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  • Conference paper
    Pipelzadeh Y, Chaudhuri B, Green TC, 2010,

    Decentralised Control for Damping Multi-Modal Oscillations through CSC/VSC Based HVDC Transmission Technologies

    , The 9th international conference on AC and DC power transmission (ACDC 2010)
  • Conference paper
    Pipelzadeh Y, Chaudhuri B, Green TC, 2010,

    Stability Improvement through HVDC Upgrade in the Australian Equivalent System

    , UPEC 2010
  • Conference paper
    Bottrell N, Prodanović M, Green TC, 2010,

    Analysed small signal state-space model of an active rectifier

    This paper presents a small signal state-space model of an active rectifier. The model considers the reference frame, the variation of frequency and control dynamics. It is suitable for analysing small signal stability of active rectifier loads in networks where a small load perturbation may cause a frequency disturbance. The model is formed by separating the active rectifier into sub sections. Each subsection is modelled independently before being consolidated into a single small signal state-space equation. A sensitivity analysis of the active rectifier is also presented which identifies the states most associated with each mode. This indicates possible feedback signals for the design of controllers to improve the system stability. The model is tested using rapid prototyping power converters configured as the active rectifier itself and the system load. The laboratory arrangement allows the active rectifier to be connected to either the public network via isolation transformers or a private network where the voltage and frequency are fully controllable. During the experimentation the active rectifier is shown to have negative impedance characteristics which are known to cause destabilising effects in networks.
  • Conference paper
    Clemow P, Green TC, 2010,

    Wind farm output smoothing through coordinated control

    This paper presents a new method of using coordinated control and short term wind speed prediction to smooth the output of an array of wind turbines. The proposed controller uses knowledge of the kinetic energy storage potential in the rotor disc to allow production of pre-determined power profiles for periods of around 60s from variable wind inputs. Previous studies have shown that there are large peaks in wind power variability in the minutes timescale which is within the ability of a control system to reduce. This variation will cause issues with balancing systems within the local grid, as such it is beneficial to remove it. Results of tests to the system are presented which show a significant reduction in wind farm output power variability without a significant drop in output power. Comparisons with the natural smoothing effect are also presented and show that despite the significant smoothing found in large and distributed wind farms, there is still a possibility to improve the output.
  • Conference paper
    Toh TT, Mitcheson PD, Yeatman EM, 2010,

    Control models of Switch Mode Maximum Power Point Tracking Interfaces for Energy Harvesting Devices

    , PowerMEMS 2010, Pages: 155-158
  • Conference paper
    Pinuela M, Mitcheson PD, Lucyszyn S, 2010,

    Analysis of Scalable Rectenna Configurations for Harvesting High Frequency Ambient Radiation

    , PowerMEMS 2010, Pages: 41-44
  • Conference paper
    Hey J, Howey DA, Martinez-Botas R, Lamperth Met al., 2010,

    Transient Thermal Modeling of an Axial Flux Permanent Magnet (AFPM) Machine Using a Hybrid Thermal Model

    , International Conference on Thermal and Fluids Engineering, Publisher: World Academy of Science, Engineering and Technology (WASET)

    This paper presents the development of a hybrid thermal model for the EVO Electric AFM 140 Axial Flux Permanent Magnet (AFPM) machine as used in hybrid and electric vehicles. The adopted approach is based on a hybrid lumped parameter and finite difference method. The proposed method divides each motor component into regular elements which are connected together in a thermal resistance network representing all the physical connections in all three dimensions. The element shape and size are chosen according to the component geometry to ensure consistency. The fluid domain is lumped into one region with averaged heat transfer parameters connecting it to the solid domain. Some model parameters are obtained from Computation Fluid Dynamic (CFD) simulation and empirical data. The hybrid thermal model is described by a set of coupled linear first order differential equations which is discretised and solved iteratively to obtain the temperature profile. The computation involved is low and thus the model is suitable for transient temperature predictions. The maximum error in temperature prediction is 3.4% and the mean error is consistently lower than the mean error due to uncertainty in measurements. The details of the model development, temperature predictions and suggestions for design improvements are presented in this paper.
  • Journal article
    Chen W, Hui SYR, 2010,

