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  • Journal article
    Laila DS, Messina AR, Pal BC, 2009,

    A refined Hilbert-Huang transform with applications to interarea oscillation monitoring

    , IEEE Transactions on Power Systems, Vol: 24, Pages: 610-620, ISSN: 0885-8950

    This paper focuses on the refinement of standard Hilbert–Huang transform (HHT) technique to accurately characterize time varying, multicomponents interarea oscillations. Several improved masking techniques for empirical mode decomposition (EMD) and a local Hilbert transformer are proposed and a number of issues regarding their use and interpretation are identified. Simulated response data from a complex power system model are used to assess the efficacy of the proposed techniques for capturing the temporal evolution of critical system modes. It is shown that the combination of the proposed methods result in superior frequency and temporal resolution than other approaches for analyzing complicated nonstationary oscillations.
  • Journal article
    Angeli D, 2009,

    Convergence in Networks With Counterclockwise Neural Dynamics

    , IEEE TRANSACTIONS ON NEURAL NETWORKS, Vol: 20, Pages: 794-804, ISSN: 1045-9227
  • Journal article
    Angeli D, De Leenheer P, Sontag ED, 2009,

    Chemical Networks with Inflows and Outflows: A Positive Linear Differential Inclusions Approach

    , BIOTECHNOLOGY PROGRESS, Vol: 25, Pages: 632-642, ISSN: 8756-7938
  • Journal article
    Angeli D, Hirsch MW, Sontag ED, 2009,

    Attractors in coherent systems of differential equations

    , JOURNAL OF DIFFERENTIAL EQUATIONS, Vol: 246, Pages: 3058-3076, ISSN: 0022-0396
  • Journal article
    Su YP, Liu X, Hui SYR, 2009,

    Mutual Inductance Calculation of Movable Planar Coils on Parallel Surfaces

    , IEEE Transactions on Power Electronics, Vol: 24, Pages: 1115-1123
  • Journal article
    Chang H, Astolfi A, 2009,

    Activation of Immune Response in Disease Dynamics via Controlled Drug Scheduling

    , IEEE TRANSACTIONS ON AUTOMATION SCIENCE AND ENGINEERING, Vol: 6, Pages: 248-255, ISSN: 1545-5955
  • Journal article
    Ferrari RMG, Parisini T, Polycarpou MM, 2009,

    Distributed Fault Diagnosis With Overlapping Decompositions: An Adaptive Approximation Approach

    , IEEE TRANSACTIONS ON AUTOMATIC CONTROL, Vol: 54, Pages: 794-799, ISSN: 0018-9286
  • Patent
    Yeatman EM, Mitcheson PD, 2009,

    Electrical Generator

    , WO/2009/034321
  • Journal article
    Tam PW, Chung HSH, Hui SY, 2009,

    Iterative behavioral modeling of charge-pump-based electronic ballast-fluorescent lamp system

    , IEEE Transactions on Power Electronics, Vol: 24, Pages: 278-287, ISSN: 0885-8993

    A new behavioral model for analyzing the current-source charge-pump-based ballast with a self-oscillatory gate drive circuit is proposed in this paper. A detailed model derivation is presented and the model is applied to analyze a ballast system of a 16-W compact fluorescent lamp (CFL) as an illustration. The ballast of the CFL consists of a self-oscillatory driven inverter stage and charge pump circuitry. The iterative modeling technique links together the three mutual dependent parts of the system, namely: 1) the charge pump circuit; 2) the self-oscillatory gate drive; and 3) the lamp model, so that they can be designed and studied as an integrated system. It is shown that the model can give a comprehensive interpretation of the whole system and provide a reasonable prediction of the ballast behavior. © 2009 IEEE.
  • Journal article
    Astolfi A, Ortega R, 2009,

    Dynamic extension is unnecessary for stabilization via interconnection and damping assignment passivity-based control

    , SYSTEMS & CONTROL LETTERS, Vol: 58, Pages: 133-135, ISSN: 0167-6911
  • Journal article
    Andrieu V, Praly L, Astolfi A, 2009,

    High gain observers with updated gain and homogeneous correction terms

    , AUTOMATICA, Vol: 45, Pages: 422-428, ISSN: 0005-1098
  • Journal article
    Chan PKW, Chung HSH, Hui SY, 2009,

    A generalized theory of boundary control for a single-phase multilevel inverter using second-order switching surface

    , IEEE Transactions on Power Electronics, Vol: 24, Pages: 2298-2313, ISSN: 0885-8993

