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  • Conference paper
    Falugi P, Olaru S, Dumur D, 2008,

    Robust multi-model predictive control using LMIs

    , ISSN: 1474-6670

    This paper proposes a novel robust predictive control synthesis technique for constrained nonlinear systems based on linear matrix inequalities (LMIs) formalism. Local discrete-time polytopic models have been exploited for prediction of the system behavior. This design strategy can be applied to a wide class of nonlinear systems provided a suitable embedding is available. The devised procedure guarantees constraint satisfaction and asymptotic stability. The proposed result extends previous works by allowing different local descriptions of nonlinearity and uncertainty and by handling less conservative input constraints. The multimodel prediction shows significant improvements in terms of closed-loop performance and estimation of the feasibility domain. Copyright © 2007 International Federation of Automatic Control All Rights Reserved.
  • Journal article
    Ortega R, van der Schaft A, Castanos F, Astolfi Aet al., 2008,

    Control by Interconnection and Standard Passivity-Based Control of Port-Hamiltonian Systems

    , IEEE TRANSACTIONS ON AUTOMATIC CONTROL, Vol: 53, Pages: 2527-2542, ISSN: 0018-9286
  • Journal article
    Angeli D, Bliman P-A, 2008,

    Tight estimates for convergence of some non-stationary consensus algorithms

    , SYSTEMS & CONTROL LETTERS, Vol: 57, Pages: 996-1004, ISSN: 0167-6911
  • Journal article
    Gomis-Bellmunt O, Junyent-Ferre A, Sumper A, Bergas-Jane Jet al., 2008,

    Ride-Through Control of a Doubly Fed Induction Generator Under Unbalanced Voltage Sags

    , IEEE TRANSACTIONS ON ENERGY CONVERSION, Vol: 23, Pages: 1036-1045, ISSN: 0885-8969
  • Conference paper
    Xu Z, Green T, 2008,

    A Singular Value Decomposition Approach to Similarity Evaluation Between Servo Loops of CNC Machine Tools

    , ASME International Mechanical Engineering Congress and Exposition, Publisher: ASME, ISSN: 1087-1357
  • Journal article
    Strbac G, 2008,

    Demand side management: Benefits and challenges

    , ENERGY POLICY, Vol: 36, Pages: 4419-4426, ISSN: 0301-4215
  • Journal article
    Karagiannis D, Carnevale D, Astolfi A, 2008,

    Invariant Manifold Based Reduced-Order Observer Design for Nonlinear Systems

    , IEEE TRANSACTIONS ON AUTOMATIC CONTROL, Vol: 53, Pages: 2602-2614, ISSN: 0018-9286
  • Journal article
    Astolfi A, Karagiannis D, Ortega R, 2008,

    Towards applied nonlinear adaptive control

    , ANNUAL REVIEWS IN CONTROL, Vol: 32, Pages: 136-148, ISSN: 1367-5788
  • Journal article
    Evangelou S, Limebeer DJN, Rodriguez MT, 2008,

    Influence of Road Camber on Motorcycle Stability

    , JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME, Vol: 75, ISSN: 0021-8936
  • Journal article
    Pudjianto D, Ramsay C, Strbac G, 2008,

    Microgrids and virtual power plants: concepts to support the integration of distributed energy resources

    , PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY, Vol: 222, Pages: 731-741, ISSN: 0957-6509
  • Conference paper
    Falugi P, Olaru S, Dumur D, 2008,

    Explicit robust multi-model predictive control

    , Pages: 1868-1873

    The paper deals with robust predictive control based on a LMI approach. With respect to the well established case of linear models, with a global polytopic uncertainty, in the present approach the conservativeness reduction is assured by allowing different local descriptions of the uncertainty. The prediction model can thus be interpreted as a multi-model description of the plant to be controlled. The techniques is effective for a large class of nonlinear systems embedded into polytopic models. For the practical implementation the construction of suitable (explicit) descriptions of the control law are described upon concrete algorithms. © 2008 IEEE.
  • Journal article
    Su YP, Liu X, Hui SYR, 2008,

    Mutual inductance calculation of movable planar coils on parallel surfaces

    , PESC Record - IEEE Annual Power Electronics Specialists Conference, Pages: 3475-3481, ISSN: 0275-9306