    A dimmable Light-emitting diode (LED) driver with cascaded mag-amp postregulators for multistring applications

    , IECON Proceedings (Industrial Electronics Conference), Pages: 2523-2528

    A dimmable LED driver with cascaded magnetic amplifiers is proposed for multistring applications. A master power converter is used to provide the major part of the voltage for a plurality of slave converter modules with magnetic amplifier control. The magnetic amplifiers are used to regulate only the varying part of the LED string voltage and therefore greatly reduce the power losses in parallel converter modules. Good current balance among the parallel LED strings and a high energy efficiency in the range of 86-88% has been achieved for a 21W practical prototype formed with 3 parallel strings. © 2010 IEEE.
  • Journal article
    Couchman IJ, Kerrigan EC, 2010,

    Control of mixing in a Stokes' fluid flow

    , JOURNAL OF PROCESS CONTROL, Vol: 20, Pages: 1103-1115, ISSN: 0959-1524
  • Conference paper
    Holmes AS, Howey DA, Bansal A, Yates DCet al., 2010,

    Self-powered wireless sensor for duct monitoring

    , PowerMEMS 2010, the 10th International Workshop on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, Pages: 115-118
  • Patent
    Green TC, Merlin MMC, Okaeme N, Trainer DRet al., 2010,

    Modular Multilevel Converter
  • Conference paper
    Merlin MMC, Green TC, Mitcheson PD, Trainer D, Critchley R, Crookes RWet al., 2010,

    A New Hybrid Multi-Level Voltage-Sourced Converter with DC Fault Blocking Capability

    , IET Conference on AC/DC Transmission
  • Journal article
    Gomis-Bellmunt O, Junyent-Ferre A, Sumper A, Galceran-Arellano Set al., 2010,

    Maximum generation power evaluation of variable frequency offshore wind farms when connected to a single power converter

    , APPLIED ENERGY, Vol: 87, Pages: 3103-3109, ISSN: 0306-2619
  • Journal article
    Junyent-Ferre A, Gomis-Bellmunt O, Sumper A, Sala M, Mata Met al., 2010,

    Modeling and control of the doubly fed induction generator wind turbine

    , SIMULATION MODELLING PRACTICE AND THEORY, Vol: 18, Pages: 1365-1381, ISSN: 1569-190X
  • Journal article
    Angeli D, De Leenheer P, Sontag E, 2010,

    Graph-theoretic characterizations of monotonicity of chemical networks in reaction coordinates

    , JOURNAL OF MATHEMATICAL BIOLOGY, Vol: 61, Pages: 581-616, ISSN: 0303-6812
  • Journal article
    Chaudhuri NR, Domahidi A, Majumder R, Chaudhuri B, Korba P, Ray S, Uhlen Ket al., 2010,

    Wide-area power oscillation damping control in Nordic equivalent system

    , IET GENERATION TRANSMISSION & DISTRIBUTION, Vol: 4, Pages: 1139-1150, ISSN: 1751-8687
  • Journal article
    Astolfi A, 2010,

    Model Reduction by Moment Matching for Linear and Nonlinear Systems

    , IEEE TRANSACTIONS ON AUTOMATIC CONTROL, Vol: 55, Pages: 2321-2336, ISSN: 0018-9286

    The model reduction problem for (single-input, single-output) linear and nonlinear systems is addressed using the notion of moment. A re-visitation of the linear theory allows to obtain novel results for linear systems and to develop a nonlinear enhancement of the notion of moment. This, in turn, is used to pose and solve the model reduction problem by moment matching for nonlinear systems, to develop a notion of frequency response for nonlinear systems, and to solve model reduction problems in the presence of constraints on the reduced model. Connections between the proposed results, projection methods, the covariance extension problem and interpolation theory are presented. Finally, the theory is illustrated by means of simple worked out examples and case studies.
  • Conference paper
    Araneda JC, Mocarquer S, Moreno R, Rudnick Het al., 2010,

