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  • Report
    Cain MG, Mitcheson PD, 2012,

    Rectification of harvested energy in vibrational energy harvesting materials technologies: Materials, power systems design and electronic engineering issues
  • Conference paper
    Mylvaganam T, Astolfi A, 2012,

    Approximate Optimal Monitoring: Preliminary Results

    , American Control Conference (ACC), Publisher: IEEE COMPUTER SOC, Pages: 4745-4750, ISSN: 0743-1619
  • Conference paper
    Sassano M, Passenbrunner TE, Hirsch M, del Re L, Astolfi Aet al., 2012,

    Approximate Optimal Control of the Air Path of a Diesel Engine

    , American Control Conference (ACC), Publisher: IEEE COMPUTER SOC, Pages: 4204-4209, ISSN: 0743-1619
  • Conference paper
    Longo S, Kerrigan EC, Ling KV, Constantinides GAet al., 2011,

    Parallel Move Blocking Model Predictive Control

    , 50th IEEE Conference on Decision and Control and European Control Conference, Publisher: IEEE

    This paper investigates the use of parallel computing architectures (multi-core, FPGA, GPU) to implement a parallel move-blocking Model Predictive Control (MPC) algorithm where multiple optimization problems are solved simultaneously. Since smaller problems are solved, and these are solved in parallel, the computational delay is reduced when compared to standard MPC. This allows for faster sampling which can outperform, in terms of closed-loop cost, a standard MPC formulation. Feasibility and stability can be guaranteed by an appropriate selection of the so-called blocking matrices.
  • Conference paper
    Pipelzadeh Y, Chaudhuri B, Green TC, 2011,

    Coordinated Damping Control Through MultipleHVDC Systems: A Decentralized Approach

    , IEEE Power and Energy Society General Meeting 2011

    The role of multiple HVDC links - both CSC and VSC - in improving the AC system dynamic performance is presented here. An Australian equivalent system with three critical interareamodes is considered to illustrate the case study on DIgSILENT PowerFactory. Subspace-based multi-input-multi-output(MIMO) system identification is used to estimate and validatelinearized state-space models through pseudo random binary sequence (PRBS) probing in DIgSILENT PowerFactory. Choice of appropriate input-output combinations is done through modalresidue analysis taking note of not only the magnitudes but also the phase angles. The decentralized control design is posed as an optimization problem and solved using an evolutionary technique. The results are validated through linear analysis andnon linear simulation in DIgSILENT for two extreme (light and heavy loading) operating conditions.
  • Conference paper
    Boem F, Pellegrino FA, Fenu G, Parisini Tet al., 2011,

    Multi-feature trajectory clustering using Earth mover's distance

    , Pages: 310-315, ISSN: 2161-8070

    We present new results in trajectory clustering, obtained by extending a recent methodology based on Earth Mover's Distance (EMD). The EMD can be adapted as a tool for trajectory clustering, taking advantage of an effective method for identifying the clusters' representatives by means of the p-median location problem. This methodology can be used either in an unsupervised fashion, or on-line, classifying new trajectories or part of them; it is able to manage different length and noisy trajectories, occlusions and takes velocity profiles and stops into account. We extend our previous work by taking into account other features besides the spatial locations, in particular we consider the direction of movement in correspondence of each trajectory point. We discuss the simulation results and we compare our approach with another trajectory clustering method. © 2011 IEEE.
  • Conference paper
    Pipelzadeh Y, Chaudhuri B, Green TC, 2011,

    The Impact of Significant Wind Penetration and HVDC Upgrades on the Stability of Future Grids: A Case Study on the Australian Power System

    , CIGRE International Symposium 2011

    Wind power has been the fastest growing energy generation sector worldwide in recent years. Large on- and off-shore wind farms have a considerable impact on system security and stable system operation. Therefore its influence on the dynamic stability of the system must be addressed. For turbines above 1MW, doubly-fed induction generators (DFIG) are the most widely used concept. However in many countries such as U.K and Germany, full-rated converter (FRC) have also gained vast amount of market penetration.To address this, the paper presents studies performed in DIgSILENT PowerFactory aimed at ascertaining the impact that DFIG and FRC have on the oscillation modes of the power system. The feasibility, advantage and disadvantages of various options are discussed.Wind generators can be connected to existing power transmission networks spanning over long distances and ultimately causing interaction between wind-farms and transmission systems. The benefit of utilising HVDC (classical and/or Voltage- source) within an ac network for transporting large amounts of wind power to remote load locations is studied.Wind farms consist of large number of generators of relatively small size. Both types of variable speed wind generators (DFIG and FRC) have been modelled in detail in PowerFactory DIgSILENT. Model aggregation techniques are applied to reduce computation time. Different control strategies for VSC-HVDC and “classical” Thyristor-based HVDC links are presented and analyzed via network simulation. A case study is presented based on the equivalent SE Australian power system, an IEEE benchmark system for dynamic studies, with appropriate reinforcements introduced to accommodate wind generation and HVDC transmission systems.This paper is focused on the small-signal stability issues and analyses the impact of various aspects like generator technology, hybrid AC/HVDC transmission for getting a thorough understanding about the impact of these on the overall system sta
  • Journal article
    Hui SY, Chung HSH, 2011,

