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  • Journal article
    Lee CK, Su YP, Hui SYR, 2011,

    , IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 26, Pages: 2936-2945, ISSN: 0885-8993
    • Cite
    • Citations: 45
  • Journal article
    Chaudhuri NR, Majumder R, Chaudhuri B, Pan Jet al., 2011,

    , IEEE TRANSACTIONS ON POWER DELIVERY, Vol: 26, Pages: 2774-2784, ISSN: 0885-8977
    • Cite
    • Citations: 136
  • Journal article
    Prieto-Araujo E, Bianchi FD, Junyent-Ferre A, Gomis-Bellmunt Oet al., 2011,

    , IEEE TRANSACTIONS ON POWER DELIVERY, Vol: 26, Pages: 2476-2485, ISSN: 0885-8977
    • Cite
    • Citations: 209
  • Journal article
    Trilla L, Gomis-Bellmunt O, Junyent-Ferre A, Mata M, Sanchez Navarro J, Sudria-Andreu Aet al., 2011,

    , IEEE TRANSACTIONS ON SUSTAINABLE ENERGY, Vol: 2, Pages: 509-519, ISSN: 1949-3029
    • Cite
    • Citations: 52
  • Journal article
    Bettiol P, Frankowska H, Vinter RB, 2011,

    , Journal of Differential Equations, Vol: 252, Pages: 1912-1933, ISSN: 1090-2732

    This paper concerns the validity of estimates on the distance of an arbitrary state trajectory from the set of state trajectories which lie in a given state constraint set. These so called distance estimates have wide-spread application in state constrained optimal control, including justifying the use of the Maximum Principle in normal form and establishing regularity properties of value functions. We focus on linear, L∞ distance estimates which, of all the available estimates have, so far, been the most widely used. Such estimates are known to be valid for general, closed state constraint sets, provided the functions defining the dynamic constraint are Lipschitz continuous, with respect to the time and state variables. We ask whether linear, L∞ distance estimates remain valid when the Lipschitz continuity hypothesis governing t-dependence of the data is relaxed. We show by counter-example that these distance estimates are not valid in general if the hypothesis of Lipschitz continuity is replaced by continuity. We also provide a new hypothesis, ‘absolute continuity from the left’, for the validity of linear, L∞ estimates. The new hypothesis is less restrictive than Lipschitz continuity and even allows discontinuous time dependence in certain cases. It is satisfied, in particular, by differential inclusions exhibiting non-Lipschitz t-dependence at isolated points, governed, for example, by a fractional-power modulus of continuity. The relevance of distance estimates for state constrained differential inclusions permitting fractional-power time dependence is illustrated by an example in engineering design, where we encounter an isolated, square-root type singularity, concerning the t-dependence of the data.
  • Journal article
    Lin D, Yan W, Hui SYR, 2011,

    , IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, Vol: 58, Pages: 4145-4152, ISSN: 0278-0046
    • Cite
    • Citations: 12
  • Journal article
    Zhong WX, Liu X, Hui SYR, 2011,

    , IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, Vol: 58, Pages: 4136-4144, ISSN: 0278-0046
    • Cite
    • Citations: 211
  • Journal article
    Lee CK, Li S, Hui SYR, 2011,

    , IEEE TRANSACTIONS ON SMART GRID, Vol: 2, Pages: 548-554, ISSN: 1949-3053
    • Cite
    • Citations: 66
  • Journal article
    Castro M, Pudjianto D, Djapic P, Strbac Get al., 2011,

    , IET GENERATION TRANSMISSION & DISTRIBUTION, Vol: 5, Pages: 850-859, ISSN: 1751-8687
  • Journal article
    Zhong WX, Choi WP, Ho WWC, Hui SYet al., 2011,

    , IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, Vol: 58, Pages: 3287-3297, ISSN: 0278-0046
  • Journal article
    Kondoh J, Shafiu A, Jenkins N, Pudjianto D, Strbac Get al., 2011,

    , ELECTRICAL ENGINEERING IN JAPAN, Vol: 176, Pages: 19-28, ISSN: 0424-7760
  • Journal article
    Mayne DQ, Kerrigan EC, van Wyk EJ, Falugi Pet al., 2011,

    , International Journal of Robust and Nonlinear Control, Vol: 21, Pages: 1341-1353, ISSN: 1099-1239

    This paper extends tube-based model predictive control of linear systems to achieve robust control of nonlinear systems subject to additive disturbances. A central or reference trajectory is determined by solving a nominal optimal control problem. The local linear controller, employed in tube-based robust control of linear systems, is replaced by an ancillary model predictive controller that forces the trajectories of the disturbed system to lie in a tube whose center is the reference trajectory thereby enabling robust control of uncertain nonlinear systems to be achieved.
  • Journal article
    Gomis-Bellmunt O, Junyent-Ferre A, Sumper A, Bergas-Jane Jet al., 2011,

    , IEEE Transactions on Power Systems, Vol: 26, Pages: 1632-1640, ISSN: 1558-0679

    A control scheme for wind farms based on synchronousgenerators connected to a single power converter ispresented. The scheme is applicable to HVDC interfaced offshoreor remote wind farms. The proposed control scheme is based oncomputing the optimal wind farm electrical frequency dependingon the different incoming wind speeds. The power converterregulates the system frequency by adjusting the power injected tothe HVDC circuit. Fault ride-through is also possible by reducingrapidly the injected active power. The proposed scheme is validatedby means of simulations with a wind farm composed of fourwind turbines.
  • Journal article
    Jones BL, Kerrigan EC, Morrison JF, Zaki TAet al., 2011,