    Challenges on Integrating Renewables into the Chilean Grid

    , International Conference on Power System Technology (POWERCON), 2010
  • Journal article
    Moreno R, Barroso L, Rudnick H, Mocarquer S, Bezerra Bet al., 2010,

    Auction Approaches of Long-Term Contracts to Ensure Generation Investment in Electricity Markets: Lessons from the Brazilian and Chilean Experiences

    , Energy Policy, Vol: 38, Pages: 5758-5769
  • Journal article
    Zhong WX, Ho WC, Hui SYR, 2010,

    Generalized self-driven AC-DC synchronous rectification techniques for single- & multiphase systems

    , 2010 International Power Electronics Conference - ECCE Asia -, IPEC 2010, Pages: 2098-2105

    This paper extends the single-phase self-driven synchronous rectification (SDSR) technique to multiphase and multi-level AC-DC systems. Power MOSFETs with either voltage or current self-sensing and self-driven gate drives are used to replace diodes in the rectifier circuits. The generalized methodology allows multiphase SDSRs to be designed to replace multiphase diode rectifiers. Unlike traditional SR designed for high-frequency power converters, the SDSR proposed here can be direct replacement of power diode bridges for both low and high frequency operations. The SDSR utilizes its output dc voltage to power its control circuit. No start-up control is needed because the body diodes of the power MOSFETs provide the diode rectifier for initial start-up stage. The generalized method is demonstrated in 2kW 1-phase and 3-phase SDSRs. Power loss reduction in the range of 50% to 69% has been achieved for inductive, capacitive and resistive loads. © 2010 IEEE.
  • Patent
    Rogers DJ, Green TC, 2010,

    Method And Apparatus For Performing On-Load Mechanical Switching Operations

    An electrical device comprising: a first current path having a primary switch therein, and means for coupling to an electrical supply; and a diversionary current path having semiconductor switching means therein, the semiconductor switching means being operable to bypass the primary switch; the device being arranged such that, in use, a first current flowing from the supply along the first current path can be diverted, on the operation of the semiconductor switching means, along the diversionary current path, bypassing the primary switch; wherein the diversionary current path comprises a controllable electrical supply operable to supply a second current whilst the semiconductor switching means are in a state of conduction, the second current being such as to cause substantially zero current to flow through the primary switch, such that the primary switch can then be opened under a condition of substantially zero load current. A corresponding method of operating a mechanical switch in such a device is also provided.The disclosure further provides a controllable electrical supply comprising: an electrical source; an amplifier having two output terminals and comprising a plurality of semiconductor devices; and control logic arranged to operate the amplifier such that it can selectively present both current and voltage source behaviour at the terminals.
  • Conference paper
    Rogers DJ, Green TC, 2010,

    Zero-current zero-voltage switching for on-load tap changers

    We present a new on-load tap changer (OLTC) design that provides the traditional advantages of the semiconductor-assisted OLTC over the classic, mechanical OLTC. The design provides zero-current, zero-voltage operation of both diverter switches at all times, eliminating contact wear due to arcing. The design of the diverter sub-circuit is discussed, including the introduction of a voltage source and corresponding control loop that provides the necessary shunt current or voltage to create the desired zero conditions in the diverter switches. The design differs from existing semiconductor-assisted OLTC systems by the fact that the semiconductor portion of the system is connected in a purely shunt configuration to the main current path. Under normal conditions the load current flows only in the selector and diverter switches making the system very low loss.
  • Conference paper
    Ahmadi AR, Green TC, 2010,

    Voltage versus Power Factor Regulation for enhancement of renewable generation capacity

