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  • Conference paper
    Alessandri A, Parisini T, 1998,

    Direct model-based fault diagnosis using neural filters

    , 3rd IFAC Symposium on Fault Detection, Supervision and Safety for Technical Processes 1997 (SAFEPROCESS 97), Publisher: PERGAMON PRESS LTD, Pages: 343-348
  • Journal article
    Pytlak R, Vinter RB, 1998,

    A Feasible Directions Type Algorithm for Optimal Control Problems with State and Control Constraints

    , SIAM Journal on Control and Optimization, Vol: 36, Pages: 1999-2019
  • Journal article
    Halikias GD, Jaimoukha IM, 1998,

    The 2-block superoptimal AAK problem

    , MATHEMATICS OF CONTROL SIGNALS AND SYSTEMS, Vol: 11, Pages: 244-264, ISSN: 0932-4194
  • Journal article
    Lee YS, Wang SJ, Hui SYR, 1997,

    Modeling, analysis, and application of buck converters in discontinuous-input-voltage mode operation

    , IEEE Transactions on Power Electronics, Vol: 12, Pages: 350-360, ISSN: 0885-8993

    By adding a suitable LC filter to the input of a Buck converter, it is possible to force the converter into discontinuous-input-voltage mode operation. A Buck converter in this mode of operation has useful properties such as power factor correction and soft turn-off switching. The operation, modeling, low-frequency behavior, and application of the converter are studied. Experimental results verifying the theoretical predictions are also presented. © 1997 IEEE.
  • Journal article
    Hui SYR, Fung KK, 1997,

    Fast decoupled simulation of large power electronic systems using new two-port companion link models

    , IEEE Transactions on Power Electronics, Vol: 12, Pages: 462-473, ISSN: 0885-8993

    Algorithms of novel two-port companion link models for fast decoupled simulation are presented. The link models enable a large circuit to be broken down into many small subcircuits for easy circuit formulation and fast simulation. The proposed link algorithms are demonstrated in a converter-fed dc transmission system with a transmission-line length equivalent to 1000 km. Simulation and experimental results from a laboratory setup have confirmed the validity of the link models. Proposed simulations are also found to be faster and more accurate than PSpice simulations in the example. © 1997 IEEE.
  • Journal article
    Hui SYR, Eric Cheng KW, Narayana Prakash SR, 1997,

    A fully soft-switched extended-period quasi-resonant power-factor-correction circuit

    , IEEE Transactions on Power Electronics, Vol: 12, Pages: 922-930, ISSN: 0885-8993

    This paper presents the design criteria, procedure, and implementation of a soft-switched power-factor-correction (PFC) circuit based on the extended-period quasi-resonant (EP-QR) principles. All power electronic devices including switches and diodes in the circuit are fully soft switched. The design method is demonstrated in a prototype circuit. The operating principles are confirmed with computer simulation and experimental results. A comparison of the EP-QR operation and zero-voltage-transition (ZVT) pulse-width modulation (PWM) method, supported with simulation and measurements, is included.
  • Journal article
    Hui SYR, Oppermann I, Sathiakumar S, 1997,

    Microprocessor-based random PWM schemes for DC-AC power conversion

    , IEEE Transactions on Power Electronics, Vol: 12, Pages: 253-260, ISSN: 0885-8993

    Two classes of microprocessor-based random PWM (RPWM) real-time schemes for dc-ac power conversion are compared and evaluated. Performance of the RPWM schemes based on the mathematical and logical approaches is examined. The proposed schemes exhibit excellent harmonic content with all low and high-order harmonics suppressed and are suitable for both MOSFET and IGBT inverters. © 1997 IEEE.
  • Journal article
    Hui SYR, Sathiakumar S, Sung KK, 1997,

    Novel random PWM schemes with weighted switching decision

    , IEEE Transactions on Power Electronics, Vol: 12, Pages: 945-952, ISSN: 0885-8993

    A new random pulse-width modulation (RPWM) scheme, which includes a weighted decision switching process, has been developed and tested. The switching strategy can be applied to the entire range of the modulation index. The scheme combines the advantages of the deterministic nature of the standard pulse-width modulation (PWM) schemes, and the nondeterministic spread-spectral characteristic of RPWM schemes. Test results have confirmed the improved spectral performance of the proposed schemes over a standard RPWM scheme at both low- and high-modulation indexes.
  • Journal article
    AlHusari MMM, Jaimoukha IM, Limebeer DJN, 1997,

    A descriptor solution to a class of discrete distance problems

    , IEEE TRANSACTIONS ON AUTOMATIC CONTROL, Vol: 42, Pages: 1558-1564, ISSN: 0018-9286
  • Journal article
    Alessandri A, Parisini T, 1997,

    Nonlinear modeling of complex large-scale plants using neural networks and stochastic approximation

    , IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS PART A-SYSTEMS AND HUMANS, Vol: 27, Pages: 750-757, ISSN: 1083-4427
  • Journal article
    Hui SYR, Chung H, 1997,

