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  • Conference paper
    Segundo Sevilla FR, Jaimoukha I, Chaudhuri B, Korba Pet al., 2012,

    Fault-tolerant Wide-area Control for PowerOscillation Damping

    , IEEE PES General Meeting 2012
  • Journal article
    Lin D, Yan W, Zissis G, Hui SYRet al., 2012,

    Methodology for developing a low-pressure discharge lamp model with electron density variation and ambipolar diffusion

    , IET SCIENCE MEASUREMENT & TECHNOLOGY, Vol: 6, Pages: 229-237, ISSN: 1751-8822
  • Journal article
    Luis Dominguez-Garcia J, Gomis-Bellmunt O, Trilla-Romero L, Junyent-Ferre Aet al., 2012,

    Indirect vector control of a squirrel cage induction generator wind turbine

    , COMPUTERS & MATHEMATICS WITH APPLICATIONS, Vol: 64, Pages: 102-114, ISSN: 0898-1221
  • Conference paper
    Kuenzel S, Kunjumuhammed LP, Pal BC, Erlich Iet al., 2012,

    Wind Power Plants Inertial Response Capability Considering Wake Effect

    , 11th International Workshop on Large-Scale Integration of Wind Power into Power Systems as well as on Transmission Networks for Offshore Wind Power Plants, Lisbon
  • Journal article
    Su Y, Liu X, Lee CK, Hui SYRet al., 2012,

    On the Relationship of Quality Factor and Hollow Winding Structure of Coreless Printed Spiral Winding (CPSW) Inductor

    , IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 27, Pages: 3050-3056, ISSN: 0885-8993
  • Conference paper
    Pinuela M, Yates DC, Mitcheson PD, Lucyszyn Set al., 2012,

    Current State of Research at Imperial College London in RF Harvesting and Inductive Power Transfer

    , 2nd International Workshop on Wireless Energy Transport and Harvesting, Pages: 1-4

    This paper presents simulation and experimental results for ambient RF energy harvesting and Inductive Power Transfer systems. End-to-end and dc-load efficiency measurements and calculations were performed to demonstrate the capabilities of both systems, respectively. An RF spectral survey was conducted across all the 270 underground stations in London. DTV, GSM900, GSM1800 and 3G were selected as the highest contributors and single banded rectennas were fabricated for all frequencies. Ground level measurements demonstrate that more than 50 stations have suitable channel power levels per band to allow ambient RF energy harvesting. Efficiencies of up to 40% were achieved with a single banded rectenna operating at GSM 900, and efficiencies higher than 20% were achieved for TV and 3G. Furthermore a high frequency, semi-resonant Class-E driver was used to transfer 60 W of power across a 30 cm distance with a dc-load efficiency of 66%.
  • Patent
    GREEN TC, MERLIN MMC, OKAEME N, TRAINER DR, otherset al., 2012,

    MODULAR MULTILEVEL CONVERTER
  • Journal article
    Bianchi FD, Egea-Alvarez A, Junyent-Ferre A, Gomis-Bellmunt Oet al., 2012,

    Optimal control of voltage source converters under power system faults

    , CONTROL ENGINEERING PRACTICE, Vol: 20, Pages: 539-546, ISSN: 0967-0661
    • Cite
    • Citations: 11
  • Journal article
    Angeli D, Kountouriotis P-A, 2012,

    A Stochastic Approach to "Dynamic-Demand" Refrigerator Control

    , IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY, Vol: 20, Pages: 581-592, ISSN: 1063-6536
  • Conference paper
    Vasilakos C, Strbac G, Pudjianto D, Gammons S, Druce R, Moreno Ret al., 2012,

    European Transmission Tariff Harmonization: A Modeling Analysis

    , 9th International Conference on the European Energy Market EEM12
  • Journal article
    Falugi P, Kountouriotis P-A, Vinter RB, 2012,

    Differential Games Controllers That Confine a System to a Safe Region in the State Space, With Applications to Surge Tank Control

    , IEEE Transactions on Automatic Control, Vol: 57, Pages: 2778-2788, ISSN: 1558-2523

