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  • Journal article
    Bottrell N, Prodanovic M, Green TC, 2013,

    Dynamic Stability of a Microgrid With an Active Load

    , IEEE Transactions on Power Electronics, Vol: 28, Pages: 5107-5119, ISSN: 1941-0107

    Rectifiers and voltage regulators acting as constant power loads form an important part of amicrogrid’s total load. In simplified form, they present a negative incremental resistance and beyondthat, they have control loop dynamics in a similar frequency range to the inverters that may supply amicrogrid. Either of these features may lead to a degradation of small-signal damping. It is known thatdroop control constants need to be chosen with regard to damping, even with simple impedance loads.Actively controlled rectifiers have been modelled in non-linear state-space form, linearised around anoperating point, and joined to network and inverter models. Participation analysis of the eigenvalues ofthe combined system identified that the low-frequency modes are associated with the voltage controllerof the active rectifier and the droop-controllers of the inverters. The analysis also reveals that whenthe active load DC-voltage controller is designed with large gains, the voltage controller of the inverterbecomes unstable. This dependency has been verified by observing the response of an experimentalmicrogrid to step changes in power demand. Achieving a well-damped response with a conservativestability margin does not compromise normal active rectifier design, but notice should be taken of theinverter-rectifier interaction identified.
  • Journal article
    Boyle DE, Yates DC, Yeatman EM, 2013,

    Urban Sensor Data Streams: London 2013

    , IEEE INTERNET COMPUTING, Vol: 17, Pages: 12-20, ISSN: 1089-7801
  • Conference paper
    Kuenzel S, Kunjumuhammed LP, Pal BC, 2013,

    Frequency Response Capability of the GB System in 2030

    , London, UK, 12th International Workshop on Large-scale Integration of Wind Power into Power Systems as well as on Transmission Networks for Offshore Wind Power Plants, Publisher: Energynautics GmbH
  • Journal article
    Bettiol P, Boccia A, Vinter RB, 2013,

    Stratified Necessary Conditions for Differential Inclusions with State Constraints

    , SIAM Journal on Control and Optimization, Vol: 51, Pages: 3903-3917, ISSN: 1095-7138

    The concept of stratified necessary conditions for optimal control problems, whose dynamic constraint is formulated as a differential inclusion, was introduced by F. H. Clarke. These are conditions satisfied by a feasible state trajectory that achieves the minimum value of the cost over state trajectories whose velocities lie in a time-varying open ball of specified radius about the velocity of the state trajectory of interest. Considering different radius functions stratifies the interpretation of “minimizer.” In this paper we prove stratified necessary conditions for optimal control problems involving pathwise state constraints. As was shown by Clarke in the state constraint-free case, we find that, also in our more general setting, the stratified necessary conditions yield generalizations of earlier optimality conditions for unbounded differential inclusions as simple corollaries. Some examples are provided, giving insights into the nature of the hypotheses invoked for the derivation of stratified necessary conditions and into the scope for their further refinement.
  • Conference paper
    Meisel J, Shabbir W, Evangelou SA, 2013,

    A Practical Control Methodology for Parallel Plug-In Hybrid Electric Vehicle Powertrains

    , The 9th IEEE Vehicle Power and Propulsion Conference (VPPC)
  • Conference paper
    Trovato G, Tindemans SH, Strbac G, 2013,

    Demand Response Contribution to Effective Inertia for System Security in the GB 2020 Gone Green Scenario

    , IEEE Innovative Smart Grid Technologies (ISGT) Europe 2013
  • Journal article
    Bettiol P, Vinter RB, 2013,

    Estimates on trajectories in a closed set with corners for (t,x) dependent data

    , Mathematical Control and Related Fields, Vol: 3, Pages: 245-267, ISSN: 2156-8472

    Estimates on the distance of a given process from the set of processes that satisfy a specified state constraint in terms of the state constraint violation are important analytical tools in state constrained optimal control theory; they have been employed to ensure the validity of the Maximum Principle in normal form, to establish regularity properties of the value function, to justify interpreting the value function as a unique solution of the Hamilton-Jacobi equation, and for other purposes. A range of estimates are required, which differ according the metrics used to measure the `distance' and the modulus θ(h) of state constraint violation h in terms of which the estimates are expressed. Recent research has shown that simple linear estimates are valid when the state constraint set A has smooth boundary, but do not generalize to a setting in which the boundary of A has corners. Indeed, for a velocity set F which does not depend on (t,x) and for state constraints taking the form of the intersection of two closed spaces (the simplest case of a boundary with corners), the best distance estimates we can hope for, involving the W1,1, metric on state trajectories, is a super-linear estimate expressed in terms of the h|log(h)| modulus. But, distance estimates involving the h|log(h)| modulus are not in general valid when the velocity set F(.,x) is required merely to be continuous, while not even distance estimates involving the weaker, Hölder modulus hα (with α arbitrarily small) are in general valid, when F(.,x) is allowed to be discontinuous. This paper concerns the validity of distance estimates when the velocity set F(t,x) is (t,x)-dependent and satisfy standard hypotheses on the velocity set (linear growth, Lipschitz x-dependence and an inward pointing condition). Hypotheses are identified for the validity of distance estimates, involving both the h|log(h)| and linear moduli, within the framework of control systems described by a controlled dif
  • Journal article
    Arif J, Ray S, Chaudhuri B, 2013,

