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  • Journal article
    Angeli D, Sontag ED, Wang Y, 2000,

    A characterization of integral input-to-state stability

    , IEEE Transactions on Automatic Control, Vol: 45, Pages: 1082-1097, ISSN: 0018-9286

    The notion of input-to-state stability (ISS) is now recognized as a central concept in nonlinear systems analysis. It provides a nonlinear generalization of finite gains with respect to supremum norms and also of finite L2 gains. It plays a central role in recursive design, coprime factorizations, controllers for nonminimum phase systems, and many other areas. In this paper, a newer notion, that of integral input-to-state stability (iISS), is studied. The notion of iISS generalizes the concept of finite gain when using an integral norm on inputs but supremum norms of states, in that sense generalizing the linear "H2" theory. It allows one to quantify sensitivity even in the presence of certain forms of nonlinear resonance. We obtain here several necessary and sufficient characterizations of the iISS property, expressed in terms of dissipation inequalities and other alternative and nontrivial characterizations. These characterizations serve to show that integral input-to-state stability is a most natural concept, one that might eventually play a role at least comparable to, if not even more important than, ISS. © 2000 IEEE.
  • Journal article
    Ho YKE, Hui SYR, Lee YS, 2000,

    Characterization of single-stage three-phase power-factor-correction circuit using modular single-phase PWM dc-to-dc converters

    , IEEE Transactions on Power Electronics, Vol: 15, Pages: 62-71, ISSN: 0885-8993

    The complete dc characteristics of the three-phase modular power-factor-correction (PFC) converters using single-phase pulsewidth modulation (PWM) dc-to-dc converter modules for high-power application are studied. Using circuit averaging, the converter input and output quantities are determined numerically. Both the continuous and discontinuous output current modes of operation (CCM and DCM) are studied in detail. Near-unity power factor can be achieved with the converter modules operating in the DCM. An averaged model was used to study and determine the boundaries between DCM and CCM over the full period of the three-phase input voltage. It is found that high power factor is inherent in the converter system provided that the converters are operated in the DCM and the voltage conversion ratio is selected properly. The criteria for obtaining high power factor are analyzed and the optimal circuit parameters are determined to obtain the best achievable power factor. Both simulations and experimental results from a 1.5-kW prototype using full-bridge converter modules have confirmed the analysis.
  • Journal article
    Chung HSH, Hui SYR, Tang SC, Wu Aet al., 2000,

    On the use of current control scheme for switched-capacitor DC/DC converters

    , IEEE Transactions on Industrial Electronics, Vol: 47, Pages: 238-244, ISSN: 0278-0046

    This paper presents an investigation into the use of a current control scheme (CCS) and a comparison with a classical switching scheme for switched-capacitor (SC) step-down dc/dc converters. With the CCS, capacitors are charged with near-constant current, controlled by the gate-source voltage of MOSFET's. By paralleling two SC cells, the converter input current becomes continuous, resulting in much reduced conducted electromagnetic interference with other circuits fed by the same power supply. All MOSFET's are operated for half of the switching period, in order to improve the regulation capability. Static and dynamic behaviors of the converter with the CCS are predicted and confirmed in an experimental 36-W 12-V/9-V prototype.
  • Journal article
    Angeli D, Casavola A, Mosca E, 2000,

    Predictive PI-control of linear plants under positional and incremental input saturations

    , Automatica, Vol: 36, Pages: 1505-1516, ISSN: 0005-1098

    A predictive control strategy is developed for set-point tracking of LTI plants in the presence of joint positional and incremental (rate) input saturation constraints. The resulting control algorithm is built so as to provide an integral action capable to asymptotically reject arbitrary constant disturbances. This task is achieved by possibly modifying on-line the set-point in the case this becomes incompatible with constraints and disturbances. When applied to asymptotically null controllable with bounded inputs (ANCBI) plants, viz. all stabilizable linear systems with eigenvalues in the closed unit circle, the control law is shown to globally provide set-point tracking in the presence of arbitrary constant disturbances and initial state. For non-ANCBI plants, viz. systems with exponentially unstable modes, the control law features the mentioned properties locally, viz. in bounded regions of initial states and disturbances. © 2000 Elsevier Science Ltd. All rights reserved.
  • Conference paper
    Hui SYR, Tang SC, Chung H, 2000,

    A low-profile low-power converter with isolated voltage output

    , Pages: 95-99

    In this paper, an isolated low-profile power converter using a coreless printed-circuit-board (PCB) transformer is described. The diameter of the coreless PCB transformer is merely 0.46cm. Because of the high frequency (8MHz) operation involved, the gate drive electronics has to be soft-switched in order to achieve high energy efficiency and reduce the gate drive power consumption. The very thin PCB used in the converter facilitates energy coupling from the primary winding to the secondary side of the transformer. The output voltage can be regulated and programmable. The converter's power output is about 0.5W with a typical transformer efficiency of 63%.
  • Journal article
    Frankowska H, Vinter RB, 2000,

    Existence of neighboring feasible trajectories: Applications to dynamic programming for state-constrained optimal control problems

    , JOURNAL OF OPTIMIZATION THEORY AND APPLICATIONS, Vol: 104, Pages: 21-40, ISSN: 0022-3239
  • Conference paper
    Antonelli R, Astolfi A, 2000,

    Nonlinear Proportional Integral Controls Robustly Stabilise Biological Reactors

    , IFAC Symposium on Advenced Control of Chemical Processes (2000), Pisa, Italy
  • Report
    Wisniewski R, Astolfi A, Bak T, Blanke M, Lima P, Spindler K, Tabuada P, Tavares Pet al., 2000,

    Satellite attitude control problem

    , Final report of the ESF Programme on Complex Systems (COSY), Publisher: Springer Verlag
  • Conference paper
    Astolfi A, Ortega R, 2000,

