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  • 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.
  • 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
  • Journal article
    Ho BMT, Chung HSH, Hui SYR, 2004,

    An integrated inverter with maximum power tracking for grid-connected PV systems

    , Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC, Vol: 3, Pages: 1559-1565

    An inverter for grid-connected photovoltaic systems is presented in this paper. It can globally locate the maximum power point of the panel over wide insolation and feed the solar energy to the grid. Its structure mainly integrates a previously developed maximum point tracking method and output current shaping function into a buck-boost-derived converter and then inverts the shaped current through a grid frequency bridge to the grid. Instead of having a storage capacitor connecting in parallel with the converter output, series connection is used, so that the required capacitor voltage rating is lower than that in classical inverters. Most importantly, the inverter output current harmonics are less sensitive to the capacitor value. A 30W laboratory prototype has been built. The tracking capability, inversion efficiency, and large-signal responses at different insolations have been investigated. Detailed analysis on the inverter performance has been performed. The theoretical predictions are verified with the experimental results.
  • 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
    Angeli D, Sontag ED, Wang Y, Ingalls Bet al., 2004,

    Separation principles for input-output and integral-input-to-state stability

    , SIAM Journal on Control and Optimization, Vol: 43, Pages: 256-276, ISSN: 0363-0129
  • Journal article
    Jabr RA, Pal BC, 2004,

    Iteratively reweighted least-squares implementation of the WLAV state-estimation method

    , IEE P-GENER TRANSM D, Vol: 151, Pages: 103-108, ISSN: 1350-2360

    An implementation of the weighted least absolute value (WLAV) method for obtaining an estimate of the state of the power system is presented. Most of the known WLAV methods use some form of linear programming software to find the best estimate. The paper shows that it is possible to obtain a WLAV estimate by simply applying the Newton-Raphson method to the set of equations that yield the critical points. The resulting iterative scheme corresponds to solving a sequence of linear weighted least-squares (WLS) problems. The proposed implementation enables the use of well-known techniques of WLS estimation and, consequently, facilitates the integration of the WLAV function in an energy management system. Test results on standard IEEE test systems reveal that the proposed implementation is competitive with a standard WLAV algorithm that uses a state-of-the-art implementation of an interior-point method.
  • Journal article
    Pal BC, Chaudhuri B, Zolotas AC, Jaimoukha IMet al., 2004,

    Simultaneous stabilisation approach for power system damping control design through TCPAR employing global signals

    , IEE P-GENER TRANSM D, Vol: 151, Pages: 43-50, ISSN: 1350-2360

    A robust damping control design methodology for a thyristor controlled phase angle regulator using global signals is proposed based on the simultaneous stabilisation approach. The numerical design algorithm determines the controller parameters in order to guarantee closed-loop poles in the left half plane with preferential treatment to those corresponding to the inter-area modes. Plant models under different operating conditions are incorporated in the design formulation to achieve the desired performance robustness. A three-input/single-output controller is designed for the TCPAR to provide adequate damping to the critical inter-area modes of a study system model. Based on the observability of the inter-area modes, real power flows from remote locations are used as feedback stabilising signals. The damping performance of the controller is examined in the frequency and time domains and is found to be robust against varying power-flow patterns, nature of loads, tie-fine strengths and system non-linearities, including saturation.
  • Book chapter
    Angeli D, Sontag ED, 2004,

    Interconnections of monotone systems with steady-state characteristics

    , Optimal control, stabilization and nonsmooth analysis, LECTURE NOTES IN CONTROL AND INFORMATION, VOL. 301, Pages: 135-154
  • Journal article
    Weiss G, Zhong QC, Green TC, Liang Jet al., 2004,

    <i>H</i><SUP>∞</SUP> repetitive control of DC-AC converters in microgrids

    , IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 19, Pages: 219-230, ISSN: 0885-8993
  • 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
  • Conference paper
    Evangelou S, Limebeer DJN, Sharp RS, Smith MC, Evangelou S, Limebeer DJN, Sharp RS, Smith MCet al., 2004,

    Steering compensation for high-performance motorcycles (online)

    , Bath, Control 2004, 6 - 9 September 2004, University of Bath, UK, Publisher: -, Pages: 1-5
  • Conference paper
    Kaliora G, Astolfi A, 2004,

    On the stabilization of feedforward systems with bounded control

    , IFAC symposium on nonlinear control systems, Pages: 179-184, ISSN: 0178-2312
  • Conference paper
    Hernandez-Aramburo CA, Green TC, 2004,

