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  • Journal article
    Pudjianto D, Ramsay C, Strbac G, 2007,

    Virtual power plant and system integration of distributed energy resources

    , IET Renewable Power Generation, Vol: 1, Pages: 10-16
  • Journal article
    PARISINI T, ZOPPOLI R, 1994,

    NEURAL NETWORKS FOR NONLINEAR STATE ESTIMATION

    , INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL, Vol: 4, Pages: 231-248, ISSN: 1049-8923
  • Journal article
    CASALINO G, MINCIARDI R, PARISINI T, 1991,

    DEVELOPMENT OF A NEW SELF-TUNING CONTROL ALGORITHM FOR FINITE AND INFINITE HORIZON QUADRATIC ADAPTIVE OPTIMIZATION

    , INTERNATIONAL JOURNAL OF ADAPTIVE CONTROL AND SIGNAL PROCESSING, Vol: 5, Pages: 405-425, ISSN: 0890-6327
  • Journal article
    Pogaku N, Prodanovic M, Green TC, 2007,

    Modeling, analysis and testing of autonomous operation of an inverter-based microgrid

    , IEEE Transactions on Power Electronics, Vol: 22, Pages: 613-625, ISSN: 1941-0107

    The analysis of the small-signal stability of conventionalpower systems is well established, but for inverter basedmicrogrids there is a need to establish how circuit and controlfeatures give rise to particular oscillatory modes and which ofthese have poor damping. This paper develops the modeling andanalysis of autonomous operation of inverter-based microgrids.Each sub-module is modeled in state-space form and all arecombined together on a common reference frame. The modelcaptures the detail of the control loops of the inverter but not theswitching action. Some inverter modes are found at relatively highfrequency and so a full dynamic model of the network (ratherthan an algebraic impedance model) is used. The complete modelis linearized around an operating point and the resulting systemmatrix is used to derive the eigenvalues. The eigenvalues (termed“modes”) indicate the frequency and damping of oscillatorycomponents in the transient response. A sensitivity analysis is alsopresented which helps identifying the origin of each of the modesand identify possible feedback signals for design of controllersto improve the system stability. With experience it is possible tosimplify the model (reduce the order) if particular modes arenot of interest as is the case with synchronous machine models.Experimental results from a microgrid of three 10-kW invertersare used to verify the results obtained from the model.
  • Journal article
    Bianchini G, Falugi P, Tesi A, Vicino Aet al., 2007,

    A convex lower bound for the real l<sub>2</sub> parametric stability margin of linear control systems with restricted complexity controllers

    , IEEE TRANSACTIONS ON AUTOMATIC CONTROL, Vol: 52, Pages: 514-520, ISSN: 0018-9286
  • Journal article
    Astolfi A, Karagiannis D, Ortega R, 2007,

    Stabilization of uncertain nonlinear systems via Immersion and Invariance

    , European Journal of Control, Vol: 13, Pages: 204-220
  • Journal article
    Jabr R A, Pal B C, 2007,

    A Conic Programming Approach for Static Voltage Stability Analysis in Radial Networks

    , IET Generation Transmission & Distribution, Pages: 203-208

    That the problem of computing the capacity limit of a radial distribution system can be formulated as a second-order cone program is shown. The implications of the conic programming formulation are 2-fold. First, the load capability of the radial system can be obtained using existing efficient implementations of polynomial time interior-point algorithms, thus avoiding the need for running a sequence of load flow solutions. Secondly, the conic objective function yields a voltage stability indicator (SI). This indicator quantifies the maximum percentage by which the current load profile can be uniformly increased before voltage collapse occurs. The proposed method is validated by computing the load capability and voltage SIs of 11 different distribution systems. Comparisons are carried out with five previously published voltage SIs
  • Journal article
    Prodanovic M, De Brabandere K, Van den Keybus J, Green TC, Driesn Jet al., 2007,

    Harmonic and reactive power compensation as ancillary services in inverter-based distributed generation

    , IET - Generation, Transmission and Distribution, Vol: 1, Pages: 432-438

    The introduction of distributed generation, DG, into low-voltage (LV) networks opens up the possibility of supplying ancillary services to aid network management and to maintain powerquality. DG itself can cause voltage magnitude difficulties when injecting real power into networks with high R/X ratios, but control of reactive power injection can help overcome this. Continuous control and support only at the voltage limit conditions (to avoid unnecessary reactive power flows in normal conditions) are explored. Relatively high-impedance LV networks are prone to harmonic distortion from nonlinear loads. A variety of control methods that emphasise either harmonic-line flows or local-voltage distortion are examined, and a compromise method based on resistance emulation is shown to be effective. Experimental results from a single-phase laboratory network and 2 kVA inverter are used to illustrate how these additional control functions can be integrated into the existing control scheme for real-power management. Decomposition of observed voltages and currents into harmonic terms that are phase synchronised to the grid voltage is a challenge in real-time systems. Kalman observers are used to achieve this with an additional advantage of avoiding explicit phase-locking while producing quadrature components useful in instantaneous calculation of reactive power and in providing feed-forward compensation terms.
  • Journal article
    Black M, Strbac G, 2007,