    Parallellism of power converters for automatic power factor correction

    , Electronics Letters, Vol: 33, Pages: 1274-1276, ISSN: 0013-5194

    The modular development of a single-stage AC-DC power converter is described. The converter offers several advantageous features.
  • Journal article
    Halikias GD, Jaimoukha IM, Wilson DA, 1997,

    A numerical solution to the matrix H-2/H-infinity optimal control problem

    , INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL, Vol: 7, Pages: 711-726, ISSN: 1049-8923
  • Journal article
    Astolfi A, 1997,

    Singular H-infinity control for nonlinear systems

    , INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL, Vol: 7, Pages: 727-740, ISSN: 1049-8923
  • Journal article
    Shrivastava Y, Hui SYR, Sathiakumar S, Chung H, Tse KKet al., 1997,

    Effects of continuous noise in randomised switching DC-DC converters

    , Electronics Letters, Vol: 33, Pages: 919-921, ISSN: 0013-5194

    A randomly switched DC-DC converter reduces the magnitude of discrete harmonics but creates continuous noise in the output voltage. Continuous noise within the passband of the output filter is found to induce low-frequency voltage ripple in the converter output. This adverse effect is inherent in all randomised switching schemes and is confirmed by both theory and experiment.
  • Journal article
    Alessandri A, Parisini T, Zoppoli R, 1997,

    Neural approximators for nonlinear finite-memory state estimation

    , INTERNATIONAL JOURNAL OF CONTROL, Vol: 67, Pages: 275-301, ISSN: 0020-7179
  • Journal article
    Zoppoli R, Parisini T, 1997,

    Optimization problems and neural networks

    , AEI AUTOMAZIONE ENERGIA INFORMAZIONE, Vol: 84, Pages: 62-71, ISSN: 0013-6131
  • Conference paper
    Parisini T, 1997,

    Physically accurate nonlinear models for fault detection and diagnosis: The case of a power plant

    , 13th International-Federation-of-Automatic-Control World Congress, Publisher: ELSEVIER SCI LTD, Pages: 97-109, ISSN: 0959-1524
  • Journal article
    Fung KK, Hui SYR, 1997,

    Duality of transmission line models for simulation of reactive circuit components

    , Mathematics and Computers in Simulation, Vol: 44, Pages: 143-154, ISSN: 0378-4754

    This paper presents Norton transmission line (TL) models and equivalent circuits for the simulation of reactive circuit components. These models, not only retain the obvious physical concepts of Thevenin-TL models, but also allow the nodal analysis technique to be used, overcoming the inherent difficulties in system matrix formation using the Thevenin models. The Norton models are derived and then applied to simulate a high-frequency switched mode power supply circuit. Details of the simulation process are discussed in a tutorial style.
  • Conference paper
    Astolfi A, Kraus FJ, Qiu X, Schaufelberger Wet al., 1997,

    Identification and LQ-control of a servo-system

    , Computer Aided Education in Automation and Control, Bratislava, Slovak Republic
  • Journal article
    Astolfi A, 1997,

    On the relation between state feedback and full information regulators in nonlinear singular H_ control

    , IEEE Trans.Automatic Control, Vol: 42, Pages: 984-988
  • Journal article
    Do M, Pinho R, Vinter RB, 1997,

    Necessary Conditions for Optimal Control Problems Involving Nonlinear Differential Algebraic Equations

    , Journal of Mathematical Analysis and Applications, Vol: 212, Pages: 493-516
  • Journal article
    Vinter RB, Zheng H, 1997,

    The Extended Euler-Lagrange Condition for Nonconvex Variational Problems

    , SIAM Journal on Control and Optimization, Vol: 35, Pages: 56-77
  • Journal article
    Bell ML, Sargent RWH, Vinter RB, 1997,

    Existence of optimal controls for continuous time infinite horizon problems

    , International Journal of Control, Vol: 68, Pages: 887-896
  • Journal article
    Vinter RB, Woodford PD, 1997,

    On the occurrence of intermediate local minimizers that are not strong local minimizers

    , Systems and Control Letters, Vol: 31, Pages: 235-242
  • Conference paper
    Astolfi A, 1997,

    A remark on the stabilization of minimum phase nonlinear systems

    , 4rd European Control Conference, Brussels, Belgium
  • Journal article
    Astolfi A, Schaufelberger W, 1997,

    State and output feedback stabilization of multiple chained systems with discontinuous control

    , Systems and Control Letters, Vol: 32, Pages: 49-56
  • Conference paper
    Astolfi A, 1997,

    A family of stabilizing controllers for the nonholonomic integrator

    , IFAC Symposium on Robot Control, Nantes, France
  • Journal article
    Green TC, Taha MH, Rahim NA, Williams BWet al., 1997,

    Three-phase step-down reversible AC-DC power converter

    , IEEE Trans.Power Electronics, Vol: 12, Pages: 319-324
  • Journal article
    Clarke FH, Ledyaev Y, Vinter RB, 1997,

    Regularity properties of solutions to linear quadratic optimal control problems with state constraints

    , Systems and Control Letters, Vol: 30, Pages: 265-272
  • Journal article
    Astolfi A, 1997,

    Singular H-inf Control for Nonlinear Systems

    , International Journal of Robust and Nonlinear Control, Vol: 7, Pages: 727-740

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