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  • Journal article
    Yan W, Hui SYR, 2004,

    Ageing effects on the stability performance of small wattage metal-halide (MH) lamps

    , Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC, Vol: 2, Pages: 978-983

    It is widely perceived that the ageing process of a MH lamp will shift the distribution of the acoustic resonance eigenfrequencies. However, there is no detailed research result so far to show how and to what extent the acoustic resonance frequency band will shift. The purpose of this paper is to carry out a study on the influence of operating time on the stability of small wattage MH lamps. Experimental results show that the ages of lamps do not affect the fundamental acoustic eigenfrequency values. The upper limit of highest acoustic resonance frequency bands where arc will become unstable is not affected by the ages of lamps. However, the ages of lamps do increase the instability inside the lamps. It makes lamp voltage increases significantly.
  • Journal article
    Cao XH, Hui SYR, 2004,

    Reliability improvement of high frequency electronic ballasts for metal halide lamps

    , Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC, Vol: 2, Pages: 997-1002

    An auxiliary resonant tank-protected high-frequency electronic ballast is proposed in this paper. Based on the steady state analysis of the series resonant converter, the operational characteristics of the ballast circuit for metal halide (MH) lamps under different conditions are examined, and then potential hazards to the ballast circuit are addressed. To avoid those dangers, an auxiliary resonant tank is used for protecting the ballast circuit under all operations. With this auxiliary resonant tank, the reliability of the ballast can be improved significantly. Feasibility of the proposal for the ballast circuit is verified by analytical and experimental results obtained from the 150W prototype ballast.
  • Journal article
    Lee STS, Chung HSH, Hui SYR, 2004,

    A novel electrode power profiler for dimmable ballasts using dc link voltage and switching frequency controls

    , IEEE Transactions on Power Electronics, Vol: 19, Pages: 847-853, ISSN: 0885-8993

    A novel electrode power profiler for dimmable ballasts using series-resonant parallel-loaded inverter is presented. Dimming of the fluorescent lamp is primarily based on reducing the dc link voltage. Variations of the electrode power (due to the decrease in the lamp current) during dimming is compensated by changing the switching frequency of the inverter, so that the resonant tank circuit current is also varied. The current gradient along the electrode, which is due to the distributed lamp current property on the electrode, is deliberated in formulating the power and voltage models of the electrode. As the electrode heating relies on two near-orthogonal current components including the lamp current and the resonant tank circuit current, a simple feedback control is developed to derive the electrode power and program the electrode power. Experimental results of a T8 36 W prototype are verified with theoretical predictions.
  • Journal article
    Allwright JC, Manolescu C, 2004,

    Stability assessment for linear time-varying discrete-time systems using orthogonal Lyapunov transformations

    , IEE PROCEEDINGS-CONTROL THEORY AND APPLICATIONS, Vol: 151, Pages: 259-263, ISSN: 1350-2379
  • Journal article
    Cao X, Yan W, Hui SYR, Chung HSHet al., 2004,

    Dimming control and characteristics of high-frequency operated metal halide lamps

    , IEEE Transactions on Power Electronics, Vol: 19, Pages: 854-861, ISSN: 0885-8993

    Dimming control and characteristics of high-frequency operated metal-halide (MH) lamps are described. Lamp performance based on two ballast topologies is compared. The dimming range and stability control of the MH lamps are addressed. Dimming range from 100% to about 30% has been achieved. It is found that the combination of ballast topology and dimming method can affect the dimming performance.
  • Journal article
    Berovic DP, Vinter RB, 2004,

    The application of dynamic programming to optimal inventory control

    , IEEE T AUTOMAT CONTR, Vol: 49, Pages: 676-685, ISSN: 0018-9286

    This paper concerns a class of deterministic impulse control problems, arising in inventory control. A notable feature of the problem formulation is the presence of an end-point constraint. In consequence, the value function may be discontinuous. Viability theory provides a characterization of the value function as the unique lower semicontinuous solution to a Bensoussan-Lions type quasi-variational inequality (QVI), suitably interpreted for nondifferentiable, extended valued functions. Yet there are few examples in the literature of the use of this analytical machinery. This paper provides such an example. The example, which concerns a problem for which the value function is neither everywhere finite valued nor continuously differentiable on the interior of its effective domain, illustrates what is involved in calculating subdifferentials and checking satisfaction of QVI (in a generalized sense). This paper also provides a summary of the underlying theory, and gathers in the Appendix proofs of key results.
  • Journal article
    Tse KK, Ho BMT, Chung HSH, Hui SYRet al., 2004,