    Value of bulk energy storage for managing wind power fluctuations

    , IEEE TRANSACTIONS ON ENERGY CONVERSION, Vol: 22, Pages: 197-205, ISSN: 0885-8969
  • Journal article
    De Leenheer P, Sontag ED, Angeli D, 2007,

    Monotone chemical reaction networks

    , Journal of Mathematical Chemistry, Vol: 41, Pages: 295-314
  • Journal article
    Gross R, Heptonstall P, Leach M, Anderson D, Green TC, Skea Jet al., 2007,

    Renewables and the grid: understanding intermittency

    , Proceedings of the Institution of Civil Engineers - Energy, Vol: 160, Pages: 31-41

    This paper reviews the key issues and findings of the UK Energy Research Centre report on the costs and impacts of intermittent or variable renewable electricity-generating technologies. The relevant principles of managing electricity networks are examined and aspects that change when significant intermittent generation is added are analysed.The impacts and costs of intermittent generators can be quantified only in the context of the characteristics of the system of which they form part. The principal reasons why these impacts differ from one system to another are examined and explained. The evidence for likely impactsand costs in the UK, at intermittent penetration levels up to 20% of total electricity supplied, is analysed. The two main categories of impact are on system balancing and system reliability, and costs are quantified for these factors.Estimates are in the range of an additional £2–3/MWh for system balancing and £3–5/MWh for system reliability.
  • Journal article
    Astolfi A, 2007,

    A remark on an example by Teel-Hespanha with applications to cascaded systems

    , IEEE TRANSACTIONS ON AUTOMATIC CONTROL, Vol: 52, Pages: 289-293, ISSN: 0018-9286
  • Conference paper
    Astolfi A, Karagiannis D, Orgtega R, 2007,

    Stabilization of uncertain nonlinear systems via immersion and invariance

    , Pages: 204-220, ISSN: 0947-3580

    This paper presents a method for designing asymptotically stabilising and adaptive convtrol laws for uncertain nonlinear systems. The method relies upon the notions of system immersion and manifold invariance and, in principle, does not require the knowledge of a (control) Lyapunov function. The construction of the stabilising control laws resembles the procedure used in nonlinear regulator theory to derive the (invariant) output-zeroing manifold and its friend, and is well suited, for instance, in situations where we know a stabilising controller of a nominal reduced-order model, which we would like to robustify with respect to higher-order dynamics. In adaptive control problems the method yields stabilising schemes that counter the effect of the uncertain parameters adopting a robustness perspective. This is in contrast with most existing adaptive designs that (relying on certain matching conditions) treat these terms as disturbances to be rejected. The construction does not invoke certainty equivalence, nor requires a linear parameterisation. Furthermore, viewed from a Lyapunov perspective, it provides a procedure to add cross terms between the parameter estimates and the plant states. To illustrate the concepts presented in this paper we introduce several academic and physical examples, including a mechanical system with flexibility modes, an electromechanical system with parasitic actuator dynamics, and an adaptive, nonlinearly parameterised, visual servoing problem. © 2007 EUCA.
  • Journal article
    Djapic P, Ramsay C, Pudjianto D, Strbac G, Mutale J, Jenkins N, Allan Ret al., 2007,

    Taking an active approach

    , IEEE POWER & ENERGY MAGAZINE, Vol: 5, Pages: 68-77, ISSN: 1540-7977
  • Journal article
    Liu X, Hui SYR, 2007,

    Equivalent circuit modeling of a multilayer planar winding array structure for use in a universal contactless battery charging platform

    , IEEE Transactions on Power Electronics, Vol: 22, Pages: 21-29, ISSN: 0885-8993

    In this paper, an equivalent circuit model of a multilayer planar winding array structure that can be used as a universal contactless battery charging platform is presented. This model includes the mutual-inductive effects of partial overlaps of planar windings in the multilayer structure. It has been successfully simulated with PSpice and practically verified with measurements obtained from three prototypes. This circuit model forms the basis of an overall system model of the planar charging platform. It is demonstrated that model parameters can be derived from the geometry of the winding structure. Errors between the calculated and the measured results are found to be within a tolerance of 5%. © 2006 IEEE.
  • Conference paper
    Casson AJ, Yates DC, Patel S, Rodriguez-Villegas Eet al., 2007,

    An analogue bandpass filter realisation of the Continuous Wavelet Transform

    , Engineering in Medicine and Biology Society, 2007. EMBS 2007. 29th Annual International Conference of the IEEE, Publisher: IEEE, Pages: 1850-1854, ISSN: 1557-170X
  • Book chapter
    Casagrande D, Astolfi A, Parisini T, 2007,