    Fuel consumption minimisation of a micro-grid

    , New York, 39th annual meeting of the Industry-Applications-Society, Seattle, WA, 3 - 7 October 2004, Publisher: IEEE, Pages: 2063-2068
  • Conference paper
    Chaudhuri B, Pal B, 2004,

    Robust damping of multiple swing modes employing global stabilizing signals with a TCSC (Meeting abstract)

    , Denver, CO, USA, 2004 IEEE Power Engineering Society general meeting, 6 - 10 June 2004, Publisher: IEEE, Pages: 1709-1709
  • Conference paper
    Karagiannis D, Jiang ZP, Ortega R, Astolfi Aet al., 2004,

    Output feedback stabilization of a class of uncertain nonlinear systems

    , New York, American control conference, Boston, MA, 30 June - 2 July 2004, Publisher: IEEE, Pages: 3683-3688
  • Conference paper
    Lovera M, Astolfi A, 2004,

    Global magnetic attitude control of spacecraft

    , 43rd conference on decision and control; CDC 43, Nassau, Bahamas, Publisher: IEEE, Pages: 267-272
  • Journal article
    Astolfi A, Van der Schaft AJ, 2004,

    Guest editorial

    , EUROPEAN JOURNAL OF CONTROL, Vol: 10, Pages: 395-396, ISSN: 0947-3580
  • Book chapter
    Antoulas AC, Astolfi A, 2004,

    H[infinity]-norm approximation

    , Unsolved problems in mathematical systems and control theory, Editors: Blondel, Megretski, Oxford, Publisher: Princeton University Press, Pages: 267-270, ISBN: 9780691117485
  • Conference paper
    Laila DS, Astolfi A, 2004,

    A note on discrete-time stabilization of Hamiltonian systems

    , IFAC symposium on nonlinear control systems, Pages: 1247-1252, ISSN: 0178-2312
  • Conference paper
    Papakos V, Vinter RB, 2004,

    A structured robust optimal control technique

    , New York, 43rd IEEE conference on decision and control, Nassau, Bahamas, DEC 14 - 17 December 2004, Publisher: IEEE, Pages: 2279-2284
  • Report
    Allan R, Strbac G, Djapic P, Jarrett Ket al., 2004,

    Developing the P2/6 Methodology

    , Manchester, Publisher: University of Manchester, DG/CG/00023/REP, URN 04/1065 DTI
  • Conference paper
    Kerrigan EC, Alamo T, 2004,

    A convex parameterization for solving constrained min-max problems with a quadratic cost

    , American Control Conference, 30 June - 2 July 2004, Boston, MA, Publisher: Ieee, Pages: 2220-2221
  • Conference paper
    Luis D, Astolfi A, Kershenbaum LK, 2004,

    Design and implementation of nonlinear robust controllers for reactors with strongly exothermic reactions

    , AIChE Annual Meeting, Austin, TX
  • Conference paper
    Shvartsman I, Vinter RB, 2004,

    On the regularity of optimal controls for state constrained problems

    , 43rd conference on decision and control; CDC 43, Nassau, Bahamas, Publisher: IEEE, Pages: 2285-2290
  • Conference paper
    Acosta JA, Ortega R, Astolfi A, 2004,

    Interconnection and damping assignment passivity-based control of mechanical systems with underactuation degree one

    , New York, American control conference, Boston, MA, 30 Jun - 2 July 2004, Publisher: IEEE, Pages: 3029-3034
  • Conference paper
    Astolfi A, Lovera M, 2004,

    A novel architecture for magnetic control of gravity gradient satellites

    , 16th IFAC symposium on automatic control in aerospace
  • Conference paper
    Karagiannis D, Astolfi A, 2004,

    Nonlinear adaptive control of systems in feedback form: an alternative to adaptive backstepping

    , IFAC symposium on large scale systems: theory and applications, Pages: 71-76
  • Book chapter
    Lovera M, Astolfi A, 2004,

    Global spacecraft attitude control using magnetic actuators

    , Advances in dynamics and control, Editors: Sivasundaram, London, Publisher: Chapman & Hall/CRC, Pages: 1-13, ISBN: 9780415308526
  • Conference paper
    Soto D, Pena R, Gutierrez F, Green TCet al., 2004,

    A new power flow controller based on a bridge converter topology

    , Galway, Ireland, IEEE power electronics specialist conference (PESC 2004), Publisher: IEEE, Pages: 2540-2545, ISSN: 0275-9306

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