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  • Journal article
    Guoyun C, Hill DJ, Hui R, 2005,

    Continuation of local bifurcations for power system differential-algebraic equation stability model

    , IEE Proceedings: Generation, Transmission and Distribution, Vol: 152, Pages: 575-580, ISSN: 1350-2360

    Information about the boundary of local bifurcations is important for utilities to guarantee the secure operation of power systems, and therefore local bifurcation analysis is a useful tool in power systems stability analysis. A new method is presented for calculating the multi-parameter singularity-induced, saddle-node and Hopf bifurcation boundary associated with the parameter-dependent differential-algebraic equations (DAE), which are used to model power systems dynamics. This method is based on the idea of the continuation method, which means that these three kinds of local bifurcations of DAE systems are expressed by appropriate nonlinear algebraic equations, which can be used to track the multi-parameter local bifurcation boundary directly by the continuation method from a known one-parameter local bifurcation point on the boundary, and thus it has the advantage of being a direct method as the continuation method itself inherently contains an iteration procedure during tracking the boundary point by point. Another advantage of this method is that it keeps the DAE form of the mathematical model of power systems and thus preserves the sparsity of the data structure. Several example power systems are used to illustrate the proposed method. © IEE, 2005.
  • Journal article
    Qiu DY, Hui SY, Chung HSH, 2005,

    Parameter monitoring of high-frequency electronically operated discharge lamp systems

    , IEEE Transactions on Power Electronics, Vol: 20, Pages: 948-952, ISSN: 0885-8993

    Discharge lamps require high ignition voltage from typically one to several kilovolts for cold-start, but have low onstate voltage of typically 100 V. For discharge arc monitoring purposes, it is difficult or uneconomical to implement voltage sensor to cover such a wide range of voltage. In this paper, a nonintrusive and electrically isolated method, based on the single-sensor principle, is used to derive the system parameters and variables for system monitoring and control purposes. Unlike the traditional resistive potential divider for voltage feedback, the proposed method is nondissipative. Only one coupled winding is used to derive the converter inductor voltage, from which the lamp power, lamp arc resistance and inverter dc link voltage can be accurately derived. The proposal is verified with good agreement between derived values and measurements in an electronic ballast-fluorescent lamp system. The proposal can be useful in applications in which sensing the voltage across the load is either difficult or costly. © 2005 IEEE.
  • Conference paper
    Goulart PJ, 2005,

    Relationships Between Affine Feedback Policies for Robust Control with Constraints

    , 16th IFAC World Congress on Automatic Control
  • Conference paper
    Goulart PJ, Kerrigan EC, 2005,

    Relationships between affine feedback policies for robust control with constraints
  • Journal article
    Stark BH, Green TC, 2005,

    A comparison of SOI Power Device Structures in Power Converters for High-Voltage, Low-Charge Electrostatic Micro-Generators

    , IEEE Trans on Electron Devives, Vol: 52, Pages: 1640-1648
  • Conference paper
    Rakovic S V, Mayne D Q, 2005,

    Regulation of discrete time systems with positive state and control constraints and bounded disturbances
  • Conference paper
    Goulart PJ, Kerrigan EC, 2005,

    An efficient decomposition-based formulation for robust control with constraints

    , 16 IFAC World Congress on Automatic Control
  • Conference paper
    Rakovic SV, Mayne DQ, Kerrigan EC, Kouramas KIet al., 2005,

    Optimized robust control invariant sets for constrained linear discrete-time systems
  • Conference paper
    Rakovic S V, Mayne D Q, 2005,

    A simple tube controller for efficient robust model predictive control of constrained linear discrete time systems subject to bounded disturbances
  • Conference paper
    Rakovic SV, Mayne DQ, 2005,

    Optimized robust control invariant sets for constrained linear discrete-time systems
  • Conference paper
    Grieder P, Rakovic S V, Morari M, Mayne D Qet al., 2005,

