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  • Journal article
    Lee CK, Hui SYR, 2010,

    Experimental comparison of traditional and alternating winding method for planar spiral inductor

    , Electronics Letters, Vol: 46, Pages: 238-239, ISSN: 0013-5194

    Two planar winding structures have been built to compare the characteristics of traditional and alternating winding methods. The alternating winding method reduces the potential difference of adjacent conductors, thus reducing substantially the self-capacitance in the winding. Measurements confirmed that the two inductors have similar equivalent inductance and low-frequency series resistance. However, the alternating winding method has a higher self resonant frequency. It is also evident that the reduction of self-capacitance in the winding not only increased the operating bandwidth of the device but also reduced the power losses of the inductor at high frequency. © 2010 The Institution of Engineering and Technology.
  • Journal article
    Lee J, Hong J, Nam K, Ortega R, Praly L, Astolfi Aet al., 2010,

    Sensorless Control of Surface-Mount Permanent-Magnet Synchronous Motors Based on a Nonlinear Observer

    , IEEE TRANSACTIONS ON POWER ELECTRONICS, Vol: 25, Pages: 290-297, ISSN: 0885-8993
  • Journal article
    Zhang X, Polycarpou MM, Parisini T, 2010,

    Fault diagnosis of a class of nonlinear uncertain systems with Lipschitz nonlinearities using adaptive estimation

    , AUTOMATICA, Vol: 46, Pages: 290-299, ISSN: 0005-1098
  • Journal article
    Falugi P, Olaru S, Dumur D, 2010,

    Robust Multi-model Predictive Control Using LMIs

    , INTERNATIONAL JOURNAL OF CONTROL AUTOMATION AND SYSTEMS, Vol: 8, Pages: 169-175, ISSN: 1598-6446
  • Journal article
    Tao X, Hui SYR, 2010,

    A general photo-electro-thermo-temporal theory for light-emitting diode (LED) systems

    , 2010 IEEE Energy Conversion Congress and Exposition, ECCE 2010 - Proceedings, Pages: 184-191

    This paper presents a dynamic photo-electro-thermal theory for LED systems. In addition to photometric, electrical and thermal aspects, this theory incorporates the time domain into the generalized equations. A dynamic model for a general LED system is developed for system analysis. This theory highlights the fact that the luminous output of an LED system will decrease with time from the initial operation to the steady-state due to the rising temperature of the heatsink and the LED devices. The essential thermal time constants involved in the LED systems are explained. The time factor is critical in understanding how much the luminous output will decrease with time and is essential to the optimal designs of LED systems that are operated continuously (e.g general lighting) or momentarily (e.g. traffic lights). Experiments on several LED systems at different time frames have been conducted and the practical measurements confirm the validity of this theory. © 2010 IEEE.
  • Conference paper
    Shahzad A, Kerrigan EC, Constantinides GA, 2010,

    A Fast Well-conditioned Interior Point Method for Predictive Control

    , IEEE Control and Decision Conference

    Interior point methods (IPMs) have proven to be an efficient way of solving quadratic programming problems in predictive control. A linear system of equations needs to be solved in each iteration of an IPM. The ill-conditioning of this linear system in the later iterations of the IPM prevents the use of an iterative method in solving the linear system due to a very slow rate of convergence; in some cases the solution never reaches the desired accuracy. In this paper we propose the use of a well-conditioned, approximate linear system, which increases the rate of convergence of the iterative method. The computational advantage is obtained by the use of an inexact Newton method along with the use of novel preconditioners. Numerical results indicate that the computational complexity of our proposed method scales quadratically with the number of states and linearly with the horizon length.
  • Conference paper
    Howey DA, Holmes AS, Pullen KR, 2010,

    Prediction and measurement of heat transfer in air-cooled disc-type electrical machines

    , 5th IET International Conference on Power Electronics, Machines and Drives (PEMD 2010), Publisher: IET

    Accurate thermal analysis of axial flux permanent magnet (AFPM) machines is crucial in predicting maximum power output. Stator convective heat transfer is one of the most important and least investigated heat transfer mechanisms and is the focus of this paper. Experimental measurements were undertaken using a thin-film electrical heating method, providing radially resolved steady state heat transfer data from an experimental rotor-stator system designed as a geometric mockup of a through-flow ventilated AFPM machine. The measurements are compared with computational fluid dynamics (CFD) simulations using both 2D axisymmetric and 3D models. These were found to give a conservative estimate of heat transfer, with inaccuracies near the edge and in the transitional flow regime. Predicted stator heat transfer was found to be relatively insensitive to the choice of turbulence model and the SST model was used for most of the simulations.
  • Conference paper
    Ahmad MI, Jaimoukha IM, Frangos M, 2010,