    An extension of the use of the boundary control method using second-order switching functions for controlling single-phase multilevel inverters is presented in this paper. The time instant of switching the output voltage of the inverter bridge from one voltage level to another voltage level is governed by two second-order switching functions. The input variables of the switching functions are the input and output voltages of the inverter, reference output voltage, and output filter capacitor current. The switching functions are derived by first estimating the respective trajectories of the output voltage of the inverter with the two possible voltage levels from the inverter bridge supplying to the input of the output filter, and then formulating mathematical functions to approximate the two trajectories (one for each voltage level) that pass through the target operating point. The distinct feature of this method is that the output voltage of the inverter can reach the target operating point in two switching actions in the inverter bridge after the inverter is subjected to an external disturbance. Derivation of the switching functions and implementation of the controller will be given. Three single-phase inverter topologies, including cascaded five-level inverter, hybrid seven-level inverter, and three-level diode-clamped inverter, with the proposed control method have been built and tested. The steady-state and largesignal dynamic responses of the three inverters supplying to three different load types, including resistive, inductive, and nonlinear diode-capacitor circuits, will be discussed. © 2009 IEEE.
  • Journal article
    Lin D, Yan W, Zissis G, Hui SYRet al., 2009,

    A simple physical low pressure discharge lamp model

    , 2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009, Pages: 2051-2058

    A simple physical low pressure discharge lamp model has been proposed in this paper. The new model is based on the physical processes inside a fluorescent lamp by considering the increasing rate of electron density and the ambipolar diffusion process. The model can accurately predict not only the lamp electrical terminal characteristics but also the electron density and electron temperature inside the fluorescent lamp. The results are comparable with the predictions from the complicated plasma models. The simple lamp model can accurately predict the lamp characteristics at both high and low operating frequencies, and the voltage spikes caused by arc re-ignition at each half cycle when the lamp is operated at mains frequency. This model can be easily implemented into MATLAB/Simulink as a simple, accurate and user-friendly CAD tool. © 2009 IEEE.
  • Journal article
    Lin DY, Yan W, Hui SYR, Qin YXet al., 2009,

    An improved semi-theoretical fluorescent lamp model for dimmable applications

    , Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC, Pages: 819-825

    Due to the energy-saving and environmentally friendly features, dimmable magnetic ballasts will be paid more attention in the future. This make a more accurate fluorescent lamp model at different dimming levels necessary at low operating frequency. This paper presents a new method that considers the effect of tube temperature at different dimming levels in the process of the analysis of the fluorescent lamp model. The model is verified favorably by the comparison between the simulation results and experimental results. It's clear that after the effect of tube temperature at different dimming levels is considered, the model becomes more accurate and reliable than before. This model can be used to design dimmable magnetic ballast. Hence, the proposed model shows a good degree of accuracy for a large dimming range at different operating frequencies. ©2009 IEEE.
  • Journal article
    Qin YX, Lin DY, Chung HSH, Yan W, Hui SYRet al., 2009,

    Dynamic control of a light-emitting diode system based on the general photo-electro-thermal theory

    , 2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009, Pages: 2815-2820

    This paper presents a dynamic thermal model of a LED system and a control strategy for optimal power point tracking (OPPT). The control strategy is based on the general theory which links the photometric, electric and thermal behaviors of LEDs together. The control implementation enables the optimal operating of the LED systems to be determined dynamically. By measuring the ambient temperature and the heatsink temperature of LED system, the proposed control scheme allows the LED system to operate at the optimal dynamic operating points at which maximum luminous flux is generated. Practical tests have been carried out to verify the model and the general theory. © 2009 IEEE.
  • Conference paper
    Angeli D, 2009,

    A Tutorial on Chemical Reaction Network Dynamics

    , 10th European Control Conference, Publisher: ELSEVIER, Pages: 398-406, ISSN: 0947-3580
  • Journal article
    Selmic RR, Polycarpou MM, Parisini T, 2009,

    Actuator Fault Detection in Nonlinear Uncertain Systems Using Neural On-line Approximation Models

    , EUROPEAN JOURNAL OF CONTROL, Vol: 15, Pages: 29-44, ISSN: 0947-3580
  • Journal article
    Angeli D, Sontag ED, 2009,

    Oscillations in I/O Monotone Systems Under Negative Feedback

    , IEEE T AUTOMAT CONTR, Pages: 166-176, ISSN: 0018-9286

    Oscillatory behavior is a key property of many biological systems. The small-gain theorem (SGT) for input/output monotone systems provides a sufficient condition for global asymptotic stability of an equilibrium, and hence its violation is a necessary condition for the existence of periodic solutions. One advantage of the use of the monotone SGT technique is its robustness with respect to all perturbations that preserve monotonicity and stability properties of a very low-dimensional (in many interesting examples, just one-dimensional) model reduction. This robustness makes the technique useful in the analysis of molecular biological models in which there is large uncertainty regarding the values of kinetic and other parameters. However, verifying the conditions needed in order to apply the SGT is not always easy. This paper provides an approach to the verification of the needed properties and illustrates the approach through an application to a classical model of circadian oscillations, as a nontrivial "case study," and provides a theorem in the converse direction of predicting oscillations when the SGT conditions fail.
  • Journal article
    Tan Y, Nesic D, Mareels IMY, Astolfi Aet al., 2009,

