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  • Journal article
    Ionescu TC, Astolfi A, Colaneri P, 2014,

    Families of moment matching based, low order approximations for linear systems

    , SYSTEMS & CONTROL LETTERS, Vol: 64, Pages: 47-56, ISSN: 0167-6911
  • Conference paper
    Shabbir W, Evangelou SA, 2014,

    Efficiency analysis of a continuously variable transmission with linear control for a series hybrid electric vehicle

    , 19th World Congress of the International-Federation-of-Automatic-Control (IFAC), Publisher: ELSEVIER SCIENCE BV, Pages: 6264-6269, ISSN: 2405-8963
  • Journal article
    Kuenzel S, Kunjumuhhamed LP, Pal BC, Erlich Iet al., 2014,

    Impact of Wakes on Wind Farm Inertial Response

    , IEEE Transactions on Sustainable Energy, Vol: 5, Pages: 237-245, ISSN: 1949-3029
  • Conference paper
    Müller MA, Angeli D, Allgöwer F, 2014,

    Performance analysis of economic MPC with self-tuning terminal cost

    , Pages: 2845-2850, ISSN: 0743-1619

    In this paper, we further analyze an economic model predictive control (MPC) algorithm with self-tuning terminal cost, which was recently proposed in [1]. It is shown that if a generalized terminal region constraint instead of a generalized terminal equality constraint is used, improved closed-loop asymptotic average performance bounds can be obtained. In particular, in contrast to the results in [1], these bounds can be obtained a priori. We discuss how the necessary parameters for the generalized terminal region setting can be calculated, and we illustrate our findings with a numerical example. © 2014 American Automatic Control Council.
  • Journal article
    Dzafic I, Pal BC, Gilles M, Henselmeyer S, Sultanic Set al., 2014,

    Generalized π Fortescue Equivalent Admittance Matrix Approach to Power Flow Solution

    , IEEE Transactions on Power Systems, Vol: 29, Pages: 193-202, ISSN: 0885-8950

    This paper develops a generalized admittance matrix approach in Fortescue coordinate system to solve unbalanced/unsymmetrical distribution networks including different number of phases. This generalized Fortescue $pi$ equivalent is defined in this paper for solving the heterogeneous phase, and thus Fortescue, network model. The performance of the approach is demonstrated in different model networks with number of nodes ranging between 168 and 14200. It is found that the current iteration method exploiting the decoupling in admittance matrix in Fortescue coordinate is substantially faster than the typical unbalanced three-phase solution in phase domain. The method has a significant potential for application in real time active power network management.
  • Journal article
    Angeli D, Banaji M, Pantea C, 2014,

    COMBINATORIAL APPROACHES TO HOPF BIFURCATIONS IN SYSTEMS OF INTERACTING ELEMENTS

    , COMMUNICATIONS IN MATHEMATICAL SCIENCES, Vol: 12, Pages: 1101-1133, ISSN: 1539-6746
  • Journal article
    Agalgaonkar YP, Pal BC, Jabr RA, 2014,

    Distribution voltage control considering the impact of PV generation on tap changers and autonomous regulators

    , IEEE Transactions on Power Systems, Vol: 29, Pages: 182-192, ISSN: 0885-8950

    The uptake of variable megawatts from photovoltaics (PV) challenges distribution system operation. The primary problem is significant voltage rise in the feeder that forces existing voltage control devices such as on-load tap-changers and line voltage regulators to operate continuously. The consequence is the deterioration of the operating life of the voltage control mechanism. Also, conventional non-coordinated reactive power control can result in the operation of the line regulator at its control limit (runaway condition). This paper proposes an optimal reactive power coordination strategy based on the load and irradiance forecast. The objective is to minimize the number of tap operations so as not to reduce the operating life of the tap control mechanism and avoid runaway. The proposed objective is achieved by coordinating various reactive power control options in the distribution network while satisfying constraints such as maximum power point tracking of PV and voltage limits of the feeder. The option of voltage support from PV plant is also considered. The problem is formulated as constrained optimization and solved through the interior point technique. The effectiveness of the approach is demonstrated in a realistic distribution network model.
  • Journal article
    Jabr RA, Dzafic I, Pal BC, 2014,

