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  • Conference paper
    Chaudhuri NR, Domahidi A, Chaudhuri B, Majumder R, Korba P, Ray S, Uhlen Ket al., 2010,

    Power Oscillation Damping Control Using Wide-Area Signals: A Case Study on Nordic Equivalent System

    , 2010 IEEE PES Transmission and Distribution Conference and Exposition - Smart Solutions for a Changing World, Publisher: IEEE
  • Conference paper
    Zhang Z, Jaimoukha IM, 2010,

    A measurement analysis approach to online fault detection and isolation for linear discrete-time uncertain systems

    , IEEE Conference on Decision and Control, Publisher: IEEE, Pages: 4399-4404, ISSN: 0743-1546

    This work considers a robust fault detection and isolation (FDI) problem for linear discrete-time systems subject to faults, bounded additive disturbances and norm-bounded uncertainties. We propose a receding horizon estimation procedure (which is a dual scheme to Model Predictive Control (MPC)) to solve FDI problems in which the upper and lower bounds on the faults are computed by using a system model, together with input/output measurements over a finite estimation horizon. Then a fault is regarded as detected and isolated if its obtained upper and lower bounds at some sampling instant are both larger than zero or smaller than zero. Linear Matrix Inequality (LMI) optimization techniques are used to obtain the bounds. Moreover, a subsequent-state-estimation technique, together with an estimation horizon update procedure are given to allow the on-line fault detection and isolation process to be operated in an iterative procedure. Finally, the approach is verified using a numerical example.
  • Conference paper
    Chang H, Astolfi A, Shim H, 2010,

    Immunotherapy for HIV and Malaria: A Control Theoretic Approach with State Jumps

    , American Control Conference, Publisher: IEEE, Pages: 474-479, ISSN: 0743-1619
  • Conference paper
    Chan N, Young T, Brindley H, Chaudhuri B, Ekins-Daukes NJet al., 2010,

    VARIATION IN SPECTRAL IRRADIANCE AND THE CONSEQUENCES FOR MULTI-JUNCTION CONCENTRATOR PHOTOVOLTAIC SYSTEMS

    , 35th IEEE Photovoltaic Specialists Conference, Publisher: IEEE, ISSN: 0160-8371
  • Conference paper
    Acha S, Green TC, Shah N, 2010,

    Techno-economical Tradeoffs from Embedded Technologies with Storage Capabilities on Electric and Gas Distribution Networks

    , IEEE-Power-and-Energy-Society General Meeting, Publisher: IEEE, ISSN: 1944-9925
  • Conference paper
    Chaudhuri NR, Ray S, Majumder R, Chaudhuri Bet al., 2010,

    A New Approach to Continuous Latency Compensation With Adaptive Phasor Power Oscillation Damping Controller (POD)

    , IEEE-Power-and-Energy-Society General Meeting, Publisher: IEEE, ISSN: 1944-9925
  • Conference paper
    Bloemink JM, Green TC, 2010,

    Increasing Distributed Generation Penetration using Soft Normally-Open Points

    , IEEE-Power-and-Energy-Society General Meeting, Publisher: IEEE, ISSN: 1944-9925
  • Journal article
    Lee CK, Su YP, Hui SYR, 2009,

    Multilayer stacked coreless printed spiral winding inductor with wide frequency bandwidth

    , 2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009, Pages: 1002-1009

    In this paper, three types of winding methods for the multi-layer stacked coreless printed spiral winding inductors are studied and evaluated for megahertz operation. They are traditional winding, alternating winding and partial alternating winding. The winding parasitic capacitances of different windings structures are estimated by distributed capacitance models. The electric field energy distributions in the inductors are derived from the voltage profiles to illustrate the relative magnitudes of winding parasitic capacitances. Calculated results show that partial alternating winding has a wide frequency bandwidth with reduced number of through-hole via. All calculated parameters are confirmed with measurements. The results provide useful information for the optimal design of coreless spiral or core-based planar inductors. © 2009 IEEE.
  • Conference paper
    Lobato E, Olmos L, Gómez T, Cossent R, Andersen FM, Grohnheit PE, Mancarella P, Pudjianto D, Strbac G, Van Der Welle A, Van Oostvoorn Fet al., 2009,

    Barriers in the implementation of response options aimed at mitigating unpredictability and variability of wind energy

