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  • Journal article
    Jabr RA, Pal BC, Martins N, 2010,

    A Sequential Conic Programming Approach for the Coordinated and Robust Design of Power System Stabilizers

    , IEEE Transactions on Power Systems, Vol: 25, Pages: 1627-1637

    This paper shows that conic programming is an effective tool to solve robust power system stabilizer (PSS) design problems, namely coordinated gain tuning and coordinated phase and gain tuning. Design robustness is achieved by simultaneously considering several operating scenarios. The method is implemented through a sequence of conic programming runs that define a multivariable root locus along which the eigenvalues move. Specifically, the eigenvalues corresponding to the unstable and poorly damped modes are moved to a conic sector in the left half of the s-plane, whereas the eigenvalues corresponding to the well damped modes are constrained to stay within the boundaries of this conic sector. At each step of the solution, the PSS design parameters are restricted in a trust-region such that the computation of the eigenvalue shift based on the residue method holds valid. The proposed method is demonstrated on a 68-bus test system with nine different operating conditions. Comparisons are carried out between conic programming implementations for PSS coordinated gain tuning and for simultaneous tuning of gain and phase characteristics
  • Journal article
    Angeli D, 2010,

    A Modular Criterion for Persistence of Chemical Reaction Networks

    , IEEE TRANSACTIONS ON AUTOMATIC CONTROL, Vol: 55, Pages: 1674-1679, ISSN: 0018-9286
  • 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 2010 General Meeting
  • Journal article
    Hui SYR, Liu X, 2010,

    Semiconductor transformers

    , Electronics Letters, Vol: 46, Pages: 947-949, ISSN: 0013-5194

    A semiconductor transformer concept in which all parts of the transformer are made of semiconductor materials is described. This proposal transforms the conventional concept of 'magnetic transformers' to 'semiconductor transformers' for easy circuit integration. © 2010 The Institution of Engineering and Technology.
  • Conference paper
    Moreno R, Barroso L, Rudnick H, Bezerra B, Mocarquer S, Flach B, Moreno Jet al., 2010,

    Lessons from Five Years of Experience in Energy Contract Auctions in South America

    , 33th IAEE International Conference
  • Journal article
    Choi WP, Ho WC, Liu X, Hui SYRet al., 2010,

    Bidirectional communication techniques for wireless battery charging systems & portable consumer electronics

    , Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC, Pages: 2251-2257

    Simultaneous power and signal transfer in a wireless/contactless system is an emerging technology for portable electronics. This paper aims at exploring simple and cost effective ways for such applications for a wide range of the portable consumer electronic devices such as mobile phones. Frequency-shift keying (FSK) and amplitude-shift keying (ASK) techniques for an inductive battery charging platform have been successfully implemented for simultaneous power and signal transfer in an 10W wireless charging system. The proposed techniques provide effective bidirectional communication between the charging platform and the loads and form the basis for load identification and battery monitoring in wireless charging system. Considerations of these methods for compatibility among a wide range of portable products are discussed. ©2010 IEEE.
  • Journal article
    Hui SYR, Lin DY, Ng WM, Yan Wet al., 2010,

    A "class-A2" ultra-low-loss magnetic ballast for T5 fluorescent lamps

    , Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC, Pages: 1346-1351

    This paper shows that magnetic ballasts for high-voltage T5 lamps are not only feasible but their luminous and ballast-loss performance can be better than those of electronic ballasts. A computer-aided design and practical implementation of an ultra-low-loss magnetic ballast system for T5 28W lamps is presented. The high-voltage & low-current features of T5 lamps imply that the copper and core losses of the magnetic ballast can be greatly reduced. Its total system power is 30W (with a ballast loss of only 2.42W) is less than the 32W upper limit specified for Class A2 of energy-efficient electronic ballast for T5 28W lamps. High luminous efficacy of 74.8 lumen/W can be achieved. This important breakthrough has the potential of reversing the existing trend of using electronic ballasts as the energy-saving technology in lighting industry. With a better luminous efficacy, lower product and maintenance costs, much longer lifetime and the use of recyclable metallic materials over its electronic counterparts, this patent-pending proposal provides a truly sustainable lighting solution to the lighting industry. ©2010 IEEE.
  • Journal article
    Su YP, Liu X, Lee CK, Hui SYRet al., 2010,

    Relationship of quality factor and hollow winding structure of Coreless Printed Spiral Winding (CPSW) inductor

    , Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC, Pages: 86-91

    The principle of using hollow spiral winding is not novel, but the study on this topic is far from complete. In this paper, how hollow the central region of the Coreless Printed Spiral Winding (CPSW) inductor should be in order to achieve the maximal quality factor value Qmax is explored. A new parameter, namely the ratio of the inner hollow radius and the outer winding radius τ = Rin / Rout, is proposed as an indicator for optimization and used to quantify how hollow a spiral winding is. With the aid of Finite Element Analysis (FEA), the relationship between τ and Q max, which depends on the operating frequency and the dimensional parameters of CPSW inductor, is established. For a specific operating frequency, it is discovered that if the conductor width is comparable with the skin depth, or the conductors are placed relatively far away from each others, the hollow design of the CPSW inductor has little improvement on Q but reduces the inductance. On the contrary, if the conductor width is much larger than the skin depth and the conductors are placed relatively close, the hollow spiral design is recommended. The optimal range of τ with which the Qmax can be achieved is found to be around 0.45 to 0.55. ©2010 IEEE.
  • Journal article
    Zhong WX, Ho WC, Liu X, Hui SYRet al., 2010,

    Self-driven AC-DC synchronous rectifier for power applications - A direct energy-efficient replacement for traditional diode rectifier

    , Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC, Pages: 994-1001

    Synchronous rectification has previously been adopted in switched mode circuits for reducing the conduction losses particularly in low-voltage and high-current applications. This paper presents a generalized "self-driven" AC-DC synchronous rectification technique that can be used to develop AC-DC synchronous rectifier that behaves like a diode bridge, but with much reduced conduction losses and without control integrated circuits. This generalized concept can be extended from single-phase to multi-phase systems. Experiments based on 1kW and 2kW single-phase systems have been successfully conducted for capacitive, inductive and resistive loads. Very significant power loss reduction (over 50%) has been achieved in the rectification stage at both 110V and 220V AC mains operations. This patent-pending circuit can be regarded as a direct replacement of general-purpose diode rectifier. Due to the reduction of power loss, further reduction in the size and cost of the heatsink or thermal management for the power circuit becomes possible. ©2010 IEEE.
  • Journal article
    Hui SYR, Li SN, Tao XH, Chen W, Ng WMet al., 2010,

    A novel passive off-line light-emitting diode (LED) driver with long lifetime

    , Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC, Pages: 594-600

    This paper describes a patent-pending passive offline LED driver that has no semiconductor switches, electrolytic capacitors, auxiliary power supply and control board. It can provide a fairly smooth current from the ac mains to drive LED strings. The new circuit has the advantages of high input power factor, high energy efficiency and luminous efficacy, long lifetime, stable luminous output and high robustness against extreme weather conditions. In addition, over 90% of the driver material is recyclable, leading to reduction of electronic waste. It is particularly suitable public LED lighting systems such as road lighting systems. Experimental results based on a 50W system are included in the paper to confirm the validity of the proposal. Due to the circuit simplicity, an energy efficiency exceeding 93.6% has been achieved. ©2010 IEEE.
  • Software
    E J Van Wyk, P Falugi, E C Kerrigan, 2010,

    ICLOCS

    Solves nonlinear optimal control problems subject to constraints.
  • Journal article
    Chaudhuri NR, Chaudhuri B, Ray S, Majumder Ret al., 2010,

    Wide-area phasor power oscillation damping controller: a new approach to handling time-varying signal latency

    , IET GENERATION TRANSMISSION & DISTRIBUTION, Vol: 4, Pages: 620-630, ISSN: 1751-8687
  • Journal article
    Carnevale D, Karagiannis D, Astolfi A, 2010,

    A Condition for Certainty Equivalence Output Feedback Stabilization of Nonlinear Systems

    , IEEE TRANSACTIONS ON AUTOMATIC CONTROL, Vol: 55, Pages: 1180-1185, ISSN: 0018-9286
  • Journal article
    Ledyaev YS, Vinter RB, 2010,

    Discontinuous feedback in nonlinear control: Stabilization under persistent disturbances

    , PROCEEDINGS OF THE STEKLOV INSTITUTE OF MATHEMATICS, Vol: 268, Pages: 222-241, ISSN: 0081-5438
  • Journal article
    Colet-Subirachs A, Gomis-Bellmunt O, Clos-Costa D, Martin-Segura G, Junyent-Ferre A, Villafafila-Robles R, Ferrer-Marti Let al., 2010,

    Electromechanical Modelling and Control of a Micro-Wind Generation System for Isolated Low Power DC Micro Grids

    , EPE JOURNAL, Vol: 20, Pages: 42-48, ISSN: 0939-8368
  • Journal article
    Parisini T, 2010,

    Control Systems Technology: Towards a Systems-of-Systems Perspective?

    , IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY, Vol: 18, Pages: 249-250, ISSN: 1063-6536
  • 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
    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
    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
  • 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
  • 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

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