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  • 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
    Kiskiras J, Jaimoukha IM, Halikias GD, 2013,

    An explicit state-space solution to the one-block super-optimal distance problem

    , Mathematics of Control, Signals and Systems (MCSS), Vol: 25, Pages: 167-196

    An explicit state-space approach is presented for solving the super-optimal Nehari-extension problem. The approach is based on the all-pass dilation technique developed in [JL93] which offers considerable advantages compared to traditional methods relying on a diagonalisation procedure via a Schmidt pair of the Hankel operator associated with the problem. As a result, all derivations presented in this work rely only on simple linear-algebraic arguments. Further, when the simple structure of the one-block problem is taken into account, this approach leads to a detailed and complete state-space analysis which clearly illustrates the structure of the optimal solution and allows for the removal of all technical assumptions (minimality, multiplicity of largest Hankel singular value, positive-definiteness of the solutions of certain Riccati equations) made in previous work [LHG89],[HLG93]. The advantages of the approach are illustrated with a numerical example. Finally, the paper presents a short survey of super-optimization, the various techniques developed for its solution and some of its applications in the area of modern robust control.
  • 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
    • Cite
    • Citations: 138
  • 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
  • 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
  • Patent
    Trainer DR, Crookes W, Green TC, Merlin MMCet al., 2013,

    HVDC Converter Comprising Fullbridge Cells For Handling A DC Side Short Circuit
  • Journal article
    Pinuela M, Yates DC, Lucyszyn S, Mitcheson PDet al., 2013,

    Maximizing DC-to-Load Efficiency for Inductive Power Transfer

    , IEEE Transactions on Power Electronics, Vol: 28, Pages: 2437-2447, ISSN: 0885-8993

    Inductive Power Transfer (IPT) systems for transmitting tens to hundreds of watts have been reported for almost a decade. Most of the work has concentrated on the optimization of the link efficiency and have not taken into account the efficiency of the driver. Class-E amplifiers have been identified as ideal drivers for IPT applications, but their power handling capabilityat tens of MHz has been a crucial limiting factor, since the load and inductor characteristics are set by the requirements of the resonant inductive system. The frequency limitation of the driver restricts the unloaded Q factor of the coils and thus the link efficiency. With a suitable driver, copper coilunloaded Q factors of over 1,000 can be achieved in the low MHz region, enabling a cost-effective high Q coil assembly. The system presented in this paper alleviates the use of heavy andexpensive field-shaping techniques by presenting an efficient IPT system capable of transmitting energy with a dc-to-load efficiency above 77% at 6 MHz across a distance of 30 cm. To the authorsknowledge this is the highest dc-to-load efficiency achieved for an IPT system without introducing restrictive coupling factor enhancement techniques.
  • Journal article
    Dzafic I, Gilles M, Jabr RA, Pal BC, Henselmeyer Set al., 2013,

    Real Time Estimation of Loads in Radial and Unsymmetrical Three-Phase Distribution Networks

    , IEEE Transactions on Power Systems, Vol: 28, Pages: 4839-4848, ISSN: 0885-8950

    This paper presents a load estimator for large scale asymmetric distribution networks. It is based on iterating between 1) a weighted least squares (WLS) estimator that attempts to adjust the forecasted load group values to the telemetered measurements and 2) a three-phase load flow employing the Fortescue transformation. The WLS estimation phase explicitly handles Y- and $Delta$-connected unbalanced loads and area losses; it can also identify bad measurements based on the estimated load scaling factors. Numerical results show that the proposed load estimator is superior to conventional load allocation based on current balancing, and that its performance is commensurate with the requirements of real-time applications on unsymmetrical radial distribution networks having up to one million nodes.
  • Journal article
    Pin G, Filippo M, Pellegrino FA, Fenu G, Parisini Tet al., 2013,

    Approximate model predictive control laws for constrained nonlinear discrete-time systems: analysis and offline design

    , INTERNATIONAL JOURNAL OF CONTROL, Vol: 86, Pages: 804-820, ISSN: 0020-7179
  • Journal article
    Ariff MAM, Pal BC, 2013,

    Coherency Identification in Interconnected Power Systems - An Independent Component Analysis Approach

    , IEEE Transactions on Power Systems, Vol: 28, Pages: 1747-1756, ISSN: 0885-8950

    This paper presents a novel approach to the coherency identification technique in interconnected power system using independent component analysis (ICA). The ICA is applied to the generator speed and bus angle data to identify the coherent areas of the system. The results of the application of ICA using simulated data from 16-machine 68-bus system model and on data gathered through U.K. University-based Wide-Area Measurement System are presented. The approach is able to identify the cluster of generators and buses following a disturbance in the system. It is also demonstrated that the approach is robust in the presence of noise in measured signal, which is an important factor to be considered for assessing the effectiveness of any measurement-based technique.
  • Journal article
    Simfukwe D, Pal BC, 2013,

    Robust and Low Order Power Oscillations Damper Design Through Polynomial Control

    , IEEE Transactions on Power Systems, Vol: 28, Pages: 1599-1609, ISSN: 0885-8950

    The paper presents a method for designing low order robust controllers for stabilizing power system oscillations. The method uses polynomial control techniques. For single-input/single-output systems (SISO), the variability in operating conditions is captured using an interval polynomial. Kharitonov's theorem is then used to characterize a fixed order robust controller guaranteeing specified damping. This gives bi-linear matrix inequality (BMI) stability conditions which are solved using the BMI solver PENBMI. The effectiveness of the method is demonstrated by designing power oscillation damping (POD) controllers for single-, four-, and 16-machine power system models.
  • Conference paper
    Pinuela M, Yates DC, Mitcheson PD, Lucyszyn Set al., 2013,