    Invariant sets for switched discrete time systems subject to bounded disturbances
  • Conference paper
    Hernandez-Aramburo CA, Green TC, Mugniot N, 2005,

    Fuel consumption minimization of a microgrid

    , 39th Annual Meeting of the IEEE-Industry-Applications-Society, Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Pages: 673-681, ISSN: 0093-9994
  • Journal article
    Sharma AS, Limebeer DJN, Jaimoukha IM, Lister JBet al., 2005,

    Modeling and control of TCV

    , IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY, Vol: 13, Pages: 356-369, ISSN: 1063-6536
  • Journal article
    Mok TK, Liu H, Ni Y, Wu FF, Hui Ret al., 2005,

    Tuning the fuzzy damping controller for UPFC through genetic algorithm with comparison to the gradient descent training

    , International Journal of Electrical Power and Energy Systems, Vol: 27, Pages: 275-283, ISSN: 0142-0615

    The unified power flow controller (UPFC) is the most versatile device in the flexible ac transmission systems (FACTS) which can provide superior power flow and voltage control through its main control. It can also improve power system dynamic performance through its supplementary control. In this paper, a fuzzy supplementary controller is designed for the UPFC to damp tie line power oscillation in the interconnected power systems. The parameters of the fuzzy damping controller (FDC) are optimized using the gradient descent training method and the genetic algorithm, respectively. The UPFC power frequency model, its main and supplementary control block diagrams and the formulation for the FDC parameter optimization are presented. Time simulation on a multi-machine inter-connected power system shows that the two optimization methods converge very well and yield very close FDC parameters and the designed FDC performs well in damping the tie line power oscillation under large disturbances. Computer simulation results also show that the FDC has better robustness under different system operation conditions than its conventional counterpart. © 2004 Elsevier Ltd. All rights reserved.
  • Journal article
    Chisci L, Falugi P, Zappa G, 2005,

    Predictive tracking control of constrained nonlinear systems

    , IEE PROCEEDINGS-CONTROL THEORY AND APPLICATIONS, Vol: 152, Pages: 309-316, ISSN: 1350-2379
  • Journal article
    Hui SYR, Ho WWC, 2005,

    A new generation of universal contactless battery charging platform for portable consumer electronic equipment

    , IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 20, Pages: 620-627, ISSN: 0885-8993
  • Conference paper
    Jaimoukha I M, Li Z H, Mazars, E F Met al., 2005,

    Linear Matrix Inequality Solution to the H_/Hinf Fault Detection Problem

    , IASTED International Conference on Control and Applications, Pages: 183-188
  • Journal article
    Anaparthi KK, Pal BC, El-Zobaidi H, 2005,

    Coprime factorisation approach in designing multi-input stabiliser for damping electromechanical oscillations in power systems

    , IEE P-GENER TRANSM D, Vol: 152, Pages: 301-308, ISSN: 1350-2360

    The application of loop shaping in H-infinity control design through a dual-input power system stabiliser (PSS) in a benchmark power system model is demonstrated. The PSS stabilises two key system poles contributing to critical electromechanical oscillations involving turbine generators and electrical network. The IEEE First Benchmark Model has been considered in this study to demonstrate the effectiveness of the control. A linearised model of the system is pre- and post-compensated using loop-shaping approach. The problem of robust stabilisation of a normalised coprime factor plant description is formulated into a generalised H-infinity problem and the solution is obtained analytically. The performance of the controller shows robustness to electromechanical modes, which were otherwise very poorly damped or undamped depending on operating conditions. The robustness is further validated in Simulink, including nonlinearities and device saturation limits.
  • Journal article
    Mayne DQ, Rakovic S, 2005,

    Model predictive control of constrained piecewise affine discrete-time systems (vol 13, pg 261, 2003)

    , INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL, Vol: 15, Pages: 291-291, ISSN: 1049-8923
  • Journal article
    Falugi P, Giarre L, Zappa G, 2005,

    Approximation of the feasible parameter set in worst-case identification of Hammerstein models