    Resonant and soft-switching converters

    , Pages: 409-453

    This chapter covers the basic technology of resonant and soft-switching converters. Prior to the availability of fully controllable power switches, thyristors were the major power devices used in power electronic circuits. The resonant switch is said to operate in half-wave mode. If a diode is connected in anti-parallel with the unidirectional switch, the switch current can flow in both directions. Quasi-resonant converters (QRCs) can be considered as a hybrid of resonant and PWM converters. The underlying principle is to replace the power switch in PWM converters with the resonant switch. Zero-current switching (ZCS) can eliminate the switching losses at turn offand reduce the switching losses at turn on. As a relatively large capacitor is connected across the output diode during resonance, the converter operation becomes insensitive to the diode's junction capacitance. Resonant dc link inverter with low voltage stress consists of a front-end resonant converter that can pull the dc link voltage down just before any inverter switching. This resonant dc circuit serves as an interface between the dc power supply and the inverter. © 2011 Elsevier Inc. All rights reserved.
  • Journal article
    Talj R, Ortega R, Astolfi A, 2011,

    Passivity and robust PI control of the air supply system of a PEM fuel cell model

    , AUTOMATICA, Vol: 47, Pages: 2554-2561, ISSN: 0005-1098
  • Journal article
    Amrit R, Rawlings JB, Angeli D, 2011,

    Economic optimization using model predictive control with a terminal cost

    , ANNUAL REVIEWS IN CONTROL, Vol: 35, Pages: 178-186, ISSN: 1367-5788
  • Journal article
    Kokotovic PV, Astolfi A, 2011,

    David Mayne: Half a century of creativity

    , ANNUAL REVIEWS IN CONTROL, Vol: 35, Pages: 149-152, ISSN: 1367-5788
  • Journal article
    Junyent-Ferre A, Gomis-Bellmunt O, Green TC, Soto-Sanchez DEet al., 2011,

    Current Control Reference Calculation Issues for the Operation of Renewable Source Grid Interface VSCs Under Unbalanced Voltage Sags

    , IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 26, Pages: 3744-3753, ISSN: 0885-8993
  • Journal article
    He C, Kiziroglou ME, Yates DC, 2011,

    A MEMS Self-Powered Sensor and RF Transmission Platform for WSN Nodes

    , IEEE Sensors Journal, Vol: 11, Pages: 3437-3445
  • Journal article
    Mitcheson PD, Toh TT, Wong KH, Burrow SG, Holmes ASet al., 2011,

    Tuning the Resonant Frequency and Damping of an Electromagnetic Energy Harvester Using Power Electronics

    , IEEE Transactions on Circuits and Systems. Part 2: Express Briefs, Vol: 58, Pages: 792-796
  • Journal article
    Longo S, Kerrigan EC, Ling KV, Constantinides GAet al., 2011,

    A parallel formulation for predictive control with nonuniform hold constraints

    , Annual Reviews in Control, Vol: 35, Pages: 207-214, ISSN: 1872-9088

    This paper investigates the use of parallel computing architectures (multi-core, FPGA, GPU) to solve, at each sampling instant, a constrained optimal control problem. A set of approximated (hence smaller) problems are solved simultaneously and the solution of the one with lower open-loop cost is implemented. The approximation consists of the inclusion of additional hold constraints, which effectively reduce the number of steps in the prediction. Since smaller problems are solved, and these are solved in parallel, the computational delay is reduced and faster sampling becomes an option. The proposed method can outperform, in terms of closed-loop cost, a standard receding horizon control formulation because higher sampling rates can improve performance, even if suboptimal solutions are considered. Feasibility and stability can be guaranteed by an appropriate selection of the hold constraints.
  • Conference paper
    Jerez JL, Kerrigan EC, Constantinides GA, 2011,

    A Condensed and Sparse QP Formulation for Predictive Control

    , IEEE Control and Decision Conference
  • Conference paper
    Dicken J, Mitcheson PD, Elliott A, Yeatman EMet al., 2011,

    Single-Supply Pre-Biasing Circuit for Low-Amplitude Energy Harvesting Applications

    , PowerMEMS 2011, Pages: 46-49
  • Conference paper
    Toh TT, Mitcheson PD, Dussud L, Wright SW, Holmes ASet al., 2011,

    Electronic Resonant Frequency Tuning of a Marine Energy Harvester

    , PowerMEMS 2011, Pages: 383-386
  • Conference paper
    Dicken J, Mitcheson PD, Elliott A, Yeatman EMet al., 2011,

    Single-Supply Pre-Biasing Circuit for Low-Amplitude Energy Harvesting Applications

    , PowerMEMS 2011, Pages: 46-49
  • Conference paper
    Mukherjee AG, Mitcheson PD, Wright SW, Yeatman EMet al., 2011,

