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  • 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.
  • 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
    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
  • 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
    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
    • Cite
    • Citations: 70
  • Journal article
    Zolotas AC, Chaudhuri B, Jaimoukha IM, 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
    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
  • 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
    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 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
  • 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
    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.
  • Conference paper
    Barnes M, Ventakaramanan G, Kondoh J, Lasseter R, Asano H, Hatziargyriou N, Oyarzabal J, Green Tet al., 2007,

    Real-world Microgrids - An overview

    , IEEE International Conference on System of Systems Engineering, Publisher: IEEE, Pages: 37-+
  • Conference paper
    Payyala SL, Green TC, 2007,

    An estimation of economic benefit values of DG

    , IEEE-Power-Engineering-Society General Meeting, Publisher: IEEE, Pages: 3794-3801, ISSN: 1932-5517
  • Conference paper
    Mayne DQ, Kerrigan EC, 2007,

    Tube-based robust nonlinear model predictive control

    , IFAC Symposium on Nonlinear Control Systems (NOLCOS 2007)
  • Journal article
    Su YP, Liu X, Hui SYR, 2007,

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

    , 2007 IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE, VOLS 1-6, Pages: 3022-3028, ISSN: 0275-9306
  • Journal article
    Liu X, Lee CK, Hui SYR, 2007,

    An integrated planar EMI filter for ultra-high frequency power converters

    , 2007 IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE, VOLS 1-6, Pages: 1528-1534, ISSN: 0275-9306
  • Journal article
    Tam PW, Chung HSH, Hui SYR, 2007,

    Iterative behavioral modeling of charge-pump based electronic ballast-fluore scent lamp system

    , 2007 IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE, VOLS 1-6, Pages: 2279-2286, ISSN: 0275-9306
  • Journal article
    Chan PKW, Chung HSH, Hui SYR, 2007,

    Generalized theory of boundary control for single-phase multilevel inverter using second-order switching surface

    , 2007 IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE, VOLS 1-6, Pages: 1733-1739, ISSN: 0275-9306
  • Conference paper
    Mutale J, Strbac G, Pudjianto D, 2007,

    Methodology for cost reflective pricing of distribution networks with distributed generation

    , IEEE-Power-Engineering-Society General Meeting, Publisher: IEEE, Pages: 3707-3711, ISSN: 1932-5517
  • Conference paper
    Ferrari RMG, Parisini T, Polycarpou MM, 2007,

    A fault detection and isolation scheme for nonlinear uncertain discrete-time sytems

    , 46th IEEE Conference on Decision and Control, Publisher: IEEE, Pages: 5150-+, ISSN: 0743-1546
  • Conference paper
    Casagrande D, Astolfi A, Parisini T, 2007,

    Switching-based lyapunov function and the stabilization of a class of non-holonomic systems

    , 10th International Conference on Hybrid Systems - Computation and Control, Publisher: SPRINGER-VERLAG BERLIN, Pages: 664-+, ISSN: 0302-9743
  • Conference paper
    Casagrande D, Astolfi A, Parisini T, 2007,

    A globally stabilizing time-switching control strategy for an underactuated rigid body

    , 26th American Control Conference, Publisher: IEEE, Pages: 2548-+, ISSN: 0743-1619
  • Conference paper
    Ferrari RMG, Parisini T, Polycarpou MM, 2007,

    Distributed fault diagnosis with overlapping decompositions and consensus filters

    , 26th American Control Conference, Publisher: IEEE, Pages: 4884-+, ISSN: 0743-1619
    • Cite
    • Citations: 10
  • Conference paper
    McDonald JDF, Pal BC, Lang PD, 2007,

    Representation of distribution system reliability during network restoration and repair

    , IEEE-Power-Engineering-Society General Meeting, Publisher: IEEE, Pages: 4151-+, ISSN: 1932-5517
  • Conference paper
    Andrieu V, Praly L, Astolfi A, 2007,

    Asymptotic tracking of a state trajectory by output-feedback for a class of non linear systems

    , 46th IEEE Conference on Decision and Control, Publisher: IEEE, Pages: 2539-+, ISSN: 0743-1546
  • Conference paper
    Pudjianto D, Strbac G, Mutale J, 2007,

    Access and pricing of distribution network with distributed generation

    , IEEE-Power-Engineering-Society General Meeting, Publisher: IEEE, Pages: 4547-+, ISSN: 1932-5517
  • Conference paper
    Yates DC, Casson AJ, Rodriguez-Villegas E, 2007,

    Low power technology for wearable cognition systems

    , BERLIN, 3rd International Conference on Foundation of Augmented Cognition, Publisher: SPRINGER-VERLAG, Pages: 127-136, ISSN: 0302-9743

    This paper analyses a key tradeoff behind miniature devices intended to monitor cognition-related parameters. These devices are supposed to be worn by people that would otherwise be carrying on a normal life and this factor imposes important constraints in the design. They have to be wireless, wearable, discrete, low maintenance and reliable. In order to reduce power intelligence will be built into the sensors aiming to reduce the data transmission to only that information that it is strictly necessary. This intelligence will be in the form of an algorithm which will be required to be implemented in electronic circuits as part of the system. The complexity of the algorithm affects the complexity of the electronics and hence the power consumption. This, in turn affects the size of the battery and the overall size of the device. For the sensor to be low maintenance the device must operate for extended periods from the battery, adding more constraints to the power consumption of the electronic circuits. The battery must be kept small so that the overall size of the device is small and lightweight enough to be worn on the body and the more discrete the device the higher consumer compliance. A tradeoff has to be met between the algorithm complexity, the power consumption of the electronics required to realize the latter, the power consumption required to transmit data and the battery size and lifetime.

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