    Krylov subspace restart scheme for solving large scale Sylvester equations

    , American Control Conference, ACC 2010
  • Conference paper
    Hasan A, Kerrigan EC, Constantinides GA, 2010,

    An ISS and l-stability Approach to Forward Error Analysis of Iterative Numerical Algorithms

    , IEEE Control and Decision Conference
  • Journal article
    Angeli D, Rawlings JB, 2010,

    Receding Horizon cost optimization and control for nonlinear plants

    , IFAC Proceedings Volumes (IFAC-PapersOnline), Vol: 43, Pages: 1217-1223, ISSN: 1474-6670

    Control performance and cost optimization can be conflicting goals in the management of industrial processes. Even when optimal or optimization-based control synthesis tools are applied, the economic cost associated with plant operation is often only optimized according to static criteria that pick, among all feasible equilibria, those associated to minimal cost. This note collects and illustrates some recent advances in Receding Horizon optimization of nonlinear systems that allow to simultaneously optimize transient and steady-state economic performance. © 2010 IFAC.
  • Journal article
    Astolfi A, Ortega R, Venkatraman A, 2010,

    A globally exponentially convergent immersion and invariance speed observer for mechanical systems with non-holonomic constraints

    , AUTOMATICA, Vol: 46, Pages: 182-189, ISSN: 0005-1098
  • Journal article
    Singh R, Pal BC, Jabr RA, 2010,

    Distribution System State Estimation Through Gaussian Mixture Model of the Load as Pseudo Measurement

    , IET Generation, Transmission and Distribution, Vol: 4, Pages: 50-59

    This study presents an approach to utilise the loads as pseudo-measurements for the purpose of distribution system state estimation (DSSE). The load probability density function (pdf) in the distribution network shows a number of variations at different nodes and cannot be represented by any specific distribution. The approach presented in this study represents all the load pdfs through the Gaussian mixture model (GMM). The expectation maximisation (EM) algorithm is used to obtain the parameters of the mixture components. The standard weighted least squares (WLS) algorithm utilises these load models as pseudomeasurements. The effectiveness of WLS is assessed through some statistical measures such as bias, consistency and quality of the estimates in a 95-bus generic distribution network model.
  • Journal article
    Offer GJ, Howey DA, Contestabile M, Clague R, Brandon NPet al., 2010,

    Comparative analysis of battery electric, hydrogen fuel cell and hybrid vehicles in a future sustainable road transport system

    , Energy Policy, Vol: 38, Pages: 24-29

    This paper compares battery electric vehicles (BEV) to hydrogen fuel cell electric vehicles (FCEV) and hydrogen fuel cell plug-in hybrid vehicles (FCHEV). Qualitative comparisons of technologies and infrastructural requirements, and quantitative comparisons of the lifecycle cost of the powertrain over 100,000 mile are undertaken, accounting for capital and fuel costs. A common vehicle platform is assumed. The 2030 scenario is discussed and compared to a conventional gasoline-fuelled internal combustion engine (ICE) powertrain. A comprehensive sensitivity analysis shows that in 2030 FCEVs could achieve lifecycle cost parity with conventional gasoline vehicles. However, both the BEV and FCHEV have significantly lower lifecycle costs. In the 2030 scenario, powertrain lifecycle costs of FCEVs range from $7360 to $22,580, whereas those for BEVs range from $6460 to $11,420 and FCHEVs, from $4310 to $12,540. All vehicle platforms exhibit significant cost sensitivity to powertrain capital cost. The BEV and FCHEV are relatively insensitive to electricity costs but the FCHEV and FCV are sensitive to hydrogen cost. The BEV and FCHEV are reasonably similar in lifecycle cost and one may offer an advantage over the other depending on driving patterns. A key conclusion is that the best path for future development of FCEVs is the FCHEV.
  • Journal article
    Coetzee LC, Craig IK, Kerrigan EC, 2010,

    Robust Nonlinear Model Predictive Control of a Run-of-Mine Ore Milling Circuit

    , IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY, Vol: 18, Pages: 222-229, ISSN: 1063-6536
  • Conference paper
    Sassano M, Carnevale D, Astolfi A, 2010,

    A Geometric Moment-based Observer for Global Range and Local Orientation Identification

