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  • Conference paper
    Astolfi A, Praly L, 2003,

    Global complete observability and output-to-state stability imply the existence of a globally convergent observer

    , New York, 42nd IEEE conference on decision and control, Maui, HI, 9 - 12 December 2003, Publisher: IEEE, Pages: 1562-1567
  • Conference paper
    Chaudhuri B, Pal BC, 2003,

    Robust damping of inter-area oscillations through controllable phase shifters using global signals

    , New York, IEEE-Power-Engineering-Society general meeting, Toronto, Canada, 13 - 17 July 2003, Publisher: IEEE, Pages: 1673-1679
  • Journal article
    Yan W, Hui SYR, 2002,

    A universal PSpice model for HID lamps

    , Conference Record - IAS Annual Meeting (IEEE Industry Applications Society), Vol: 2, Pages: 1475-1482, ISSN: 0197-2618

    Based on the physical laws of plasma discharge, a simplified but accurate model that can easily be implemented in PSpice is presented. This model does not require data from lamp manufacturers. Its parameters can be determined from external measurements of the lamps under operation. The HID lamp model has been tested in a 50W mercury HID lamp and compared with measurements. Experimental results have confirmed that the model is accurate for both low and high frequency operation.
  • Journal article
    Arcak M, Angeli D, Sontag E, 2002,

    A unifying integral ISS framework for stability of nonlinear cascades

    , SIAM Journal on Control and Optimization, Vol: 40, Pages: 1888-1904, ISSN: 0363-0129

    We analyze nonlinear cascades in which the driven subsystem is integral input-to-state stable (ISS), and we characterize the admissible integral ISS gains for stability. This characterization makes use of the convergence speed of the driving subsystem and allows a larger class of gain functions when the convergence is faster. We show that our integral ISS gain characterization unifies different approaches in the literature which restrict the nonlinear growth of the driven subsystem and the convergence speed of the driving subsystem. The result is used to develop a new observer-based backstepping design in which the growth of the nonlinear damping terms is reduced.
  • Journal article
    Astolfi A, Colaneri P, 2002,

    A Hamilton-Jacobi setup for the static output feedback stabilization of nonlinear systems

    , IEEE TRANSACTIONS ON AUTOMATIC CONTROL, Vol: 47, Pages: 2038-2041, ISSN: 0018-9286
  • Journal article
    Angeli D, Nesic D, 2002,

    Inegral versions of ISS for sampled-data nonlinear systems via their approximate discrete time models

    , IEEE Transactions on Automatic Control, Vol: 47, Pages: 2033-2037
  • Journal article
    Culverhouse PF, Herry V, Ellis R, Williams R, Reguera B, González-Gil S, Umani S, Cabrini M, Parisini Tet al., 2002,

    Dinoflagellate categorisation by artificial neural network

    , SEA TECHNOLOGY, Vol: 43, Pages: 39-46, ISSN: 0093-3651
  • Journal article
    Tang SC, Hui SYR, Chung HSH, 2002,

    Evaluation of the shielding effects on printed-circuit-board transformers using ferrite plates and copper sheets

    , IEEE Transactions on Power Electronics, Vol: 17, Pages: 1080-1088, ISSN: 0885-8993

    This paper presents an effective shielding technique and a simple structure for printed-circuit-board (PCB) transformers. Performance of PCB transformers using the proposed shielding technique is evaluated using thin ferrite plates and copper sheets. Without affecting the transformer energy efficiency, the shielding method under investigation can achieve 28 dB shielding effectiveness (SE), which is much higher than the SE (about 4 dB) obtained by shielding the transformer windings with only two ferrite plates. The proposed PCB transformer structure is very simple and has high energy efficiency (>90%) for Megahertz operation.
  • Journal article
    Angeli D, Nesic D, 2002,

    A trajectory-based approach for the stability robustness of nonlinear systems with inputs

    , Mathematics of Control Signals and Systems, Vol: 15, Pages: 336-355
  • Journal article
    Tse KK, Ho MT, Chung HSH, Hui SYRet al., 2002,

    A novel maximum power point tracker for PV panels using switching frequency modulation

    , IEEE Transactions on Power Electronics, Vol: 17, Pages: 980-989, ISSN: 0885-8993