    On global extremum seeking in the presence of local extrema

    , AUTOMATICA, Vol: 45, Pages: 245-251, ISSN: 0005-1098
  • Journal article
    Jabr RA, Pal BC, 2009,

    Intermittent Wind Generation in Optimal Power Flow Dispatching

    , IET Generation, Transmision and Distribution, Vol: 3, Pages: 66-74
  • Conference paper
    McDonald JDF, Pal BC, Lang PD, 2009,

    Significance of an Operational Measure of Distribution Network Reliability

    , General Meeting of the IEEE-Power-and-Energy-Society, Publisher: IEEE, Pages: 3935-3942, ISSN: 1944-9925
  • Conference paper
    Simfukwe D, Pal BC, Begovic M, Divan D, Song Yet al., 2009,

    Control of power system static stability using distributed static series compensators

    , General Meeting of the IEEE-Power-and-Energy-Society, Publisher: IEEE, Pages: 3994-3999, ISSN: 1944-9925
  • Conference paper
    Ahmadi AR, Green TC, 2009,

    Optimal Power Flow for Autonomous Regional Active Network Management System

    , General Meeting of the IEEE-Power-and-Energy-Society, Publisher: IEEE, Pages: 4536-4542, ISSN: 1944-9925
  • Conference paper
    He C, Arora A, Kiziroglou ME, Yates DC, O'Hare D, Yeatman EMet al., 2009,

    MEMS Energy Harvesting Powered Wireless Biometric Sensor

    , Wearable and Implantable Body Sensor Networks, 2009. BSN 2009. Sixth International Workshop on, Pages: 207-212

    One of the main challenges in developing wireless biometric sensors is the requirement for integration of various systems into a very compact device. Such systems include sensing units, conditioning electronics, transmitters and power supplies. In this work, a novel system integration architecture is presented. A unique feature of this new architecture is that the sub-systems are selected and designed for direct output-to-input connection. An array of active pH sensors is used to transform a pH level to an electrical potential in the range of 0 - 2 Volts. This signal is amplified by an electrostatic energy harvester suitable for human motion operation. The amplified signal drives a custom LC transmitter specially designed to suit the harvester output. A system of notable simplicity is achieved and may serve as a demonstrator for other wireless sensors.
  • Conference paper
    Moreno R, Vasilakos C, Pudjianto D, Strbac Get al., 2009,

    A Cost-Benefit Approach for Transmission Investment with a Non-Linear Transmission Cost Function

    , Bucharest PowerTech Conference, Publisher: IEEE, Pages: 2387-2390
  • Conference paper
    Clarke FH, Vinter RB, 2009,

    Stability analysis of sliding-mode feedback control

    , Conference on 50 Years of Optimal Control, Publisher: POLISH ACAD SCIENCES SYSTEMS RESEARCH INST, Pages: 1169-1192, ISSN: 0324-8569
  • Conference paper
    Moreno R, Vasilakos C, Castro M, Pudjianto D, Strbac Get al., 2009,

    Impact of Wind Generation Intermittency on Transmission Expansion Models

    , CIGRE/IEEE PES Joint Symposium on Integration of Wide-Scale Renewable Resources into the Power Delivery System, Publisher: IEEE, Pages: 110-116
  • Conference paper
    Pezzini P, Gomis-Bellmunt O, Gonzalez-de-Miguel C, Junyent-Ferre A, Sudria-Andreu Aet al., 2009,

    FACTS location using Genetic Algorithm to increase energy efficiency in distribution networks

    , 13th European Conference on Power Electronics and Applications (EPE 2009), Publisher: IEEE, Pages: 1308-1315
  • Conference paper
    Gomis-Bellmunt O, Junyent-Ferre A, Sumper A, Sudria-Andreu A, Mata M, Sala Met al., 2009,

    Control of a doubly-fed induction generator under unbalanced conditions considering the converter limits

    , 13th European Conference on Power Electronics and Applications (EPE 2009), Publisher: IEEE, Pages: 1718-+
  • Conference paper
    Mata-Dumenjo M, Sanchez-Navarro J, Rossetti M, Junyent-Ferre A, Gomis-Bellmunt Oet al., 2009,

    Integrated Simulation of a Doubly Fed Induction Generator Wind Turbine

    , 13th European Conference on Power Electronics and Applications (EPE 2009), Publisher: IEEE, Pages: 3572-+

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