    A comparative study of maximum-power-point trackers for photovoltaic panels using switching-frequency modulation scheme

    , IEEE Transactions on Industrial Electronics, Vol: 51, Pages: 410-418, ISSN: 0278-0046

    A comparative study of the maximum power point trackers using a switching-frequency modulation scheme (SFMS) for photovoltaic panels is presented. Some commonly used dc/dc converters, which are applied for the power conversion stage of those trackers, wili be examined. Method of locating the maximum power point (MPP) is based on injecting a small-signal sinusoidal perturbation into the switching frequency of the converter and comparing the ac component and the average value of the panel's terminal voltage. Apart from not requiring sophisticated computation of the panel power, this SFMS does not approximate the panel characteristics and can globally locate the MPP under wide insolation conditions. Tracking capability of the converters under investigation will be compared, using a 10-W solar panel with a controlled experimental setup. Theoretical predictions will be verified with experimental results. Operating characteristics at steady state and in large-signal change of the insolation (incident solar radiation) level will be studied.
  • Conference paper
    Galbraith GN, Vinter RB, 2004,

    Regularity of optimal controls for state constrained problems

    , Meeting on Variational Analysis and Applications held at the 1st AMS-UMI Joint Meeting, Publisher: SPRINGER, Pages: 305-317, ISSN: 0925-5001
  • Journal article
    Kerrigan EC, Maciejowski JM, 2004,

    Feedback min-max model predictive control using a single linear program: robust stability and the explicit solution

    , INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL, Vol: 14, Pages: 395-413, ISSN: 1049-8923
  • Journal article
    Weiss G, Zhong QC, Green TC, Liang Jet al., 2004,

    Erratum: H<sup>∞</sup> repetitive control of DC-AC converters in microgrids (IEEE Trans. Power Electron. (2004) 19, (219-230) DOI: 10.1109/TPEL.2004.825831)

    , IEEE Transactions on Power Electronics, Vol: 19, ISSN: 0885-8993
  • Journal article
    Weiss G, Zhong QC, Green TC, 2004,

    H-infinity repetitive control of dc-ac converters in microgrids (vol 19, pg 219, 2004)

    , IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 19, Pages: 567-567, ISSN: 0885-8993
  • Journal article
    Arutyunov AV, Vinter RB, 2004,

    A simple 'finite approximations' proof of the Pontryagin maximum principle under reduced differentiability hypotheses

    , SET-VALUED ANALYSIS, Vol: 12, Pages: 5-24, ISSN: 0927-6947
  • Conference paper
    Miao P, Holmes AS, Yeatman EM, Green TC, Mitcheson PDet al., 2004,

    Micro-machined variable capacitors for power generation

    , Bristol, 11th international conference on electrostatics, Heriot Watt Univ, Edinburgh, Scotland, 23 - 27 March 2003, Publisher: Iop Publishing Ltd, Pages: 53-58
  • Journal article
    Casavola A, Angeli D, Mosca E, 2004,

    Global regulation of input-saturated discrete-time linear systems subject to persistent disturbances

    , European Journal of Control, Vol: 10, Pages: 228-236
  • Journal article
    Angeli D, Mosca E, 2004,

    Adaptive switching supervisory control of nonlinear systems with no prior knowledge of noise bounds

    , Automatica, Vol: 40, Pages: 449-457, ISSN: 0005-1098
  • Journal article
    Angeli D, Sontag ED, 2004,

    Multi-stability in monotone input/output systems

    , Systems & Control Letters, Vol: 51, Pages: 185-202, ISSN: 0167-6911
  • Patent
    Green TC, Mansir H, Prodanovic M, 2004,

    Distributed control method

    , US2004037095US2004037095
  • Journal article
    Chaudhuri B, Pal BC, 2004,

    Robust damping of multiple swing modes employing global stabilizing signals with a TCSC