    Surge tanks are units employed in chemical processing to regulate the flow of fluids between reactors. A notable feature of surge tank control is the need to constrain the magnitude of the Maximum Rate of Change (MROC) of the surge tank outflow, since excessive fluctuations in the rate of change of outflow can adversely affect down-stream processing (through disturbance of sediments, initiation of turbulence, etc.). Proportional + Integral controllers, traditionally employed in surge tank control, do not take direct account of the MROC. It is therefore of interest to explore alternative approaches. We show that the surge tank controller design problem naturally fits a differential games framework, proposed by Dupuis and McEneaney, for controlling a system to confine the state to a safe region of the state space. We show furthermore that the differential game arising in this way can be solved by decomposing it into a collection of (one player) optimal control problems. We discuss the implications of this decomposition technique, for the solution of other controller design problems possessing some features of the surge tank controller design problem.
  • Journal article
    Tao X, Hui SYR, 2012,

    Dynamic Photoelectrothermal Theory for Light-Emitting Diode Systems

    , IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, Vol: 59, Pages: 1751-1759, ISSN: 0278-0046
  • Journal article
    Chen HT, Tao XH, Hui SYR, 2012,

    Estimation of Optical Power and Heat-Dissipation Coefficient for the Photo-Electro-Thermal Theory for LED Systems

    , IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 27, Pages: 2176-2183, ISSN: 0885-8993
  • Journal article
    Tao X, Chen H, Li SN, Hui SYRet al., 2012,

    A New Noncontact Method for the Prediction of Both Internal Thermal Resistance and Junction Temperature of White Light-Emitting Diodes

    , IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 27, Pages: 2184-2192, ISSN: 0885-8993
  • Journal article
    Ng WM, Lin DY, Hui SY, 2012,

    Design of a Single Ultra-Low-Loss Magnetic Ballast for a Wide Range of T5 High-Efficiency Fluorescent Lamps

    , IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, Vol: 59, Pages: 1849-1858, ISSN: 0278-0046
  • Journal article
    Lee CK, Zhong WX, Hui SYR, 2012,

    Effects of Magnetic Coupling of Nonadjacent Resonators on Wireless Power Domino-Resonator Systems

    , IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 27, Pages: 1905-1916, ISSN: 0885-8993
  • Journal article
    Azcondo FJ, Marcos Alonso J, Hui SYR, 2012,

    SPECIAL SECTION ON MODERN BALLAST TECHNOLOGY AND LIGHTING APPLICATIONS

    , IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, Vol: 59, Pages: 1686-1688, ISSN: 0278-0046
  • Journal article
    Li SN, Zhong WX, Chen W, Hui SYRet al., 2012,

    Novel Self-Configurable Current-Mirror Techniques for Reducing Current Imbalance in Parallel Light-Emitting Diode (LED) Strings

    , IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 27, Pages: 2153-2162, ISSN: 0885-8993
  • Journal article
    Datta S, Chakraborty D, Chaudhuri B, 2012,

    Partial Pole Placement with Controller Optimization

    , IEEE TRANSACTIONS ON AUTOMATIC CONTROL, Vol: 57, Pages: 1051-1056, ISSN: 0018-9286
  • Journal article
    Piplezadeh Y, Chaudhuri B, Green TC, 2012,

    Control Coordination Within a VSC-HVDC Link for Power Oscillation Damping: A Robust Decentralized Approach Using Homotopy

    , IEEE Transactions on Control Systems Technology

    Power oscillations can be damped effectivelythrough modulation of both active and reactive power of a voltage source converter based high voltage direct current link. The challenge, however, is how to coordinate the control action properly at the two ends of the link without using a centralised control scheme, which requires fast communication of control signals to remote actuator (converters) sites. A full centralised controller may result in a closed-loop performance worse than that of an open loop in case of a communication loss of feedback signal(s). Alternatively, with a block-diagonal control structure, the individual control loops are decoupled from each other, which is not only easier to implement in a decentralized way, but also shown to guarantee a certain level of performance. Here, the concept of homotopy is applied to obtain a single block-diagonal controller from a set of full controllers, individually designed to ensure specified closed-loop performance for a set of operating conditions. Simulation studies in DIgSILENT PowerFactory are carried out on two test systems to demonstrate both the robustness and control coordination in a decentralised framework.
  • Journal article
    Jerez JL, Kerrigan EC, Constantinides GA, 2012,

    A sparse and condensed QP formulation for predictive control of LTI systems

    , Automatica, Vol: 48, Pages: 999-1002, ISSN: 1873-2836

    The computational burden that model predictive control (MPC) imposes depends to a large extent on the way the optimal control problem is formulated as an optimization problem. We present a formulation where the input is expressed as an affine function of the state such that the closed-loop dynamics matrix becomes nilpotent. Using this approach and removing the equality constraints leads to a compact and sparse optimization problem to be solved at each sampling instant. The problem can be solved with a cost per interior-point iteration that is linear with respect to the horizon length, when this is bigger than the controllability index of the plant. The computational complexity of existing condensed approaches grow cubically with the horizon length, whereas existing non-condensed and sparse approaches also grow linearly, but with a greater proportionality constant than with the method presented here.
  • Journal article
    Clark JMC, Vinter RB, 2012,