    Tuning Resonant Energy Harvesters Using a Variable Reluctance Link

    , PowerMEMS 2011, Pages: 11-14
  • Journal article
    Sturt A, Strbac G, 2011,

    Time series modelling of power output for large-scale wind fleets

    , WIND ENERGY, Vol: 14, Pages: 953-966, ISSN: 1095-4244
  • Journal article
    Terzija V, Cai D, Stanojevic V, Strbac Get al., 2011,

    Frequency and Power Components Estimation from Instantaneous Power Signal

    , IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, Vol: 60, Pages: 3640-3649, ISSN: 0018-9456
  • Journal article
    Lin D, Yan W, Hui SYR, 2011,

    Modelling the warm-up phase of the starting processes of high-intensity discharge lamps

    , IET SCIENCE MEASUREMENT & TECHNOLOGY, Vol: 5, Pages: 199-205, ISSN: 1751-8822
  • Patent
    Berggren B, Majumder R, Ray S, Chaudhuri B, Chaudhuri NRet al., 2011,

    Power or Voltage Oscillation Damping in Power Systems

    The invention provides a method, device and computer program product for providing improved control of power or voltage oscillation damping in a power transmission system. The device comprises a magnitude obtaining element (30) configured to obtain an instantaneous magnitude of a signal ( I ΔP I ) representing a deviating oscillation in at least one element (12) of the power transmission system, a slope investigating element (58) configured to determine the rate of change of the signal, and a first processing block (34) comprising an integrating element (38) configured to integrate the instantaneous magnitudes with an integrating factor (Ki) that is based on the determined rate of change. The first processing block is further configured to form a phase compensation angle (ϕc) based on the integrated instantaneous magnitude for use in a damping control signal generating unit in order to provide power or voltage oscillation damping of the system.
  • Journal article
    Lee CK, Su YP, Hui SYR, 2011,

    Printed Spiral Winding Inductor With Wide Frequency Bandwidth

    , IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 26, Pages: 2936-2945, ISSN: 0885-8993
  • Journal article
    Chaudhuri NR, Majumder R, Chaudhuri B, Pan Jet al., 2011,

    Stability Analysis of VSC MTDC Grids Connected to Multimachine AC Systems

    , IEEE TRANSACTIONS ON POWER DELIVERY, Vol: 26, Pages: 2774-2784, ISSN: 0885-8977
  • Journal article
    Prieto-Araujo E, Bianchi FD, Junyent-Ferre A, Gomis-Bellmunt Oet al., 2011,

    Methodology for Droop Control Dynamic Analysis of Multiterminal VSC-HVDC Grids for Offshore Wind Farms

    , IEEE TRANSACTIONS ON POWER DELIVERY, Vol: 26, Pages: 2476-2485, ISSN: 0885-8977
    • Cite
    • Citations: 209
  • Journal article
    Trilla L, Gomis-Bellmunt O, Junyent-Ferre A, Mata M, Sanchez Navarro J, Sudria-Andreu Aet al., 2011,

    Modeling and Validation of DFIG 3-MW Wind Turbine Using Field Test Data of Balanced and Unbalanced Voltage Sags

    , IEEE TRANSACTIONS ON SUSTAINABLE ENERGY, Vol: 2, Pages: 509-519, ISSN: 1949-3029
    • Cite
    • Citations: 52
  • Journal article
    Bettiol P, Frankowska H, Vinter RB, 2011,

    L∞ estimates on trajectories confined to a closed subset

    , Journal of Differential Equations, Vol: 252, Pages: 1912-1933, ISSN: 1090-2732

    This paper concerns the validity of estimates on the distance of an arbitrary state trajectory from the set of state trajectories which lie in a given state constraint set. These so called distance estimates have wide-spread application in state constrained optimal control, including justifying the use of the Maximum Principle in normal form and establishing regularity properties of value functions. We focus on linear, L∞ distance estimates which, of all the available estimates have, so far, been the most widely used. Such estimates are known to be valid for general, closed state constraint sets, provided the functions defining the dynamic constraint are Lipschitz continuous, with respect to the time and state variables. We ask whether linear, L∞ distance estimates remain valid when the Lipschitz continuity hypothesis governing t-dependence of the data is relaxed. We show by counter-example that these distance estimates are not valid in general if the hypothesis of Lipschitz continuity is replaced by continuity. We also provide a new hypothesis, ‘absolute continuity from the left’, for the validity of linear, L∞ estimates. The new hypothesis is less restrictive than Lipschitz continuity and even allows discontinuous time dependence in certain cases. It is satisfied, in particular, by differential inclusions exhibiting non-Lipschitz t-dependence at isolated points, governed, for example, by a fractional-power modulus of continuity. The relevance of distance estimates for state constrained differential inclusions permitting fractional-power time dependence is illustrated by an example in engineering design, where we encounter an isolated, square-root type singularity, concerning the t-dependence of the data.
  • Journal article
    Lin D, Yan W, Hui SYR, 2011,

    Modeling of Dimmable Fluorescent Lamp Including the Tube Temperature Effects

    , IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, Vol: 58, Pages: 4145-4152, ISSN: 0278-0046

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