    Recent developments of wireless battery charging platform have prompted the requirements to investigate the mutual inductance between a movable planar coil and the fixed planar coil on the charging platform. The wireless battery charging platform must allow the load to be placed anywhere on the charging surface. Therefore the relative position between the movable energy-receiving coil and the energy-transmitting coils on the charging platform must be flexible. In this paper, an extended formula is proposed for the mutual inductance calculation for two coaxial or non-coaxial planar spiral windings sandwiched between two double-layer substrates. It can quickly determine the mutual coupling of two planar windings that can have different relative positions and distance between them. This new calculation method provides a new and useful tool for determining the mutual inductance of a movable planar coil and the fixed planar coil on the wireless battery charging platform. The theory has been favorably tested and compared with practical measurements and also finite-element analysis. ©2008 IEEE.
  • Journal article
    Lee CK, Chan PCF, Hui SYR, 2008,

    Alternating stacked inductor for Mega-Hertz power converter and filtering applications

    , PESC Record - IEEE Annual Power Electronics Specialists Conference, Pages: 3021-3027, ISSN: 0275-9306

    In this paper, an alternating winding structure for the stacked inductor is studied for use in Mega-Hertz switching converter and filtering applications. This alternating stacked winding structure reduces the parasitic capacitance of a stacked inductor. Thus, the operating frequency range of the inductor is substantially extended. The equivalent capacitances of the alternating stacked inductors are estimated by energy consideration in an attempt to explain the relative magnitudes of the capacitances of the stacked inductors with similar but different structures. Both theoretical analysis and practical measurements have confirmed the bandwidth advantages of the alternating stacked inductors. ©2008 IEEE.
  • Journal article
    Hui SYR, Chung HSH, Qiu DY, 2008,

    Effective standby power reduction using non-dissipative single-sensor method

    , PESC Record - IEEE Annual Power Electronics Specialists Conference, Pages: 678-684, ISSN: 0275-9306

    This paper presents an implementation of the "single-sensor" method for controlling a power factor correction (PFC) circuit. The method eliminates lossy resistive feedback by deriving control variables such as the input and output voltages of the power converter via the switching action of the power MOSFET of the power converter. It can be applied directly to control the PFC circuit under all conditions. A simple technique is also introduced to overcome the sensing problem under the no-load condition. This proposed scheme requires only simple modifications of existing PFC control integrated circuits (IC) and can be extended to all other PFC control ICs. Practical results of an 80W PFC system for 88V to 265V operation from no-load to 100% load conditions under both steady-state and transient conditions are included to confirm the success of such implementation. The proposed method can in principle be applied to a wide range of switched mode power electronic systems for reduction of standby power. ©2008 IEEE.
  • Journal article
    Toh TT, Mitcheson PD, Holmes AS, Yeatman EMet al., 2008,

    A continuously rotating energy harvester with maximum power point tracking

    , Journal of Micromechanics and Microengineering, Vol: 18
  • Journal article
    Mitcheson PD, Yeatman EM, Rao GK, Holmes AS, Green TCet al., 2008,

    Energy Harvesting From Human and Machine Motion for Wireless Electronic Devices

    , Proceedings of the IEEE, Vol: 96, Pages: 1457-1486
  • Journal article
    Acosta JA, Ortega R, Astolfi A, Sarras Iet al., 2008,

    A constructive solution for stabilization via immersion and invariance: The cart and pendulum system

    , AUTOMATICA, Vol: 44, Pages: 2352-2357, ISSN: 0005-1098
  • Journal article
    Karagiannis D, Astolfi A, 2008,

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

    , SYSTEMS & CONTROL LETTERS, Vol: 57, Pages: 733-739, ISSN: 0167-6911
  • Journal article
    Barklund E, Pogaku N, Prodanovic M, Hernandez-Aramburo C, Green TCet al., 2008,

    Energy Management in Autonomous Microgrid Using Stability-Constrained Droop Control of Inverters

    , IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 23, Pages: 2346-2352, ISSN: 0885-8993
  • Journal article
    Liu X, Ng WM, Lee CK, Hui SYet al., 2008,

    Optimal operation of contactless transformers with resonance in secondary circuits

    , Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC, Pages: 645-650

    Contactless transformer is an essential element in inductive power transfer systems. To improve its efficiency performance, a resonant tank is normally formed at the secondary side by adding an external capacitor in series (SS) or in parallel (SP) with the secondary winding. In this paper, a mathematical analysis based on simplified circuit model is presented. It leads to the theory of the boundary frequency which can be used to determine the optimal operating range for SS and SP mode, respectively, from the efficiency point of view. Calculated and measured results have been given to verify the theory in a case study. © 2008 IEEE.
  • Journal article
    Ho WC, Lee CK, Liu X, Chan PKW, Hui SYR, Lee YSet al., 2008,