    , IEEE TRANSACTIONS ON POWER SYSTEMS, Vol: 19, Pages: 499-506, ISSN: 0885-8950
  • Conference paper
    Astolfi A, Bolzern P, Locatelli A, 2004,

    Path-tracking of a tractor-trailer vehicle along rectilinear and circular paths: A Lyapunov-based approach

    , 6th European Control Conference (ECC 01), Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Pages: 154-160, ISSN: 1042-296X
  • Journal article
    Angeli D, Sontag ED, Ferrell J, 2004,

    Detection of multistability, bifurcations, and hysteresis in a large class of biological positive feedback systems

    , Proceedings of the National Academy of Sciences, U.S.A, Vol: 101, Pages: 1822-1827, ISSN: 0027-8424
  • Conference paper
    Soto D, Pena R, Gutierrez F, Green TCet al., 2004,

    A new power flow controller based on a bridge converter topology

    , 35th Annual IEEE Power Electronics Specialists Conference (PESC 04), Publisher: IEEE, Pages: 2540-2545, ISSN: 0275-9306
  • Conference paper
    Franco E, Sacone S, Parisini T, 2004,

    Stable multi-model switching control of a class of nonlinear systems

    , American Control Conference, Publisher: IEEE, Pages: 1873-1878, ISSN: 0743-1619
  • Conference paper
    Franco E, Parisini T, Polycarpou MM, 2004,

    Cooperative control of discrete-time agents with delayed information exchange: a receding-horizon approach

    , 43rd IEEE Conference on Decision and Control, Publisher: IEEE, Pages: 4274-4279, ISSN: 0743-1546
  • Journal article
    Astolfi A, Van der Schaft AJ, 2004,

    Guest editorial

    , EUROPEAN JOURNAL OF CONTROL, Vol: 10, Pages: 395-396, ISSN: 0947-3580
  • Conference paper
    Clark JMC, Vinter RB, 2004,

    On the interpretation of non-anticipative control strategies in differential games and applications to flow control

    , Conference on Mathematical Control Theory (MCT 03), Publisher: SPRINGER-VERLAG BERLIN, Pages: 29-47, ISSN: 0170-8643
  • Journal article
    Rapaport A, Astolfi A, 2004,

    A remark on the stability of interconnected nonlinear systems

    , IEEE TRANSACTIONS ON AUTOMATIC CONTROL, Vol: 49, Pages: 120-124, ISSN: 0018-9286
  • Journal article
    Weiss G, Zhong QC, Green TC, Liang Jet al., 2004,

    H-infinity repetitive control of DC-AC converters in microgrids

    , IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 19, Pages: 219-230, ISSN: 0885-8993
  • Conference paper
    Alessandri A, Baglietto M, Battistelli G, Parisini Tet al., 2004,

    New convergence conditions for receding-horizon state estimation of nonlinear discrete-time systems

    , 43rd IEEE Conference on Decision and Control, Publisher: IEEE, Pages: 2094-2099, ISSN: 0743-1546
  • Journal article
    Qiu D, Hui SYR, Chung HSH, 2004,

    Some practical issues related to inductor model in single-sensor measurement technique

    , PESC Record - IEEE Annual Power Electronics Specialists Conference, Vol: 2, Pages: 1443-1448, ISSN: 0275-9306

    A non-dissipative single-sensor measurement principle has previously been proposed as a simple and effective means for providing control variables for feedforward and/or feedback control and also for parameter estimation. This approach can reduce the number of sensors and eliminate the requirement of complex isolated feedback circuitry in many power electronic systems. In this paper, based on the high-frequency small-signal inductor model, the accuracy of the derived inductor voltage from single voltage sensor or single current sensor is addressed. As the voltage difference between the actual and estimated inductor voltage values can be estimated, it is feasible to check if compensation network in single-sensor measurement principle is necessary or not. Practical issues for measurement and calculation of inductor parameters are also included and explained in the paper.
  • Conference paper
    Chaudhuri B, Pal B, 2004,

    Robust damping of multiple swing modes employing global stabilizing signals with a TCSC

    , IEEE-Power-Engineering-Society General Meeting, Publisher: IEEE, Pages: 1709-1709

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