    Switching-based Lyapunov Function and the Stabilization of a Class of Non-holonomic Systems

    , Hybrid systems: computation and control 2007, Publisher: Springer Verlag
  • Book chapter
    Casagrande D, Astolfi A, Parisini T, 2007,

    Achieving stability in non-holonomic systems by means of switched control laws

    , Taming Heterogeneity and Complexity of Embedded Control, Editors: Lamnabhi-Lagarrigue, Laghrouche, Loria, Panteley, Lamnabhi-Lagarrigue, Laghrouche, Loria, Panteley, Publisher: Hermes
  • Journal article
    Majumder R, Chaudhuri B, Pal BC, 2007,

    Implementation and test results of a wide-area measurement-based controller for damping interarea oscillations considering signal-transmission delay

    , IET GENER TRANSM DIS, Vol: 1, Pages: 1-7

    The paper describes the implementation of a centralised control-design scheme in a real-time laboratory-based dynamic simulator. A centralised multivariable-control algorithm is designed employing remote feedback signals considering delay in signal transmission. The transmitted signals can be used for multiple-swing-mode damping using a single controller. Such an algorithm is numerically intensive owing to the high controller size and the predictor that takes care of the delay in signal transmission. The performance of the proposed controller is demonstrated by practical implementation using a rapid-prototyping controller mounted on a PC-ATX. Results of the experimental tests are shown for a detailed model of the power system implemented using Linux PC-based multiprocessor technology.
  • Journal article
    Majumder R, Chaudhuri B, Pal B C, 2007,

    Implementation and test results of a wide area measurementbased controller for damping inter-area oscillations considering

    , IET Generation, Transmission & Distribution, Vol: 1, Pages: 1-7
  • Journal article
    Angeli D, Astolfi A, 2007,

    A tight small-gain theorem for not necessarily ISS systems

    , SYSTEMS & CONTROL LETTERS, Vol: 56, Pages: 87-91, ISSN: 0167-6911
  • Book chapter
    Angeli D, De Leenheer P, Sontag ED, 2007,

    A Petri net approach to persistence analysis in chemical reaction networks

    , BIOLOGY AND CONTROL THEORY: CURRENT CHALLENGES, LECTURE NOTES IN CONTROL AND INFORMATION SCIENCES, Vol. 357, Pages: 181-216, ISBN: 978-3-540-71987-8
  • Journal article
    Anaya-Lara O, Hughes F M, Jenkins N, Strbac Get al., 2007,

    Provision of a synchronising power characteristics on DFIG-based wind farms

    , IET Proceedings Generation, Transmission and Distribution, Vol: 1, Pages: 162-169
  • Journal article
    Zolotas AC, Chaudhuri B, Jaimoukha IM, Korba P, Jaimoukha IM, Zolotas AC, Chaudhuri B, Korba Pet al., 2007,

    A study on LQG/LTR control for damping inter-area oscillations in power systems

    , IEEE Transactions on Control Systems Technology, Vol: 15, Pages: 151-160, ISSN: 1063-6536
  • Book chapter
    Viola G, Ortega R, Banavar R, Acosta J A, Astolfi Aet al., 2007,

    Some Remarks on Interconnection and Damping Assignment Passivity Based Control of Mechanical Systems

    , Taming Heterogeneity and Complexity of Embedded Control, Editors: Lamnabhi-Lagarrigue, Laghrouche, Loria, Panteley, Publisher: Hermes
  • Journal article
    Goulart PJ, Kerrigan EC, 2007,

    Output feedback receding horizon control of constrained systems

    , INTERNATIONAL JOURNAL OF CONTROL, Vol: 80, Pages: 8-20, ISSN: 0020-7179
  • Conference paper
    Tan CW, Green TC, Hernandez-Aramburo CA, 2007,

    A current-mode controlled maximum power point tracking converter for building integrated photovoltaics

    , 12th European Conference on Power Electronics and Applications, Publisher: IEEE SERVICE CTR, Pages: 1144-1153
  • Conference paper
    Mazars E, Jaimoukha IM, Li Z, Zolotas ACet al., 2007,

    Fault detection and isolation filter design for systems subject to polytopic uncertainties

    , 15th Mediterranean Conference on Control and Automation, Publisher: IEEE, Pages: 1662-+, ISSN: 2325-369X
  • Journal article
    Evangelou S, Limebeer DJN, Sharp RS, Smith MCet al., 2007,

    Mechanical steering compensators for high-performance motorcycles

    , Journal of Applied Mechanics, Vol: 74, Pages: 332-346, ISSN: 1528-9036
  • Conference paper
    Terzija V, Elkalashy NI, Preston G, Stanojevic V, Strbac Get al., 2007,

    Detection of arcing faults: Modelling, simulation, testing and algorithms aspects

    , IEEE Lausanne Powertech, Publisher: IEEE, Pages: 1147-+

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