    A hybrid EMI filter with ultra-wide bandwidth

    , Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC, Pages: 676-681

    This paper describes an integrated active and passive planar electromagnetic-interference (EMI) filter structure with effective noise suppression over a very wide bandwidth. Such hybrid EMI filter pa ves the way input filter design for future mega-hertz switching power converters. This study shows that it has superior performance over traditional active filters and passive filters. Spectral results of a switching converter from 150kHz to 30MHz using various of active, passive and the proposed hybrid EMI filters have confirmed the validity and high performance of the hybrid EMI filter. © 2008 IEEE.
  • Conference paper
    Orukpe PE, Zheng X, Jaimoukha IM, Zolotas AC, Goodall RM, Orukpe PE, Zheng X, Jaimoukha IM, Zolotas A, Goodall RMet al., 2008,

    Model predictive control based on mixed H2/H∞ control approach for active vibration control of railway vehicles

    , Publisher: Taylor & Francis, Pages: 151-160

    This paper investigates the application of Model Predictive Control (MPC) technology based on mixed H2/H1 control approach for active suspension control of a railway vehicle, the aim being to improve the ride quality of the railway vehicle. Comparisons are made with more conventional control approaches, and the applicability of the linear matrix inequality approach is illustrated via the railway vehicle example.
  • Journal article
    Jones CN, Kerrigan EC, Maciejowski JM, 2008,

    On polyhedral projection and parametric programming

    , JOURNAL OF OPTIMIZATION THEORY AND APPLICATIONS, Vol: 138, Pages: 207-220, ISSN: 0022-3239
  • Journal article
    Pal BC, Mei F, 2008,

    On the modelling adequacy of the DFIG for small signal stability studies in power systems

    , IET Journal of Renewable Power Generation, Vol: 2, Pages: 181-190

    The dynamics of the doubly fed induction generator (DFIG) with a closed-loop control is analysed. The analysis provides explanations of the impact of the closed-loop control on the DFIG dynamics and relevant modelling requirements for power system stability studies. The discussion considers generic PI controllers for the regulation of rotor speed, reactive power and pitch angle. It is shown that for the closed-loop-controlled DFIG, a simplified model, whereby both stator and rotor dynamics are neglected, is adequate. In such model, stator and rotor variables are algebraic, that is, they change instantaneously and the modelled dynamics are those of the controllers and mechanical parts. The observations and conclusions are obtained from eigenvalue, participation factor and time-domain analysis.
  • Journal article
    Ray S, Venayagamoorthy GK, Chaudhuri B, Majumder Ret al., 2008,

    Comparison of adaptive critic-based and classical wide-area controllers for power systems

    , IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS PART B-CYBERNETICS, Vol: 38, Pages: 1002-1007, ISSN: 1083-4419
  • Journal article
    Su YP, Liu X, Hui SY, 2008,

    Extended theory on the inductance calculation of planar spiral windings including the effectof double-layer electromagnetic shield

    , IEEE Transactions on Power Electronics, Vol: 23, Pages: 2052-2061, ISSN: 0885-8993

    Recent progress on wireless planar battery charging platform highlights a requirement that the platform must be shielded underneath so that the electromagnetic (EM) flux will not leak through the bottom of the charging platform. The presence of the EM shield will inevitably alter the flux distribution and thus the inductance of the planar windings. In this paper, a theory of inductance calculation of spiral windings is extended to determine the inductance of planar spiral windings shielded by a double-layer planar EM shield which consists of a layer of soft magnetic material and a layer of conductive material. With the generalized equations, the impedance of the planar spiral windings on double-layer shielding substrate and the optimal thickness of shielding materials can be calculated accurately without using time-consuming finite-element method. Therefore, the influence of the double-layer electromagnetic shield on the inductance of the planar spiral windings can be analyzed. Simulations and measurements have been carried out for several shielding plates with different permeability, conductivity, and thickness. Both of the simulations and measurements of the winding inductance agree well with the extended theory. © 2008 IEEE.
  • Conference paper
    Ray S, Chaudhuri B, Majumder R, 2008,

    Appropriate signal selection for damping multi-modal oscillations using low order controllers

    , IEEE Power and Energy Society General Meeting
  • Journal article
    Angeli D, Chaillet A, 2008,

    Integral Input to State Stable Systems in Cascade

    , Systems & Control Letters, Vol: 57, Pages: 519-527
  • Journal article
    Casagrande D, Astolfi A, Parisini T, 2008,

    Global asymptotic stabilization of the attitude and angular rates of an underactuated non-simmetric rigid body

    , Automatica, Vol: 44, Pages: 1781-1789
  • Journal article
    Chaudry M, Jenkins N, Strbac G, 2008,

    Multi-time period combined gas and electricity network optimisation

    , ELECTRIC POWER SYSTEMS RESEARCH, Vol: 78, Pages: 1265-1279, ISSN: 0378-7796

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