    Multivariable Self-Tuning Feedback Linearization Controller for Power Oscillation Damping

    , IEEE Transactions on Control Systems Technology, Vol: 22, Pages: 1519-1526, ISSN: 1558-0865

    The objective of this brief is to design ameasurement-based self-tuning controller, which does not rely onaccurate models and deals with nonlinearities in system response.A special form of neural network (NN) model called feedbacklinearizable NN (FLNN) compatible with feedback linearizationtechnique is proposed for representation of nonlinear powersystems behavior. Levenberg–Marquardt (LM) is applied in batchmode to improve the model estimation. A time-varying feedbacklinearization controller (FBLC) is employed in conjunction withthe FLNN–LM estimator to generate the control signal. Validationof the performance of proposed algorithm is done throughthe modeling and simulating both normal and heavy loadingof transmission lines, when the nonlinearities are pronounced.Case studies on a large-scale 16-machine five-area power systemare reported for different power flow scenarios, to prove thesuperiority of proposed scheme against a conventional modelbasedcontroller. A coefficient vector for FBLC is derivedand used online at each time instant, to enhance the dampingperformance of controller.
  • Patent
    Evangelou SA, Arana C, Shabbir W, Shukla Aet al., 2013,

    Method and Apparatus for Power Source Control
  • Journal article
    Lee CK, Hui SYR, 2013,

    Reduction of Energy Storage Requirements in Future Smart Grid Using Electric Springs

    , IEEE TRANSACTIONS ON SMART GRID, Vol: 4, Pages: 1282-1288, ISSN: 1949-3053
  • Journal article
    Mueller MA, Angeli D, Allgoewer F, 2013,

    Economic model predictive control with self-tuning terminal cost

    , EUROPEAN JOURNAL OF CONTROL, Vol: 19, Pages: 408-416, ISSN: 0947-3580
  • Journal article
    Lee CK, Chaudhuri NR, Chaudhuri B, Hui SYRet al., 2013,

    Droop Control of Distributed Electric Springs for Stabilizing Future Power Grid

    , IEEE TRANSACTIONS ON SMART GRID, Vol: 4, Pages: 1558-1566, ISSN: 1949-3053
  • Journal article
    Astolfi A, 2013,

    The path of control

    , EUROPEAN JOURNAL OF CONTROL, Vol: 19, Pages: 340-340, ISSN: 0947-3580
  • Journal article
    Tahir F, Jaimoukha IM, 2013,

    Causal state-feedback parameterizations in robust model predictive control

    , Automatica, Vol: 49, Pages: 2675-2682

    In this paper, we investigate the problem of nonlinearity (and non-convexity) typically associated with linear state-feedback parameterizations in the Robust Model Predictive Control (RMPC) for uncertain systems. In particular, we propose two tractable approaches to compute an RMPC controller–consisting of both a causal, state-feedback gain and a control-perturbation component–for linear, discrete-time systems involving bounded disturbances and norm-bounded structured model-uncertainties along with hard constraints on the input and state. Both the state-feedback gain and the control-perturbation are explicitly considered as decision variables in the online optimization while avoiding nonlinearity and non-convexity in the formulation. The proposed RMPC controller–computed through LMI optimizations–is responsible for steering the uncertain system state to a terminal invariant set. Numerical examples from the literature demonstrate the advantages of the proposed scheme
  • Journal article
    Keliris C, Polycarpou MM, Parisini T, 2013,

    A Distributed Fault Detection Filtering Approach for a Class of Interconnected Continuous-Time Nonlinear Systems

    , IEEE TRANSACTIONS ON AUTOMATIC CONTROL, Vol: 58, Pages: 2032-2047, ISSN: 0018-9286
  • Journal article
    Tan S-C, Lee CK, Hui SYR, 2013,

    General Steady-State Analysis and Control Principle of Electric Springs With Active and Reactive Power Compensations

    , IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 28, Pages: 3958-3969, ISSN: 0885-8993
  • Conference paper
    P Kunjumuhammed L, C Pal B, Anaparthi K, F Thornhill Net al., 2013,

    Effect of wind penetration on power system stability
  • Conference paper
    Lot R, Evangelou SA, 2013,

    Lap Time Optimization of a Sports Series Hybrid Electric Vehicle

    , World Congress on Engineering 2013; WCE2013
  • Conference paper
    Trovato V, Tindemans SH, Strbac G, 2013,