    London RF Survey for Radiative Ambient RF Energy Harvesters and Efficient DC-load Inductive Power Transfer

    , 7th EurAAP European Conference on Antennas and Propagation (EUCAP 2013), Pages: 2839-2843
  • Journal article
    Moreno R, Pudjianto D, Strbac G, 2013,

    Transmission Network Investment with Probabilistic Security and Corrective Control

    , IEEE Transactions on Power Systems
  • Journal article
    Ortega R, Espinosa-Perez G, Astolfi A, 2013,

    Passivity-based control of AC drives: theory for the user and application examples

    , INTERNATIONAL JOURNAL OF CONTROL, Vol: 86, Pages: 625-635, ISSN: 0020-7179
  • Journal article
    Boem F, Ferrari RMG, Parisini T, Polycarpou MMet al., 2013,

    Distributed fault diagnosis for continuous-time nonlinear systems: The input-output case

    , ANNUAL REVIEWS IN CONTROL, Vol: 37, Pages: 163-169, ISSN: 1367-5788
  • Journal article
    Rogers DJ, Green TC, 2013,

    An Active-Shunt Diverter for On-load Tap Changers

    , IEEE TRANSACTIONS ON POWER DELIVERY, Vol: 28, Pages: 649-657, ISSN: 0885-8977
  • Journal article
    Bloemink JM, Green TC, 2013,

    Benefits of Distribution-Level Power Electronics for Supporting Distributed Generation Growth

    , IEEE TRANSACTIONS ON POWER DELIVERY, Vol: 28, Pages: 911-919, ISSN: 0885-8977
    • Cite
    • Citations: 184
  • Journal article
    Sassano M, Astolfi A, 2013,

    Dynamic Lyapunov functions

    , AUTOMATICA, Vol: 49, Pages: 1058-1067, ISSN: 0005-1098
  • Journal article
    Welsch M, Bazilian M, Howells M, Divan D, Elzinga D, Strbac G, Jones L, Keane A, Gielen D, Balijepalli VSKM, Brew-Hammond A, Yumkella Ket al., 2013,

    Smart and Just Grids for sub-Saharan Africa: Exploring options

    , RENEWABLE & SUSTAINABLE ENERGY REVIEWS, Vol: 20, Pages: 336-352, ISSN: 1364-0321
    • Cite
    • Citations: 58
  • Patent
    Fabozzi D, Thornhill N, Pal BC, 2013,

    Power System Control

    Summary of InventionIn accordance with an aspect of the invention there is provided a method for allocating a plurality of power reserves to deliver power to a power network to meet a power reserve requirement for balancing a frequency of the power network. The method comprises obtaining, for a plurality of power reserves of a power network, power reserve flexibility characteristics associated with each power reserve. The method further comprises obtaining, for the plurality of power reserves, an indexing value associated with the delivery of power by each of the power reserves. The method further comprises determining a power reserve requirement associated with the power network. The method further comprises assigning one or more of the plurality of power reserves to deliver power to the power network, the plurality of power reserves assigned in accordance with the power reserve flexibility characteristics associated with each of the power reserves, the indexing value associated with each of the power reserves, and the power reserve requirement associated with the power network. The power reserve flexibility characteristics may be indicative of power deliverable to the power network by the respective power reserve with respect to time. The power reserve flexibility characteristics may include characteristics of positive and/or negative power reserve flexibility.The power reserve flexibility characteristics may include one or more of a maximum deliverable power, a period of time to provide the maximum deliverable power from receipt of an instruction for power delivery, a minimum duration for sustaining the maximum deliverable power and a period of time to reduce power delivery from the maximum deliverable power to a minimum deliverable power.The assigning of one or more of the plurality of power reserves may further comprise selecting one or more of the plurality power reserves to provide the power reserve requirement in order of the indexing value associated with t
  • Journal article
    Parisini T, 2013,

    Untitled

    , IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY, Vol: 21, Pages: 281-282, ISSN: 1063-6536
  • Journal article
    Lee CK, Chaudhuri B, Hui SY, 2013,

    Hardware and Control Implementation of Electric Springs for Stabilizing Future Smart Grid With Intermittent Renewable Energy Sources

    , IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS, Vol: 1, Pages: 18-27, ISSN: 2168-6777
  • Journal article
    Pin G, Francesconi V, Cuzzola FA, Parisini Tet al., 2013,

    Adaptive task-space metal strip-flatness control in cold multi-roll mill stands

    , JOURNAL OF PROCESS CONTROL, Vol: 23, Pages: 108-119, ISSN: 0959-1524
  • Journal article
    Chaudhuri NR, Majumder R, Chaudhuri B, 2013,

    System Frequency Support Through Multi-Terminal DC (MTDC) Grids

    , IEEE TRANSACTIONS ON POWER SYSTEMS, Vol: 28, Pages: 347-356, ISSN: 0885-8950
  • Journal article
    Sassano M, Astolfi A, 2013,

    Approximate finite-horizon optimal control without PDEs

    , SYSTEMS & CONTROL LETTERS, Vol: 62, Pages: 97-103, ISSN: 0167-6911
  • Journal article
    Arif J, Ray S, Chaudhuri B, 2013,

    MIMO feedback linearization control for power systems

    , INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS, Vol: 45, Pages: 87-97, ISSN: 0142-0615

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