    The connection of Distributed Generators (DGs) to distribution network creates technical concerns for Distribution Network Operators (DNOs) which primarily include power flow management, loss increase and voltage management problems. Active Network Management (ANM) system provides monitoring and control of the distribution network as well as providing the infrastructure and technology for full integration of DGs to the distribution network. Optimal Power Flow (OPF) is a valuable tool in providing optimal control solutions for active network management system applications. In this paper, Terminal Voltage Regulator Mode (TVRM) and fixed Power Factor Regulation Mode (PFRM) were incorporated in the main optimisation routine to extract the maximum real power output capacity. The main contribution was to test different droop characteristics including one with local voltage regulator dead-bands associated to a particular DG. The DG operation methods of PFRM and TVRM are then compared together. Numerical result obtained from tests on two U.K. representative distribution networks show that TVRM has the potential in offering more capacity exploitation and improving network flexibility for additional DG connection.
  • Journal article
    Pannocchia G, Rawlings JB, Mayne DQ, Marquardt Wet al., 2010,

    On Computing Solutions to the Continuous Time Constrained Linear Quadratic Regulator

    , IEEE TRANSACTIONS ON AUTOMATIC CONTROL, Vol: 55, Pages: 2192-2198, ISSN: 0018-9286
  • Journal article
    Moreno R, Strbac G, Porrua F, Mocarquer S, Bezerra Bet al., 2010,

    Making Room for the Boom

    , IEEE POWER & ENERGY MAGAZINE, Vol: 8, Pages: 36-46, ISSN: 1540-7977
  • Journal article
    Jones BL, Kerrigan EC, 2010,

    When is the discretization of a spatially distributed system good enough for control?

    , AUTOMATICA, Vol: 46, Pages: 1462-1468, ISSN: 0005-1098
  • Journal article
    Moreno R, Strbac G, Porrua F, Mocarquer S, Bezerra Bet al., 2010,

    Making Room for the Boom - New Regulatory Avenues and Network Infrastructure Changes for Accommodating Renewables

    , IEEE Power and Energy Magazine, Vol: 8, Pages: 36-46
  • Journal article
    Sassano M, Carnevale D, Astolfi A, 2010,

    Observer design for range and orientation identification

    , AUTOMATICA, Vol: 46, Pages: 1369-1375, ISSN: 0005-1098
  • Journal article
    Jabr RA, Pal BC, Martins N, JCR Fet al., 2010,

    Robust and coordinated tuning of power system stabiliser gains using sequential linear programming

    , IET Generation, Transmission and Distribution, Vol: 4, Pages: 893-904, ISSN: 1751-8687

    This study presents a linear programming (LP)-based multivariable root locus following technique for coordinating the gain settings of power system stabilisers (PSSs). The stabiliser robustness is accounted for in the design problem by simultaneously considering the state-space representations and multivariable root loci corresponding to different operating scenarios. The proposed technique computes a curve in the PSS gain parameter space such that when the PSS gains move along this curve to their optimal values, the branches of the corresponding multivariable root loci terminate at satisfactory points in the complex plane. The curve in the gain parameter space is computed via a linear program that successively minimises the Euclidean distance between the unsatisfactory and satisfactory eigenvalue locations. The design method is demonstrated on a 39-bus test system with 14 operating scenarios. A comparison is carried out between the coordination results of two PSS structures, one involving two phase-lead blocks and the other comprised of two phase-lead blocks and a phase-lag block.
  • Journal article
    Singh R, Manitsas E, Pal BC, Strbac Get al., 2010,

    A Recursive Bayesian Approach for Identification of Network Configuration Changes in Distribution System State Estimation

    , IEEE Transactions on Power Systems, Vol: 25, Pages: 1329-1336

    This paper deals with the identification of network configuration changes in distribution system state estimation (DSSE). The models of critical network configurations are stored in the form of a model bank. A recursive Bayesian approach which utilizes the output of the state estimation function of each model in the bank is used to identify the correct configuration of the network. The concept is demonstrated on a part of the U.K. Generic Distribution System (UKGDS) model.

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