    Structure preserving stabilization of the angular velocity of a satellite

    , AIAA Conference on Nonlinear Problems in Aviation and Aerospace, Daytona Beach, FL
  • Conference paper
    Dejivises J, Green TC, 2000,

    A Combination Mode for a Unified Power Flow Controller in Fault Recovery and with Harmonic Filter

    , IEEE International Conference on Power System Technology (POWERCON 2000) 4th-7th December 2000, Pages: 679-684
  • Report
    Astolfi A, Ortega R, Sepulchre R, 2000,

    Stabilization and disturbance attenuation of nonlinear systems using dissipativity theory

    , Final report of the ESF Programme on Complex Systems (COSY), Publisher: Springer Verlag
  • Conference paper
    Sandells DW, Green TC, 2000,

    The chain cell PFC

    , 31st Annual IEEE Power Electronics Specialists Conference (PESC 2000), Publisher: IEEE, Pages: 955-960, ISSN: 0275-9306
  • Conference paper
    Kerrigan EC, Maciejowski JM, 2000,

    Invariant sets for constrained nonlinear discrete-time systems with application to feasibility in Model Predictive Control

    , 39th IEEE Conference on Decision and Control, Publisher: IEEE, Pages: 4951-4956, ISSN: 0743-1546
  • Conference paper
    Valtolina E, Astolfi A, 2000,

    Global regulation and local robust stabilization of chained systems

    , 39th Conference on Decision and Control, Sydney
  • Conference paper
    Gungah SK, Halikias GD, Jaimoukha IM, 2000,

    Maximally robust controllers for multivariable systems

    , Proc 39th IEEE Conference on Decision and Control, Pages: 595-600
  • Conference paper
    Astolfi A, Menini L, 2000,

    New examples in noninteracting control for Hamiltonian systems

    , IFAC Workshop on Lagrangian and Hamiltonian Methods for Nonlinear Control, Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: 145-150
  • Conference paper
    Prodanovic M, Green TC, Mansir H, 2000,

    A survey of control methods for three-phase inverters in parallel connection

    , IEE Power Electronics and Variable-Speed Drives Conference, Conf. Publ. 475, Pages: 472-477
  • Journal article
    Gungah SK, Halikias GD, Jaimoukha IM, 2000,

    Maximally robust controllers for multivariable systems

    , SIAM Journal on Control and Optimization, Vol: 38, Pages: 1805-1829
  • Conference paper
    Ortega R, Astolfi A, Bastin G, Rodriguez Het al., 2000,

    Stabilization of food-chain systems via energy balancing

    , 2000 American Control Conference, Chicago, IL
  • Journal article
    Clark JMC, Vinter RB, 2000,

    Flow Rate Control

    , Electronics Letters, Vol: 36, Pages: 1328-1329
  • Conference paper
    Frankowska H, Vinter RB, 2000,

    Existence of neighbouring feasible trajectories: Applications to dynamic programming for state constrained optimal control problems

    , 39th IEEE Conference on Decision and Control, Publisher: IEEE, Pages: 4618-4623, ISSN: 0743-1546
  • Conference paper
    Allwright JC, Manolescu C, 2000,

    Orthogonal Lyapunov transformations for discrete-time linear time-varying systems

    , Control 2000 Conference, Cambridge, October 2000
  • Conference paper
    Green TC, 2000,

    Control and Drive Electronics for PM Machines

    , IEE Colloquium on Permanent Magnet Materials and Drives
  • Book chapter
    Astolfi A, Colaneri P, 2000,

    Static output feedback stabilization: from linear to nonlinear and back

    , Nonlinear control in the year 2000, Editors: Isidori, Lamnabhi-Lagarrigue, Respndek, Publisher: Springer Verlag
  • Conference paper
    Kerrigan EC, Bemporad A, Mignone D, Morari M, Maciejowski JMet al., 2000,

    Multi-objective prioritisation and reconfiguration for the control of constrained hybrid systems

    , 2000 American Control Conference (ACC 2000), Publisher: IEEE, Pages: 1694-1698, ISSN: 0743-1619
  • Journal article
    Rampazzo F, Vinter RB, 2000,

    Degenerate Optimal Control Problems with State Constraints

    , SIAM Journal on Control and Optimization, Vol: 39, Pages: 989-1007
  • Book
    Vinter RB, 2000,

    Optimal Control

    , Boston, Publisher: Birkhauser
  • Conference paper
    Allwright JC, Giannopoulos A, Chambers JA, 2000,

    New block based equalisation algorithms

    , Proceedings of IEEE 2000 Symposium 'Adaptive systems for signal processing, communications and control', Lake Louise, Alberta, Canada, October 1-4, 2000, Pages: 207-212
  • Conference paper
    Clark JMC, Vinter RB, 2000,

    A Differential Dynamic Games Problem Arising in Surge Tank Control

    , Proc. UKACC Int. Conf. CONTROL 2000, Cambridge, Session 2D, 4-7 Sept. 2000
  • Journal article
    Pal BC, Coonick AH, Macdonald DC, 2000,

    Robust damping controller design in power systems with superconducting magnetic energy storage devices

    , IEEE Trans.Power Systems, Vol: 15, Pages: 320-325, ISSN: 0885-8950

    The decentralized design of low-order robust damping controllers is presented based on a weighted and normalized eigenvalue-distance minimization method (WNEDM) employing several superconducting magnetic energy storage (SMES) de,ices. These controllers are aimed at enhancing the damping of multiple inter-area modes in a large power system. This paper describes a comprehensive and systematic way of designing these controllers. Non-linear simulations further verify the robustness of the damping controllers for various operating conditions.

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