    Stochastic exit time problems arising in process control

    , Stochastics-An International Journal of Probability and Stochastic Processes, Vol: 84, Pages: 667-681, ISSN: 1744-2516

    This paper concerns the problem of controlling a stochastic system, with small noise parameter, to prevent it leaving a safe region of the state space. Such problems arise in flow control and other areas. We consider a formulation of the problem, in which a control is sought, to maximize a cost which is related to the expected exit time, but modified to reduce the probability of an early exit, according to a specified level of risk aversion (‘risk sensitive’ stochastic control). Formally letting the noise parameter tend to zero, we find that the optimal control strategy for this problem coincides with the optimal feedback control strategy for a differential game. We identify a class of differential games arising in this way, the so called decomposable differential games, for which the optimal control strategy can be easily obtained and illustrate the proposed solution technique by applying it to a flow control problem arising in process systems engineering.
  • Conference paper
    Shabbir W, Evangelou SA, Arana C, 2012,

    Series hybrid electric vehicle supervisory control based on off-line efficiency optimization

    , 2012 IEEE International Electric Vehicle Conference
  • Patent
    Brandon NPB, Mitcheson PD, Yufit V, Howey DA, Offer GJet al., 2012,

    Battery Monitoring in Electric Vehicles, Hybrid Electric Vehicles, and other Applications

    , WO/2012/025706
  • Patent
    Evangelou SA, Dini D, De Meerschman O, Tocatlian A, Kneip C, Palas Cet al., 2012,

    Variable-geometry suspension apparatus and vehicle comprising such apparatus
  • Journal article
    Howey DA, Childs PRN, Holmes AS, 2012,

    Air-gap convection in rotating electrical machines

    , IEEE Transactions on Industrial Electronics, Vol: 59, Pages: 1367-1375, ISSN: 0278-0046

    This paper reviews convective heat transfer within the air-gap of both cylindrical and disc geometry rotating electrical machines, including worked examples relevant to fractional horsepower electrical machines. Thermal analysis of electrical machines is important because torque density is limited by maximum temperature. Knowledge of surface convective heat transfer coefficients is necessary for accurate thermal modelling for example using lumped parameter models. There exists a wide body of relevant literature, but much of it has traditionally been in other application areas, dominated by mechanical engineers, such as gas turbine design. Particular attention is therefore given to the explanation of the relevant non-dimensional parameters, and to the presentation of measured convective heat transfer correlations for a wide variety of situations from laminar to turbulent flow at small and large gap sizes for both radial flux and axial flux electrical machines.
  • Journal article
    Chen W, Hui SYR, 2012,

    Elimination of an Electrolytic Capacitor in AC/DC Light-Emitting Diode (LED) Driver With High Input Power Factor and Constant Output Current

    , IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 27, Pages: 1598-1607, ISSN: 0885-8993
  • Journal article
    Parisini T, 2012,

    Untitled

    , IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY, Vol: 20, Pages: 289-290, ISSN: 1063-6536
  • Journal article
    Manitsas E, Singh R, Pal BC, Strbac Get al., 2012,

    Distribution System State Estimation using an Artificial Neural Network Approach for Pseudo Measurement Modeling

    , IEEE Transactions on Power Systems, Vol: 27, Pages: 1888-1896-1896, ISSN: 0885-8950

    This paper presents an alternative approach topseudo measurement modeling in the context of distributionsystem state estimation (DSSE). In the proposed approach pseudomeasurements are generated from a few real measurements usingartificial neural networks (ANNs) in conjunction with typicalload profiles. The error associated with the generated pseudomeasurements is made suitable for use in the weighted leastsquares (WLS) state estimation by decomposition into severalcomponents through the Gaussian mixture model (GMM). Theeffect of ANN-based pseudo measurement modeling on thequality of state estimation is demonstrated on a 95-bus sectionof the U.K. generic distribution system (UKGDS) model
  • Patent
    Green TC, Merlin MMC, Okaeme N, Trainer DRet al., 2012,

    A Method of Voltage Source Converter Cell Voltage Balancing using Circulating Current

    , WO/2012/013248

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