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  • 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
  • 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
    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
  • 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
    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
    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
  • 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-+
  • Conference paper
    Valsera-Naranjo E, Sumper A, Gomis-Bellmunt O, Junyent-Ferre A, Martinez-Rojas Met al., 2009,

    Design of a pitch control of a wind turbine to improve system frequency response

    , 13th European Conference on Power Electronics and Applications (EPE 2009), Publisher: IEEE, Pages: 3978-+
  • Conference paper
    Jones BL, Kerrigan EC, 2009,

    When is the discretization of a PDE good enough for control?

    , IEEE International Conference on Control and Automation, Publisher: IEEE, Pages: 133-+, ISSN: 1948-3449
  • Conference paper
    Astolfi A, Ortega R, Venkatraman A, 2009,

    A Globally Exponentially Convergent Immersion and Invariance Speed Observer for n Degrees of Freedom Mechanical Systems with constraints

    , 1st International Workshop on Networked Embedded and Control System Technologies/European and Russian R&D Cooperation Workshop, Publisher: INSTICC-INST SYST TECHNOLOGIES INFORMATION CONTROL & COMMUNICATION, Pages: 134-+
  • 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
  • Conference paper
    Pin G, Parisini T, 2009,

    Stabilization of Networked Control Systems by Nonlinear Model Predictive Control: A Set Invariance Approach

    , International Workshop on Assessment and Future Directions of Nonlinear Model Predictive Control, Publisher: SPRINGER-VERLAG BERLIN, Pages: 195-204, ISSN: 0170-8643
  • Conference paper
    Pin G, Parisini T, 2009,

    Networked Predictive Control of Constrained Nonlinear Systems: Recursive Feasibility and Input-to-State Stability Analysis

    , American Control Conference 2009, Publisher: IEEE, Pages: 2327-2334, ISSN: 0743-1619
  • Journal article
    Costa EF, Astolfi A, 2009,

    PARTIAL STABILITY FOR A CLASS OF NONLINEAR SYSTEMS

    , SIAM JOURNAL ON CONTROL AND OPTIMIZATION, Vol: 47, Pages: 3203-3219, ISSN: 0363-0129
  • 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
    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.
  • 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 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.
  • Conference paper
    Astolfi A, Ortega R, Venkatraman A, 2009,

    A Globally Exponentially Convergent Immersion and Invariance Speed Observer for n Degrees of Freedom Mechanical Systems

    , Joint 48th IEEE Conference on Decision and Control (CDC) / 28th Chinese Control Conference (CCC), Publisher: IEEE, Pages: 6508-6513, ISSN: 0743-1546
  • Conference paper
    Chang H, Astolfi A, Shim H, 2009,

    Control of Infection Dynamics with Application to HIV/AIDS Model

    , Joint 48th IEEE Conference on Decision and Control (CDC) / 28th Chinese Control Conference (CCC), Publisher: IEEE, Pages: 3533-3538, ISSN: 0743-1546
  • Conference paper
    Casagrande D, Sassano M, Astolfi A, 2009,

    Estimation of the Dynamics of Two-Dimensional Clusters

    , American Control Conference 2009, Publisher: IEEE, Pages: 5428-+, ISSN: 0743-1619
  • Conference paper
    Bell KRW, Fenton W, Griffiths H, McDonald JR, Pal BCet al., 2009,

    The Power Academy in the UK: A Successful Initiative to Attract Graduates to the Power Industry

    , General Meeting of the IEEE-Power-and-Energy-Society, Publisher: IEEE, Pages: 2772-+, ISSN: 1944-9925
  • Conference paper
    Andrieu V, Praly L, Astolfi A, 2009,

    Homogeneity in the bi-limit as a tool for observer and feedback design

    , Joint 48th IEEE Conference on Decision and Control (CDC) / 28th Chinese Control Conference (CCC), Publisher: IEEE, Pages: 1050-1055, ISSN: 0743-1546
  • Conference paper
    Casagrande D, Astolfi A, Ortega R, 2009,

    Asymptotic Stabilization of Passive Systems without Damping Injection: A Sampled Integral-Approximation Technique

    , Joint 48th IEEE Conference on Decision and Control (CDC) / 28th Chinese Control Conference (CCC), Publisher: IEEE, Pages: 4199-4203, ISSN: 0743-1546
  • Conference paper
    Shah D, Ortega R, Astolfi A, 2009,

    Speed and Load Torque Observer for Rotating Machines

    , Joint 48th IEEE Conference on Decision and Control (CDC) / 28th Chinese Control Conference (CCC), Publisher: IEEE, Pages: 6143-6148, ISSN: 0743-1546
  • Conference paper
    Casagrande D, Sassano M, Astolfi A, 2009,

    A Hamiltonian approach to moments-based font recognition

    , Joint 48th IEEE Conference on Decision and Control (CDC) / 28th Chinese Control Conference (CCC), Publisher: IEEE, Pages: 5906-5911, ISSN: 0743-1546
  • Conference paper
    Costa EF, Astolfi A, 2009,

    Bounds related to the Riccati difference equation for linear time varying systems

    , Joint 48th IEEE Conference on Decision and Control (CDC) / 28th Chinese Control Conference (CCC), Publisher: IEEE, Pages: 2321-2326, ISSN: 0743-1546
  • Conference paper
    Costa EF, Astolfi A, 2009,

    Partial Stability for a Class of Nonlinear Systems

    , Joint 48th IEEE Conference on Decision and Control (CDC) / 28th Chinese Control Conference (CCC), Publisher: IEEE, Pages: 1068-1073, ISSN: 0743-1546
  • Conference paper
    Acosta JA, Astolfi A, 2009,

    On the PDEs arising in IDA-PBC

    , Joint 48th IEEE Conference on Decision and Control (CDC) / 28th Chinese Control Conference (CCC), Publisher: IEEE, Pages: 2132-2137, ISSN: 0743-1546

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