    , International Journal of Control, Vol: 84, Pages: 1310-1325, ISSN: 1366-5820

    This article investigates the problem of obtaining a state-space model of the disturbance evolution that precedes turbulent flow across aerodynamic surfaces. This problem is challenging since the flow is governed by nonlinear, partial differential-algebraic equations for which there currently exists no efficient controller/estimator synthesis techniques. A sequence of model approximations is employed to yield a linear, low-order state-space model, to which standard tools of control theory can be applied. One of the novelties of this article is the application of an algorithm that converts a system of differential-algebraic equations into one of ordinary differential equations. This enables straightforward satisfaction of boundary conditions whilst dispensing with the need for parallel flow approximations and velocity–vorticity transformations. The efficacy of the model is demonstrated by the synthesis of a Kalman filter that clearly reconstructs the characteristic features of the flow, using only wall velocity gradient information obtained from a high-fidelity nonlinear simulation.
  • Journal article
    Howey DA, Bansal A, Holmes AS, 2011,

    , Smart Materials and Structures, Vol: 20, Pages: 1-12
  • Journal article
    Howell SD, Duck PW, Hazel A, Johnson PV, Pinto H, Strbac G, Proudlove N, Black Met al., 2011,

    , IMA JOURNAL OF MANAGEMENT MATHEMATICS, Vol: 22, Pages: 231-252, ISSN: 1471-678X
  • Journal article
    Howey DA, Holmes AS, Pullen KR, 2011,

    , IEEE T IND APPL, Vol: 47, Pages: 1716-1723, ISSN: 0093-9994
  • Journal article
    Gan CK, Mancarella P, Pudjianto D, Strbac Get al., 2011,

    , ELECTRIC POWER SYSTEMS RESEARCH, Vol: 81, Pages: 1363-1372, ISSN: 0378-7796
    • Cite
    • Citations: 31
  • Journal article
    Angeli D, Praly L, 2011,

    , IEEE TRANSACTIONS ON AUTOMATIC CONTROL, Vol: 56, Pages: 1582-1592, ISSN: 0018-9286
    • Cite
    • Citations: 37
  • Patent
    Trainer DR, Soto-Sanchez DE, Green TC, Merlin MMCet al., 2011,

    DC Network Active Filtering using VSC

    , WO 2,013,000,510
  • Journal article
    Chen W, Hui SYR, 2011,

    , IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 26, Pages: 1714-1722, ISSN: 0885-8993
    • Cite
    • Citations: 70
  • Journal article
    Took CC, Strbac G, Aihara K, Mandic DPet al., 2011,

    , RENEWABLE ENERGY, Vol: 36, Pages: 1754-1760, ISSN: 0960-1481
    • Cite
    • Citations: 74
  • Journal article
    Chang H, Astolfi A, Shim H, 2011,

    , AUTOMATICA, Vol: 47, Pages: 1271-1277, ISSN: 0005-1098
    • Cite
    • Citations: 11
  • Journal article
    Vinter RB, Bettiol P, 2011,

    Trajectories satisfying a state constraint: improved estimates and new non-degeneracy conditions

    , IEEE Transactions on Automatic Control, Vol: 56, Pages: 1090-1096

    For a state-constrained control system described by a differential inclusion and a single functional inequality state constraint, it is known that, under an `inward pointing condition', the $W^{1,1}$ distance of an arbitrary state trajectory to the set of state trajectories, which have the same left endpoint and which satisfy the state constraint, is linearly related to the state constraint violation. In this paper we show that, in situations where the state-constrained control system is described instead by a controlled differential equation, this estimate can be improved by replacing the $W^{1,1}$ distance on state trajectories by the Ekeland metric of the distance of the control functions. A counter-example reveals that a refinement of this nature is not in general valid for state constrained differential inclusions. Finally we show how the refined estimates may be used to establish new conditions for non-degeneracy of the state constrained Maximum Principle, in circumstances when the data depends discontinuously on the control variable.
  • Journal article
    Laila DS, Lovera M, Astolfi A, 2011,

    , AUTOMATICA, Vol: 47, Pages: 975-980, ISSN: 0005-1098
    • Cite
    • Citations: 27
  • Conference paper
    Hey J, Howey DA, Martinez-Botas R, Lamperth Met al., 2011,

    Transient thermal modelling of an Axial Flux Permanent Magnet (AFPM) machine with model parameter optimisation using a Monte Carlo method

    , Vehicle Thermal Management Systems VTMS 10, Publisher: IMechE
  • Journal article
    Ortega R, Praly L, Astolfi A, Lee J, Nam Ket al., 2011,

    , IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY, Vol: 19, Pages: 601-614, ISSN: 1063-6536
    • Cite
    • Citations: 149
  • Journal article
    Norman AK, Kerrigan EC, McKeon BJ, 2011,

    , JOURNAL OF FLUID MECHANICS, Vol: 675, Pages: 268-296, ISSN: 0022-1120
    • Cite
    • Citations: 17
  • Journal article
    Howey DA, Martinez-Botas RF, Lytton L, Cussons Bet al., 2011,

    , Transportation Research Part D, Vol: 6, Pages: 459-464
  • Journal article
    Couchman IJ, Kerrigan EC, Boehm C, 2011,

    , AUTOMATICA, Vol: 47, Pages: 761-768, ISSN: 0005-1098

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