    Robust Optimization of Storage Investment on Transmission Networks

    , IEEE Transactions on Power Systems, Vol: 30, Pages: 531-539, ISSN: 0885-8950

    This paper discusses the need for the integration of storage systems on transmission networks having renewable sources, and presents a tool for energy storage planning. The tool employs robust optimization to minimize the investment in storage units that guarantee a feasible system operation, without load or renewable power curtailment, for all scenarios in the convex hull of a discrete uncertainty set; it is termed ROSION—Robust Optimization of Storage Investment On Networks. The computational engine in ROSION is a specific tailored implementation of a column-and-constraint generation algorithm for two-stage robust optimization problems, where a lower and an upper bound on the optimal objective function value are successively calculated until convergence. The lower bound is computed using mixed-integer linear programming and the upper bound via linear programming applied to a sequence of similar problems. ROSION is demonstrated for storage planning on the IEEE 14-bus and 118-bus networks, and the robustness of the designs is validated via Monte Carlo simulation.
  • Conference paper
    Nunna K, Toh TT, Mitcheson PD, Astolfi Aet al., 2014,

    Nonlinear observer and controller design for sensorless operation of a continuously rotating energy harvester

    , 19th World Congress of the International-Federation-of-Automatic-Control (IFAC), Publisher: ELSEVIER SCIENCE BV, Pages: 55-60, ISSN: 2405-8963
  • Conference paper
    Arana C, Evangelou SA, Dini D, 2014,

    Car attitude control by series mechatronic suspension

    , 19th World Congress of the International-Federation-of-Automatic-Control (IFAC), Publisher: ELSEVIER SCIENCE BV, Pages: 10688-10693, ISSN: 2405-8963
  • Journal article
    Lawson J, Pinuela M, Yates DC, Lucyszyn S, Mitcheson PDet al., 2014,

    Long range inductive power transfer system

    , Journal of Physics : Conference Series, Vol: 476, Pages: 1-6, ISSN: 1742-6588

    We report upon a recently developed long range inductive power transfer system (IPT) designed to power remote sensors with mW level power consumption at distances up to 7 m. In this paper an inductive link is established between a large planar (1 × 1 m) transmit coil (Tx) and a small planer (170 × 170 mm) receiver coil (Rx), demonstrating the viability of highly asymmetrical coil configurations that real-world applications such as sensor networks impose. High Q factor Tx and Rx coils required for viable power transfer efficiencies over such distances are measured using a resonant method. The applicability of the Class-E amplifier in very low magnetic coupling scenarios and at the high frequencies of operation required for high Q operation is demonstrated by its usage as the Tx coil driver.
  • Conference paper
    Scarciotti G, Astollfi A, 2014,

    Model Reduction by Moment Matching for Linear Time-Delay Systems

    , 19th World Congress of the International-Federation-of-Automatic-Control (IFAC), Publisher: ELSEVIER SCIENCE BV, Pages: 9462-9467, ISSN: 2405-8963
  • Conference paper
    Teng F, Pudjianto D, Strbac G, Ferretti F, Bove Ret al., 2014,

    Assessment of the value of plant flexibility in low carbon energy system

    This paper examines the value of flexibility from thermal power plant in the future low carbon energy system. Stochastic scheduling model with rolling planning is performed to calculate the operation cost saving due to improved flexibility. The model optimally schedule energy and ancillary services by explicitly modelling of uncertainties associated with renewable production and generation outage. Various flexibility features are defined and analysed across two representative systems showing that the value of plant flexibility is system specific. Sensitivity studies are carried out to understand the impact of different scheduling methods and carbon taxes on the value of flexibility. This paper also presents the discussion on market reward for flexibility.
  • Conference paper
    Schiffer J, Ortega R, Astolfi A, Raisch J, Sezi Tet al., 2014,

    Stability of Synchronized Motions of Inverter-Based Microgrids Under Droop Control

    , 19th World Congress of the International-Federation-of-Automatic-Control (IFAC), Publisher: ELSEVIER SCIENCE BV, Pages: 6361-6367, ISSN: 2405-8963
  • Journal article
    Kiziroglou ME, Wright SW, Toh TT, Mitcheson PD, Becker T, Yeatman EMet al., 2014,

    Design and Fabrication of Heat Storage Thermoelectric Harvesting Devices

    , Industrial Electronics, IEEE Transactions on, Vol: 61, Pages: 302-309, ISSN: 0278-0046
  • Journal article
    Plet CA, Green TC, 2014,

    Fault response of inverter interfaced distributed generators in grid-connected applications

    , ELECTRIC POWER SYSTEMS RESEARCH, Vol: 106, Pages: 21-28, ISSN: 0378-7796
  • Journal article
    Longo S, Kerrigan EC, Constantinides GA, 2014,

