outage issue and the Soot Blow Advisor system to address the NOx emission performance issue. This paper describes these model based systems and their performance on the five coal fired power plants View full abstract»

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  • Multifunctional optimization tool for tuning controllers in industrial environment with application to power plants

    Publication Year: 1995 , Page(s): 415 - 420
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (636 KB)  

    This paper introduces a new multifunctional optimization tool for tuning controllers (MOTC) in the industrial environment. In the MOTC, the flexible integral criteria combining with the optimal seeking techniques are proposed and used for tuning PID controllers as well as process identification and model conversion. It provides the engineers an effective fool to get desired control results in industrial environment with the optimum controllers. The MOTC has been successfully used in many power plants in China View full abstract»

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  • Time-suboptimal control of a flexible structure

    Publication Year: 1995 , Page(s): 162 - 167
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    This paper presents several methods for designing closed-loop time-suboptimal controllers for a flexible structure. All the control strategies are applied to an experiment consisting of a hub with two flexible appendages and their performance to control this flexible structure is examined. The time-optimal bang-bang control based on the rigid body position and velocity is lowpass filtered to limit the excitations of the higher order modes. The lowpass filter is then included in the determination of the time-optimal bang-bang control View full abstract»

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  • A singularity-free position tracking controller for induction motors: theory and experiments

    Publication Year: 1995 , Page(s): 985 - 990
    Cited by:  Papers (1)
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    In this paper, we present a voltage input controller for a single-link robot manipulator actuated by induction motor. The control is designed to compensate for the nonlinear dynamics associated with the mechanical subsystem and the electrical subsystems while only requiring measurements of rotor position, rotor velocity, and stator winding currents. Specifically, through the use of nonlinear observers for rotor flux and an observed integrator backstepping approach, we obtain semi-global uniform ultimately bounded position (SGUUB) tracking. The result is semi-global in the sense that a control parameter must be made sufficiently large relative to the electromechanical initial conditions in order to guarantee that control singularities are avoided. Experimental results are then presented to illustrate the performance of the proposed approach applied to a one-link robot View full abstract»

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  • Fuzzy set theory and problems of the design and control of power systems and subsystems

    Publication Year: 1995 , Page(s): 46 - 51
    Cited by:  Papers (5)
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    This paper presents results of research and experience in the use of fuzzy set theory methodology for handling and overcoming various forms of uncertainty in the design and control of power systems and subsystems. Approaches to solving fundamental problems of constructing fuzzy estimates of uncertain parameters, comparing alternatives in a fuzzy environment, developing basic principles and concrete methods of monocriteria and multicriteria decision making in a fuzzy environment are briefly described. The results of the paper are of a universal character, have found and are being found applications in: the design of distribution systems; optimization of reliability in distribution systems; state estimation, fast analysis, and operation of distribution systems; load management in power systems (power and energy shortage allocation at different levels of territorial, temporal, and situational hierarchy of management) and in industrial power systems (real time control of active load) View full abstract»

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  • A new non-symmetric phase, integral-lead controller for PWM DC-DC converters

    Publication Year: 1995 , Page(s): 366 - 371
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    This paper introduces a new nonsymmetric phase, integral-lead controller that can be used in pulse-width-modulated (PWM) DC-DC power converters. This new controller can provide a peak phase boost of up to 165°, with its phase returning to 0° at high frequencies. This phase characteristic is much improved over that of the commonly used symmetric phase integral-lead controller which provides a peak phase boost of up to 165°, but with -90° of phase at high frequencies. The nonsymmetric phase controller provides to a DC-DC converter, increased gain margin, increased 3 dB bandwidth and decreased phase at high frequencies, over that of a symmetric phase controller. A boost DC-DC converter design example illustrates the improved performance when using the nonsymmetric phase controller over the symmetric phase integral-lead controllers View full abstract»

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  • Robust temperature regulation in chemical reactors with unknown reaction rates

    Publication Year: 1995 , Page(s): 848 - 853
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    In this work we study the stabilization of continuous stirred tank reactor with unknown reaction rates. We prove that, under certain general assumptions, the chemical reactor can be stabilized with a high-gain feedback. Simulations shows that high-gain feedback may lead to hard input saturation and poor closed-loop performance. A reaction rate uncertainty estimator is introduced which, when coupled with a nonlinear feedback, leads to global stability with acceptable control performance. We conclude state observation is unnecessary for the stabilization of the class of chemical reactors here considered View full abstract»

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  • Design of robust controllers for resonant DC/DC converters

    Publication Year: 1995 , Page(s): 360 - 365
    Cited by:  Papers (11)
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    This paper pursues a quantitative feedback theory (QFT) approach to robust controller design for series resonant DC/DC converters. The model is derived using the generalized averaging procedure and the design approach explicitly reveals the tradeoffs involved in the controller synthesis. A nonlinear model is used to verify the performance of the compensator under several load transients View full abstract»

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  • Chattering reduction of a digital variable structure BLDC motor speed control system using a look-ahead law

    Publication Year: 1995 , Page(s): 599 - 604
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    For digitally implemented variable structure controllers, the switching between controller structures cannot be conducted instantaneously. This is due to a finite time delay in obtaining the system states and to compute the command for switching. This time delay, corresponding to the sampling period, introduces an enlarged chattering amplitude as compared to the continuous variable structure controllers. Here, a look-ahead control law is proposed to minimise the chattering where the corrective action is issued on a predicted system representative point in one sampling period ahead. This algorithm needs a minimum additional computational overhead, which amounts to only one multiplication, one subtraction, one sign operation and a comparison Simulation results with an application to a brushless DC motor velocity control system demonstrate the effectiveness of this control law View full abstract»

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