    , Pages: 3239-3244

    Impacts of increasing wind penetration in the overall electricity system are mainly due to two characteristics of intermittent generation - variability and unpredictability (or prediction error). Impacts (both positive and negative) due to variability and unpredictability were assessed in relation to generation, demand, transmission and distribution systems and markets & trade. In order to counteract the impacts of intermittency, a number of technical and organizational response options are available to the market participants. Each available option should be assessed including technical, economical and regulatory aspects of each option. However, barriers and failures in market competition and regulation may hinder the response options to be developed and implemented by market participants. This paper researches on the main regulatory issues that prevent a successful increase in the wind energy penetration. For this purpose a detailed questionnaire has been elaborated and filled up with the views and opinions of the main stakeholders coming from 5 representative European countries: Spain, UK, Denmark, Germany, and Netherlands. Results presented in this papers are part of the on-going project RESPOND supported by the European Commission, Directorate-General for Energy and Transport, under the Energy Intelligent Europe (EIE) 2003-2006 Programme.
  • Journal article
    Kondoh J, Shafiu A, Jenkins N, Pudjianto D, Strbac Get al., 2009,

    Investigation of direct load management scheme while considering end users comfort

    , IEEJ Transactions on Power and Energy, Vol: 129, ISSN: 0385-4213

    A direct load management scheme with two-way communication while considering end users comfort is proposed. First, the control algorithm is developed and the data required to be transmitted between system operator and controllable loads is identified. Then, the actions of controllable air conditioners and the power adjustment of dispersed generators to eliminate overloads in a substation transformer are simulated. The results indicate that the proposed load management technique performs effectively to reduce overloads on the transformer while maintaining energy consumption in each loads, and the performance is improved by coordination with the output of dispersed generators. © 2009 The Institute of Electrical Engineers of Japan.
  • Conference paper
    Kondala Rao G, Mitcheson PD, Green TC, 2009,

    Mixed Electromechanical Simulation of Electrostatic Microgenerator Using Custom-Semiconductor Device Models

    , PowerMEMS 2009, Pages: 356-359, ISSN: 2151-3155
  • Conference paper
    Toh TT, Mitcheson PD, Yeatman EM, 2009,

    Wireless Sensor Node Using a Rotational Energy Harvester with Adaptive Power Conversion

    , PowerMEMS 2009, Pages: 273-276, ISSN: 2151-3155
  • Conference paper
    Green T, 2009,

    AuRA-NMS: A substation automation project for a potential smart grid

    The smartGrid concept envisages a much more actively controlled distribution network with high asset utilisation and many active elements such as distributed generation, storage and responsive demand. One way of handling the increased control and communication complexity is to decentralise control and place autonomous controllers in substations that have authority to manage tap-changers and generator constraints so as to increase DG capacity while respecting network limits. Such controllers can also perform feeder-level restoration based on local measurement. Such controllers can be gradually introduced as SmartGrid regions within existing networks. The Aura-NMS project is a collaboration of eight UK universities, two network operators and a manufacturer to develop and test these ideas.
  • Conference paper
    Thorner LDA, Mitcheson PD, Holmes AS, Yeatman EMet al., 2009,

    Scaling Laws for Energy Harvesters in a Marine Environment

    , PowerMEMS 09, Pages: 249-252, ISSN: 2151-3155
  • Journal article
    Lee LM, Hui SY, 2009,

    Automatic lamp detection and operation for warm-start tubular fluorescent lamps

    , IEEE Transactions on Power Electronics, Vol: 24, Pages: 2933-2941, ISSN: 0885-8993

    The availability of T5 high-efficiency (HE) and T5 high-output (HO) fluorescent lamp families not only increases the number of commonly used tubular fluorescent lamps from 9 to 18, but more importantly, increases the chance of ballastlamp mismatch because T5 HO and T5 HE lamps have similar physical outlooks and dimensions but vastly different lamp characteristics. The large number of lamp types increases the number of specific ballast designs and users have the new inconvenience of ensuring the correct matching of the lamps and ballasts. In this paper, a survey and analysis of lamp characteristics of all commonly used T5, T8, and T12 tubular fluorescent lamps is presented. Based on the heated lamp electrodes, lamp voltage, and lamp current, a classification system that maps the lamp characteristics into various groups for automatic lamp detection is proposed. The successful implementation of this method is explained and demonstrated. © 2006 IEEE.
  • Journal article
    Domahidi A, Chaudhuri B, Korba P, Majumder R, Green TCet al., 2009,