    , American Control Conference, Publisher: IEEE, Pages: 178-183, ISSN: 0743-1619
  • Conference paper
    Clemow P, Green TC, Hernandez-Aramburo CA, 2010,

    Wind Farm Output Smoothing Through Co-ordinated Control and Short-term Wind Speed Prediction

    , IEEE-Power-and-Energy-Society General Meeting, Publisher: IEEE, ISSN: 1944-9925
  • Conference paper
    Couchman IJ, Kerrigan EC, Boehm C, 2010,

    Model reduction of homogeneous-in-the-state bilinear systems with input constraints

    , American Control Conference, Publisher: IEEE, Pages: 2718-2723, ISSN: 0743-1619
  • Conference paper
    Astolfi A, Ortega R, Venkatraman A, 2010,

    Global Observer Design for Mechanical Systems with Non-Holonomic Constraints

    , American Control Conference, Publisher: IEEE, Pages: 202-207, ISSN: 0743-1619
  • Conference paper
    Pin G, Parisini T, 2010,

    Extended Recursively Feasible Model Predictive Control by Two-Stage Online Optimization

    , American Control Conference, Publisher: IEEE, Pages: 5483-5488, ISSN: 0743-1619
  • Conference paper
    Chaudhuri NR, Ray S, Majumder R, Chaudhuri Bet al., 2010,

    Interaction Between Conventional and Adaptive Phasor Power Oscillation Damping Controllers

    , IEEE-Power-and-Energy-Society General Meeting, Publisher: IEEE, ISSN: 1944-9925
  • Conference paper
    Plet CA, Graovac M, Green TC, Iravani Ret al., 2010,

    Fault Response of Grid-Connected Inverter Dominated Networks

    , IEEE-Power-and-Energy-Society General Meeting, Publisher: IEEE, ISSN: 1944-9925
  • Conference paper
    Pin G, Filippo M, Pellegrino FA, Fenu G, Parisini Tet al., 2010,

    Approximate Off-Line Receding Horizon Control of Constrained Nonlinear Discrete-Time Systems: Smooth Approximation of the Control Law

    , American Control Conference, Publisher: IEEE, Pages: 6268-6273, ISSN: 0743-1619
  • Conference paper
    Moreno R, Pudjianto D, Strbac G, 2010,

    Future Transmission Network Operation and Design Standards to Support a Low Carbon Electricity System

    , IEEE-Power-and-Energy-Society General Meeting, Publisher: IEEE, ISSN: 1944-9925
  • Conference paper
    Angeli D, Praly L, 2010,

    Stability Robustness in the presence of exponentially unstable isolated equilibria

    , 49th IEEE Conference on Decision and Control (CDC), Publisher: IEEE, Pages: 1581-1586, ISSN: 0743-1546
  • Conference paper
    Ferrari RMG, Parisini T, Polycarpou MM, 2010,

    Distributed Fault Diagnosis of Large-scale Discrete-time Nonlinear Systems: New Results on the Isolation Problem

    , 49th IEEE Conference on Decision and Control (CDC), Publisher: IEEE, Pages: 1619-1626, ISSN: 0743-1546
  • Conference paper
    Ionescu TC, Astolfi A, 2010,

    On moment matching with preservation of passivity and stability

    , 49th IEEE Conference on Decision and Control (CDC), Publisher: IEEE, Pages: 6189-6194, ISSN: 0743-1546
  • Conference paper
    Couchman IJ, Kerrigan EC, 2010,

    Feedback solution to a bilinear fluid mixing control problem

    , 49th IEEE Conference on Decision and Control (CDC), Publisher: IEEE, Pages: 2966-2971, ISSN: 0743-1546
  • Conference paper
    Sassano M, Astolfi A, 2010,

    Dynamic Solution of the HJB Equation and the Optimal Control of Nonlinear Systems

    , 49th IEEE Conference on Decision and Control (CDC), Publisher: IEEE, Pages: 3271-3276, ISSN: 0743-1546
  • Conference paper
    Astolfi A, 2010,

    Model reduction by moment matching, steady-state response and projections

    , 49th IEEE Conference on Decision and Control (CDC), Publisher: IEEE, Pages: 5344-5349, ISSN: 0743-1546
  • Conference paper
    Evangelou SA, 2010,

    Control of motorcycles by variable geometry rear suspension

    , IEEE International Conference on Control Applications Part of 2010 IEEE Multi-Conference on Systems and Control, Publisher: IEEE, Pages: 148-154, ISSN: 1085-1992

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