    , Automatica, Vol: 41, Pages: 1017-1024, ISSN: 1873-2836

    The estimation of the Feasible Parameter Set (FPS) for Hammerstein models in a worst-case setting is considered. A bounding procedure is determined both for polytopic and ellipsoidic uncertainties. It consists in the projection of the FPS of the extended parameter vector onto suitable subspaces and in the solution of convex optimization problems which provide Uncertainties Intervals of the model parameters. The bounds obtained are tighter than in the previous approaches.
  • Journal article
    Rakovic SV, Kerrigan EC, Kouramas KI, Mayne DQet al., 2005,

    Invariant approximations of the minimal robust. positively invariant set

    , IEEE TRANSACTIONS ON AUTOMATIC CONTROL, Vol: 50, Pages: 406-410, ISSN: 0018-9286
  • Journal article
    Kaliora G, Astolfi A, 2005,

    On the stabilization of feedforward systems with bounded control

    , SYSTEMS & CONTROL LETTERS, Vol: 54, Pages: 263-270, ISSN: 0167-6911
  • Journal article
    Zhang XD, Parisini T, Polycarpou MM, 2005,

    Sensor bias fault isolation in a class of nonlinear systems

    , IEEE TRANSACTIONS ON AUTOMATIC CONTROL, Vol: 50, Pages: 370-376, ISSN: 0018-9286
  • Journal article
    Green TC, Marks JH, 2005,

    Control techniques for active power filters

    , IEE PROCEEDINGS-ELECTRIC POWER APPLICATIONS, Vol: 152, Pages: 369-381, ISSN: 1350-2352
  • Journal article
    Chan SSM, Chung HSH, Hui SYR, 2005,

    A lamp power control scheme for dimmable electronic ballasts to minimize the temperature effect on the lamp brightness

    , IEEE Power Electronics Letters, Vol: 3, Pages: 34-39, ISSN: 1540-7985

    A hybrid lamp power control scheme for dimmable electronic ballasts is proposed. Apart from adjusting the brightness of the lamp, the proposed method can also minimize the ambient temperature effect on light output. Instead of regulating the lamp current, the proposed method is based on regulating the power supplying the lamp. First, the dimming operation is achieved by regulating the dc voltage at the ballast inverter input. Second, variation of the lamp power (due to the temperature effect) is regulated by sensing the inverter average input current to adjust the switching frequency of the inverter. An 18 W prototype has been built and tested. The lamp power and luminous output of the prototype at the ambient temperature from 5°C to 35° C have been studied. © 2005 IEEE.
  • Journal article
    Shafiu A, Jenkins N, Strbac G, 2005,

    Measurement Location for State Estimation of Distribution Networks with Generation

    , IEE Proceedings on Generation, Transmission and Distribution, Vol: 152, Pages: 240-246
  • Journal article
    Majumder R, Chaudhuri B, Pal BC, 2005,

    A probabilistic approach to model-based adaptive control for damping of interarea oscillations

    , IEEE TRANSACTIONS ON POWER SYSTEMS, Vol: 20, Pages: 367-374, ISSN: 0885-8950
  • Journal article
    Allwright JC, Astolfi A, Wong HP, 2005,

    A note on asymptotic stabilization of linear systems by periodic,piecewise constant, output feedback

    , AUTOMATICA, Vol: 41, Pages: 339-344, ISSN: 0005-1098
  • Journal article
    Jaimoukha IM, El-Zobaidi H, Limebeer DJN, Shah Net al., 2005,

    Controller reduction for linear parameter-varying systems with a priori bounds

    , AUTOMATICA, Vol: 41, Pages: 273-279, ISSN: 0005-1098
  • Journal article
    Mayne DQ, Seron MM, Rakovic SV, 2005,

    Robust model predictive control of constrained linear systems with bounded disturbances

    , AUTOMATICA, Vol: 41, Pages: 219-224, ISSN: 0005-1098

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