    Controlling the synchronization and payback associated with the provision of frequency services by dynamic demand

    , 22nd International Conference on Electricity Distribution (CIRED 2013)
  • Journal article
    Chaudhuri NR, Chaudhuri B, 2013,

    Considerations Toward Coordinated Control of DFIG-Based Wind Farms

    , IEEE TRANSACTIONS ON POWER DELIVERY, Vol: 28, Pages: 1263-1270, ISSN: 0885-8977
  • Journal article
    Astolfi A, Longhi S, Tornambe A, 2013,

    Special issue on "periodic systems and robust control' dedicated to Osvaldo Maria Grasselli

    , INTERNATIONAL JOURNAL OF CONTROL, Vol: 86, Pages: 1201-1206, ISSN: 0020-7179
  • Journal article
    Pinuela M, Mitcheson PD, Lucyszyn S, 2013,

    Ambient RF energy harvesting in urban and semi-urban environments

    , Transactions on Microwave Theory and Techniques, Vol: 61, Pages: 2715-2726, ISSN: 0018-9480
  • Journal article
    Wee T-C, Astolfi A, Ming X, 2013,

    The Design and Control of a Bipedal Robot with Sensory Feedback

    , INTERNATIONAL JOURNAL OF ADVANCED ROBOTIC SYSTEMS, Vol: 10, ISSN: 1729-8814
  • Conference paper
    Fabozzi D, Thornhill NF, Pal BC, 2013,

    Frequency Restoration Reserve Control Scheme with Participation of Industrial Loads

    , Piscataway, NJ, IEEE PES PowerTech Grenoble 2013, Publisher: IEEE

    In order to accommodate larger amounts of renewable energy resources, whose power output is inherently unpredictable, there is an increasing need for frequency control power reserves. Loads are already used to provide replacement reserves, i.e. the slowest kind of reserves, in several power systems. This paper proposes a control scheme for frequency restoration reserves with participation of industrial loads. Frequency restoration reserves are required to change their active power within a time frame of tens of seconds to tens of minutes in response to a regulation signal. Industrial loads in many cases already have the capacity and capability to participate in this service. A mapping of their process constraints to power and energy demand is proposed in order to integrate industrial loads in existing control schemes. The proposed control scheme has been implemented in a 74-bus test system. Dynamic simulations show that industrial loads can be successfully integrated into the power system as frequency restoration reserves.
  • Conference paper
    P Kunjumuhammed L, C Pal B, F Thornhill N, 2013,

    A Test System Model for Stability Studies of UK Power Grid

    , IEEE PES PowerTech Grenoble 2013
  • Journal article
    Ionescu TC, Astolfi A, 2013,

    Families of moment matching based, structure preserving approximations for linear port Hamiltonian systems

    , Automatica, Vol: 49, Pages: 2424-2434, ISSN: 1873-2836

    In this paper we propose a solution to the problem of moment matching with preservation of the port Hamiltonian structure, in the framework of time-domain moment matching. We characterize several families of parameterized port Hamiltonian models that match the moments of a given port Hamiltonian system, at a set of finite interpolation points. We also discuss the problem of Markov parameters matching for linear systems as a moment matching problem for descriptor representations associated with the given system, at zero interpolation points. Solving this problem yields families of parameterized reduced order models that achieve Markov parameter matching. Finally, we apply these results to the port Hamiltonian case, resulting in families of parameterized reduced order port Hamiltonian approximations.
  • Journal article
    Hui SY, 2013,

    Planar Wireless Charging Technology for Portable Electronic Products and Qi

    , PROCEEDINGS OF THE IEEE, Vol: 101, Pages: 1290-1301, ISSN: 0018-9219
  • Journal article
    Egea-Alvarez A, Bianchi F, Junyent-Ferre A, Gross G, Gomis-Bellmunt Oet al., 2013,

    Voltage Control of Multiterminal VSC-HVDC Transmission Systems for Offshore Wind Power Plants: Design and Implementation in a Scaled Platform

    , IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, Vol: 60, Pages: 2381-2391, ISSN: 0278-0046
  • Journal article
    Alawieh A, Ortega R, Pillai H, Astolfi A, Berthelot Eet al., 2013,

    Voltage Regulation of a Boost Converter in Discontinuous Conduction Mode A SIMPLE ROBUST ADAPTIVE FEEDBACK CONTROLLER

    , IEEE CONTROL SYSTEMS MAGAZINE, Vol: 33, Pages: 55-65, ISSN: 1066-033X
  • Journal article
    Praly L, Carnevale D, Astolfi A, 2013,

    Dynamic Versus Static Weighting of Lyapunov Functions

    , IEEE TRANSACTIONS ON AUTOMATIC CONTROL, Vol: 58, Pages: 1557-1561, ISSN: 0018-9286

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