    Constrained LQR for low-precision data representation

    , Automatica, Vol: 50, Pages: 162-168, ISSN: 1873-2836

    Performing computations with a low-bit number representation results in a faster implementation that uses less silicon, and hence allows an algorithm to be implemented in smaller and cheaper processors without loss of performance. We propose a novel formulation to efficiently exploit the low (or non-standard) precision number representation of some computer architectures when computing the solution to constrained LQR problems, such as those that arise in predictive control. The main idea is to include suitably-defined decision variables in the quadratic program, in addition to the states and the inputs, to allow for smaller roundoff errors in the solver. This enables one to trade off the number of bits used for data representation against speed and/or hardware resources, so that smaller numerical errors can be achieved for the same number of bits (same silicon area). Because of data dependencies, the algorithm complexity, in terms of computation time and hardware resources, does not necessarily increase despite the larger number of decision variables. Examples show that a 10-fold reduction in hardware resources is possible compared to using double precision floating point, without loss of closed-loop performance.
  • Conference paper
    Nunna K, Sassano M, Astolfi A, 2014,

    Dynamic Interconnection and Damping Assignment

    , 53rd IEEE Annual Conference on Decision and Control (CDC), Publisher: IEEE, Pages: 1563-1568, ISSN: 0743-1546
  • Conference paper
    Yan S, Tan S-C, Lee C-K, Hui SYRet al., 2014,

    Reducing Three-Phase Power Imbalance with Electric Springs

    , IEEE 5th International Symposium on Power Electronics for Distributed Generation Systems (PEDG), Publisher: IEEE, ISSN: 2329-5759
  • Conference paper
    Pin G, Karimi-Ghartemani M, Chen B, Parisini Tet al., 2014,

    Sinusoidal Signal Estimation from a Noisy-Biased Measurement by an Enhanced PLL with Generalized Error Filtering

    , 53rd IEEE Annual Conference on Decision and Control (CDC), Publisher: IEEE, Pages: 4071-4076, ISSN: 0743-1546
  • Conference paper
    Chen B, Pin G, Parisini T, 2014,

    Robust Parametric Estimation of Biased Sinusoidal Signals: a Parallel Pre-filtering Approach

    , 53rd IEEE Annual Conference on Decision and Control (CDC), Publisher: IEEE, Pages: 1804-1809, ISSN: 0743-1546
  • Conference paper
    Keliris C, Polycarpou MM, Parisini T, 2014,

    A Distributed Fault Diagnosis Approach Utilizing Adaptive Approximation for a Class of Interconnected Continuous-Time Nonlinear Systems

    , 53rd IEEE Annual Conference on Decision and Control (CDC), Publisher: IEEE, Pages: 6536-6541, ISSN: 0743-1546
  • Conference paper
    Astolfi A, Boncagni L, Carnevale D, Galeani S, Ganci M, Mazzitelli G, Sassano Met al., 2014,

    Adaptive Hybrid Observer of the Plasma Horizontal Position at FTU

    , 22nd Mediterranean Conference on Control and Automation (MED), Publisher: IEEE, Pages: 1088-1093, ISSN: 2325-369X
  • Conference paper
    Moreno FJ, Merlin MMC, Trainer DR, Dyke KJ, Green TCet al., 2014,

    Control of an alternate arm converter connected to a star transformer

    , Pages: 1-10
  • Conference paper
    Clemow P, Judge P, Chaffey G, Merlin M, Luth T, Green TCet al., 2014,

    Lab-scale experimental multilevel modular HVDC converter with temperature controlled cells

    , Pages: 1-10
  • Conference paper
    Luth T, Merlin MMC, Green TC, 2014,

    Modular multilevel DC/DC converter architectures for HVDC taps

    , Pages: 1-10
  • Conference paper
    Junyent-Ferre A, Clemow P, Merlin M, Green TCet al., 2014,

    Operation of HVDC Modular Multilevel Converters under DC pole imbalances

    , Pages: 1-10
  • Conference paper
    Merlin MMC, Green TC, Mitcheson PD, Moreno FJ, Dyke KJ, Trainer DRet al., 2014,

    Cell capacitor sizing in modular multilevel converters and hybrid topologies

    , Pages: 1-10
  • Conference paper
    Jiang H, Kiziroglou ME, Yates DC, Yeatman EMet al., 2014,

    A Piezoelectric Pulse Generator and FM Transmission Circuit for Self-Powered BSN Nodes

    , Wearable and Implantable Body Sensor Networks (BSN), 2014 11th International Conference on, Publisher: IEEE, Pages: 1-5
  • Conference paper
    Spallarossa CE, Green TC, Lin C, Wu Xet al., 2014,

    A DC Voltage Control Strategy for MMC MTDC Grids incorporating Multiple Master Stations

    , IEEE PES T and D Conference and Exposition, Publisher: IEEE

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