    A novel technique for efficiently extracting maximum power from photovoltaic (PV) panels is presented. The power conversion stage, which is connected between a PV panel and a load or bus, is a SEPIC or Cuk converter or their derived circuits operating in discontinuous inductor-current or capacitor-voltage mode. Method of locating the maximum power point (MPP) is based on injecting a small-signal sinusoidal perturbation into the switching frequency and comparing the ac component and the average value of the panel terminal voltage. Apart from not requiring any sophisticated digital computation of the panel power, the proposed technique does not approximate the panel characteristics and can globally locate the MPP under wide insolation conditions. The tracking capability has been verified experimentally with a 10 W solar panel under a controlled experimental setup. Performances under the steady state and in the large-signal change of the insolation level will be given.
  • Journal article
    Limebeer DJN, Sharp RS, Evangelou S, 2002,

    Motorcycle steering oscillations due to road profiling

    , JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME, Vol: 69, Pages: 724-739, ISSN: 0021-8936
  • Journal article
    Pal BC, 2002,

    Robust damping of interarea oscillations with unified power-flow controller

    , IEE P-GENER TRANSM D, Vol: 149, Pages: 733-738, ISSN: 1350-2360

    An H-infinity-mixed-sensitivity design of a damping device employing a unified-power-flow controller (UPFC) is presented. The problem is posed in the linear-matrix-inequality (LMI) framework. The controller design is aimed at providing adequate damping to interarea oscillations over a range of operating conditions. The results obtained in a two-area four-machine test system are seen to be very satisfactory both in the frequency domain and through nonlinear simulations.
  • Journal article
    Pal BC, 2002,

    Robust pole placement versus root-locus approach in the context of damping interarea oscillations in power systems

    , IEE P-GENER TRANSM D, Vol: 149, Pages: 739-745, ISSN: 1350-2360

    The merits of a robust low-order pole-placement method of damping-control design over a conventional root-locus method are discussed: both being aimed at providing adequate damping against interarea oscillations. The design is based on a weighted and normalised eigenvalue-distance-minimisation method (WNEDM) to obtain damping controllers employing Superconducting magnetic-energy-storage (SMES) devices in a study system. The WNEDM-based control guarantees adequate damping in the prefault and postfault cases. The damping performance of the controllers is compared with that obtained by the root-locus technique. The results show that the WNEDM-based control is preferred over root-locus-based control when the control efforts in each the same.
  • Journal article
    Ortega R, Astolfi A, Barabanov NE, 2002,

    Nonlinear PI control of uncertain systems: an alternative to parameter adaptation

    , SYSTEMS & CONTROL LETTERS, Vol: 47, Pages: 259-278, ISSN: 0167-6911
  • Journal article
    Soto D, Green TC, 2002,

    Comparison of high-power converter topologies for the implementation of FACTS controllers

    , IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, Vol: 49, Pages: 1072-1080, ISSN: 0278-0046
  • Journal article
    Qiu DY, Yip SC, Chung HSH, Hui SYRet al., 2002,

    Single current sensor control for single-phase active power factor correction

    , IEEE Transactions on Power Electronics, Vol: 17, Pages: 623-632, ISSN: 0885-8993

    This paper presents the realization of a boost-type active power factor corrector (APFC) using a single current sensor to sense the inductor current for input current shaping and output voltage regulation. Neither input voltage nor output voltage sensing is needed. The sensed inductor current is used for two main functions. The first one is for comparing with a sawtooth signal in order to shape the input current waveform. The second one is for determining the input and output voltages by processing the rate of change of the inductor current when the main switch is in on and off states, respectively. Compared with conventional APFCs, the proposed technique has several advantages. First, no dissipative voltage divider is required. Second, electrical isolation between the power conversion stage and the control stage can be achieved inherently. Finally, no complicated or sophisticated digital sampling and numerical computations are needed. The applicability and accuracy of the proposed technique have been studied experimentally. Steady-state behavior and large-signal response under output load disturbance are also investigated.
  • Journal article
    Pudjianto D, Ahmed S, Strbac G, 2002,

    Allocation of VAr support using LP and NLP based optimal power flows

    , IEE PROCEEDINGS-GENERATION TRANSMISSION AND DISTRIBUTION, Vol: 149, Pages: 377-383, ISSN: 1350-2360
  • Journal article
    Marks JH, Green TC, 2002,

    Predictive transient-following control of shunt and series active power filters

    , IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 17, Pages: 574-584, ISSN: 0885-8993
  • Journal article
    Tse KK, Chung HSH, Hui SYR, So HCet al., 2002,

    A comparative study of carrier-frequency modulation techniques for conducted EMI suppression in PWM converters

    , IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, Vol: 49, Pages: 618-627, ISSN: 0278-0046
  • Journal article
    Lee CK, Hui SYR, Chung HSH, 2002,

    A 31-level cascade inverter for power applications

    , IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, Vol: 49, Pages: 613-617, ISSN: 0278-0046
  • Journal article
    Astolfi A, Hsu L, Netto MS, Ortega Ret al., 2002,

    Two solutions to the adaptive visual servoing problem

    , IEEE TRANSACTIONS ON ROBOTICS AND AUTOMATION, Vol: 18, Pages: 387-392, ISSN: 1042-296X
  • Journal article
    Liew S, Strbac G, 2002,

    Maximising the Penetration of Wind Generation in Existing Distribution Systems

    , IEE Proceedings on Generation, Transmission and Distribution, Vol: 149, Pages: 256-262
  • Journal article
    Zhang XD, Polycarpou MA, Parisini T, 2002,

    A robust detection and isolation scheme for abrupt and incipient faults in nonlinear systems

    , IEEE TRANSACTIONS ON AUTOMATIC CONTROL, Vol: 47, Pages: 576-593, ISSN: 0018-9286
  • Journal article
    Astolfi A, Chhabra D, Ortega R, 2002,

    Asymptotic stabilization of some equilibria of an underactuated underwater vehicle

    , SYSTEMS & CONTROL LETTERS, Vol: 45, Pages: 193-206, ISSN: 0167-6911
  • Journal article
    Angeli D, Mosca E, 2002,

    Lyapunov-based switching supervisory control of nonlinear uncertain systems

    , IEEE Transactions on Automatic Control, Vol: 47, Pages: 500-505, ISSN: 0018-9286

    Switching supervisory control (SSC) algorithms was developed for nonlinear plants with uncertain parameters and subjected to unaccessible persistent disturbances of known maximum size. The algorithm provided that full state feedback was available and can be tailored for linear plant dynamics. A simulative example was presented which showed that the algorithm was capable to cope with slowly time-varying and piecewise constant parameters.
  • Journal article
    Angeli D, 2002,

    A Lyapunov approach to incremental stability properties

    , IEEE Transactions on Automatic Control, Vol: 47, Pages: 410-421, ISSN: 0018-9286

    This paper deals with several notions of incremental stability. In other words, the focus is on stability of trajectories with respect to one another, rather than with respect to some attractor. The aim is to present a framework for understanding such questions fully compatible with the well-known input-to-state stability (ISS) approach. Applications of the newly introduced stability notions are also discussed.
  • Journal article
    Zoppoli R, Sanguineti M, Parisini T, 2002,

    Approximating networks and extended Ritz method for the solution of functional optimization problems

    , JOURNAL OF OPTIMIZATION THEORY AND APPLICATIONS, Vol: 112, Pages: 403-440, ISSN: 0022-3239
  • Journal article
    Yan W, Hui SYR, Chung H, Cao XHet al., 2002,

    Genetic algorithm optimised high-intensity-discharge lamp model

    , Electronics Letters, Vol: 38, Pages: 110-112, ISSN: 0013-5194

    Based on the physical laws of plasma arc discharge, a simple and user-friendly high-intensity-discharge (HID) lamp model optimised by genetic algorithms has been developed. The proposed model can predict lamp terminal characteristics accurately for both low and high frequency operation. All model parameters can be obtained from simple terminal measurements of the HID lamps without manufacturers' confidential data. The proposed model provides a powerful tool for simulating the electrical behaviour of the HID lamps.
  • Journal article
    Cao X, Yan W, Hui SYR, Chung Het al., 2002,

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

    , PESC Record - IEEE Annual Power Electronics Specialists Conference, Vol: 3, Pages: 1155-1160, ISSN: 0275-9306

    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
    Lee STS, Chung HSH, Hui SYR, 2002,

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

    , PESC Record - IEEE Annual Power Electronics Specialists Conference, Vol: 1, Pages: 192-197, ISSN: 0275-9306

    A novel electrode power profiler for dimmable ballasts using series-resonant parallel-loaded inverter is presented. Dimming of fluorescent lamps and control of the electrode power are achieved by simultaneously adjusting the dc link voltage and the switching frequency of the inverter. 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. Reduction of the electrode power (due to the decrease in the lamp current) during dimming is compensated by increasing the switching frequency of the inverter, in order to increase the resonant tank circuit current. Experimental results of a T8 36W prototype are verified with theoretical predictions.

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