    Self-tuning flexible ac transmission system controllers for power oscillation damping: A case study in real time

    , IET Generation, Transmission & Distribution, Vol: 3, Pages: 1079-1089
  • Journal article
    Karagiannis D, Sassano M, Astolfi A, 2009,

    Dynamic scaling and observer design with application to adaptive control

    , AUTOMATICA, Vol: 45, Pages: 2883-2889, ISSN: 0005-1098
  • Journal article
    JMC C, Kountouriotis PA, Vinter RB, 2009,

    A New Gaussian Mixture Algorithm for GMTI Tracking Under a Minimum Detectable Velocity Constraint

    , IEEE T AUTOMAT CONTR, Vol: 54, Pages: 2745-2756, ISSN: 0018-9286

    This paper introduces a new methodology to account for Doppler blind zone constraints, arising, for example, in ground moving target indicator (GMTI) tracking applications. In such problems, target measurements are suppressed when the range rate (Doppler) of the target drops below a specified threshold in magnitude (the minimum detectable velocity). The proposed method, employing Gaussian mixture approximations to the filtering density, differs from earlier Gaussian mixture approaches in the way missed measurements are modelled. The distinctive feature of the algorithm, as compared with other Gaussian mixture filters, is that it is based on an exact calculation of the filtering density when a measurement is not recorded. Algorithms that result from applying this methodology are simple to implement and computationally undemanding. Simulation results indicate a uniform improvement in estimation accuracy over that of earlier proposed analytic techniques, and a tracking performance comparable to that of state-of-the-art particle filters.
  • Journal article
    Thommyppillai M, Evangelou S, Sharp RS, 2009,

    Car driving at the limit by adaptive linear optimal preview control

    , Vehicle System Dynamics, Vol: 47
  • Conference paper
    Gan CK, Silva N, Pudjianto D, Strbac G, Ferris R, Foster I, Aten Met al., 2009,

    Evaluation of alternative distribution network design strategies

    A statistical distribution network design tool has been developed to quantitatively assess the impact of alternative distribution network investment plans in terms of capital costs, losses and reliability. In contrast to idealistic and network specific design approaches, this paper presents a statistical assessment approach in which the optimal network design policies are determined by evaluating the costs and benefits of different designs applied on a number of networks with similar properties such as consumer distributions, types, numbers and load density. Simulations have been carried out on multiple voltage levels (LV, MV and HV).
  • Conference paper
    Aunedi M, Štrbac G, Pudjianto D, 2009,

    Characterisation of portfolios of distributed energy resources under uncertainty

    The paper proposes a model to determine the optimal strategy of offering electricity at the day-ahead market for a portfolio of Distributed Energy Resources. The stochastic nature of the problem is taken into account through uncertainty of generator output and forecasts of day-ahead and imbalance prices. The model attempts to maximise the expected profit of the portfolio when exposed to imbalance prices and output uncertainty. Portfolios analysed included conventional generators, wind generators, or both. The results indicate that the proposed approach is able to adapt the offering strategy to the risk profile in different times of the day. Also, significant synergic effects are demonstrated when wind and conventional generators are aggregated into a single portfolio, due to increased flexibility in internal portfolio balancing.
  • Conference paper
    Cao DM, Pudjianto D, Strbac G, Ferris R, Foster I, Aten Met al., 2009,

    Examination of the impact of possible distribution network design on network losses

    In the present climate where reducing CO2 emissions is of increasing importance, reducing losses is becoming one of the important factors considered in distribution network design and operational strategies. This paper simulates various potential network design scenarios using generic distribution network models and evaluates their impact on network losses.
  • Conference paper
    Xu T, Taylor P, Prodanovic M, Green T, Davidson E, McArthur Set al., 2009,

    Case based reasoning for distributed voltage control

    Distribution networks were not designed with significant levels of Distributed Generation (DG) in mind, therefore the proliferation of DG results in a number of technical challenges. Controlling network voltages, while also providing adequate DG access, represents one of the most important challenges. This paper presents research being carried out, as part of the UK AuRA -NMS research project, to address this challenge through the novel application of novel case based reasoning.
  • Conference paper
    Stanojević V, Silva V, Pudjianto D, Strbac G, Lang P, Macleman Det al., 2009,

    Application of storage and demand side management to optimise existing network capacity

    In response to distribution network operational challenges such as aging network assets, the presence of Distributed Generation and expected load growth, new approaches are need to unlock existing network capacity. This paper presents a new methodology for assessing the potential benefits of using storage and Demand Side Management (DSM) to mitigate network congestion and increase the utilisation of the network assets. The methodology is based on a linear multi-period DC optimal power flow (OPF), where DSM and Storage are modelled as a part of the optimisation constraints. Storage and DSM are used to reduce network congestion and increase intermittent DG integration. The benefits of Storage and DSM are evaluated by comparing scenarios without and with these enabling technologies on an urban distribution network considering historical time series data for demand and wind output. The results obtained illustrate the potential applications of Storage and DSM to increase the network capacity utilisation and to reduce both wind curtailment and congestion costs.
  • Conference paper
    Howey DA, Holmes AS, Pullen KR, 2009,

    Measurement of stator heat transfer in air-cooled axial flux permanent magnet machines

    , 35th Annual Conference of the IEEE-Industrial-Electronics-Society (IECON 2009), Publisher: IEEE, Pages: 1197-1202
  • Journal article
    Howey DA, Pullen KR, Holmes AS, 2009,

    Radially resolved measurement of stator heat transfer in a rotor-stator disc system

    , International Journal of Heat and Mass Transfer, Vol: 53, Pages: 491-501, ISSN: 0017-9310

    This paper describes a new experimental method for measuring stator heat transfer in a rotor–stator disc system using an electrical heater array. The system is partially blocked at the periphery, with radial outflow of rotor-pumped air from an inlet at stator centre. The aim is to improve thermal performance prediction for air-cooled disc type electrical machines. Local Nusselt numbers were measured for 0.6<r/R<1 at three non-dimensional gap ratios G=g/R=(0.0106,0.0212,0.0297) and rotational Reynolds numbers 3.7e4less-than-or-equals, slantReθless-than-or-equals, slant5.6e5. Transition at the stator is observed to occur at Reθ>3e5 for all gap ratios. Increased Nusselt numbers at the periphery are observed for all Reθ and G because of the ingress of ambient air along the stator due to the rotor pumping effect.
  • Journal article
    Carnevale D, Astolfi A, 2009,

    Hybrid Observer for Global Frequency Estimation of Saturated Signals

    , IEEE TRANSACTIONS ON AUTOMATIC CONTROL, Vol: 54, Pages: 2461-2464, ISSN: 0018-9286
  • Journal article
    Thommyppillai M, Evangelou S, Sharp RS, 2009,

    Advances in the development of a virtual car driver

    , MULTIBODY SYSTEM DYNAMICS, Vol: 22, Pages: 245-267, ISSN: 1384-5640
  • Conference paper
    Acha S, Green TC, Shah N, 2009,

    Impacts of plug-in hybrid vehicles and combined heat and power technologies on electric and gas distribution network losses

    , 2009 IEEE PES/IAS Conference on Sustainable Alternative Energy (SAE), Publisher: IEEE, Pages: 1-7

    Distribution network operators (DNOs) require strategies that can offset the tradeoffs new embedded technologies have on their assets. This paper employs modelling to show that through control device manipulation, gas and electric (G&E) network operators can influence savings in energy losses under the presence of plug-in hybrid vehicles (PHEVs) and combined heat and power technologies (CHPs). An integrated gas and electric optimal power flow (OPF) tool is introduced to undertake various case studies. The OPF tool evaluates the technical impacts experienced in the networks when DNOs apply a "plug and forget" operation strategy and then compares the results against a "loss minimisation" strategy. Results show the benefits in applying different strategies are more considerable in electric networks than in gas networks. The study corroborates that an integrated G&E analysis offers a fresh perspective for stakeholders in evaluating energy service networks performance under different operation strategies.
  • Journal article
    Thommyppillai M, Evangelou S, Sharp RS, 2009,

    Rear-heavy car control by adaptive linear optimal preview

    , Vehicle System Dynamics

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