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  • Conference paper
    Astolfi A, Praly L, 2011,

    A LaSalle version of Matrosov theorem

    , 50th IEEE Conference of Decision and Control (CDC)/European Control Conference (ECC), Publisher: IEEE, Pages: 320-324, ISSN: 0743-1546
  • Conference paper
    Yalcin Y, Astolfi A, 2011,

    Discrete Time Immersion and Invariance Adaptive Control for Systems in Strict Feedback Form

    , 50th IEEE Conference of Decision and Control (CDC)/European Control Conference (ECC), Publisher: IEEE, Pages: 343-347, ISSN: 0743-1546
  • Conference paper
    Ionescu TC, Astolfi A, 2011,

    Moment matching for linear port Hamiltonian systems

    , 50th IEEE Conference of Decision and Control (CDC)/European Control Conference (ECC), Publisher: IEEE, Pages: 7164-7169, ISSN: 0743-1546
  • Conference paper
    Sassano M, Astolfi A, 2011,

    Approximate Finite-Horizon Optimal Control without PDE's

    , 50th IEEE Conference of Decision and Control (CDC)/European Control Conference (ECC), Publisher: IEEE, Pages: 1716-1721, ISSN: 0743-1546
  • Conference paper
    Boem F, Ferrari RMG, Parisini T, Polycarpou MMet al., 2011,

    A Distributed Fault Detection Methodology for a Class of Large-scale Uncertain Input-output Discrete-Time Nonlinear Systems

    , 50th IEEE Conference of Decision and Control (CDC)/European Control Conference (ECC), Publisher: IEEE, Pages: 897-902, ISSN: 0743-1546
  • Conference paper
    Angeli D, Amrit R, Rawlings JB, 2011,

    Enforcing Convergence in Nonlinear Economic MPC

    , 50th IEEE Conference of Decision and Control (CDC)/European Control Conference (ECC), Publisher: IEEE, Pages: 3387-3391, ISSN: 0743-1546
  • Conference paper
    Zhang Z, Jaimoukha IM, 2011,

    An optimal solution to an H-/H-infinity fault detection problem

    , 50th IEEE Conference of Decision and Control (CDC)/European Control Conference (ECC), Publisher: IEEE, Pages: 903-908, ISSN: 0743-1546
  • Conference paper
    Angeli D, Sontag ED, 2011,

    A small-gain result for orthant-monotone systems in feedback: the non sign-definite case

    , 50th IEEE Conference of Decision and Control (CDC)/European Control Conference (ECC), Publisher: IEEE, Pages: 6049-6053, ISSN: 0743-1546
  • Conference paper
    Bloemink JM, Green TC, 2011,

    Reducing Passive Filter Sizes with Tuned Traps for Distribution Level Power Electronics

    , 14th European Conference on Power Electronics and Applications (EPE)/ECCE Europe Conference on Power Electronics and Adjustable Speed Drives - Towards the 20-20-20 Target, Publisher: IEEE, ISSN: 2325-0313
  • Conference paper
    Soto-Sanchez D, Green TC, 2011,

    Control of a modular multilevel converter-based HVDC transmission system

    , 14th European Conference on Power Electronics and Applications (EPE)/ECCE Europe Conference on Power Electronics and Adjustable Speed Drives - Towards the 20-20-20 Target, Publisher: IEEE, ISSN: 2325-0313
  • Conference paper
    Sokolov M, Green TC, Mitcheson PD, Shmilovitz Det al., 2011,

    Small-signal Model of Photovoltaic Power Converter for Selection of Perturb and Observe Algorithm Step Time

    , 14th European Conference on Power Electronics and Applications (EPE)/ECCE Europe Conference on Power Electronics and Adjustable Speed Drives - Towards the 20-20-20 Target, Publisher: IEEE, ISSN: 2325-0313
  • Conference paper
    Plet CA, Green TC, 2011,

    A Method of Voltage Limiting and Distortion Avoidance for Islanded Inverter-Fed Networks under Fault

    , 14th European Conference on Power Electronics and Applications (EPE)/ECCE Europe Conference on Power Electronics and Adjustable Speed Drives - Towards the 20-20-20 Target, Publisher: IEEE, ISSN: 2325-0313
  • Journal article
    Angeli D, Kountouriotis PA, 2011,

    Decentralized random control of refrigerator appliances

    , IFAC Proceedings Volumes (IFAC-PapersOnline), Vol: 44, Pages: 12144-12149, ISSN: 1474-6670

    This paper considers the problem of dynamic demand management of domestic refrigerators. Dynamic demand management is a promising research direction, which aims to improve power system resilience, by dynamically controlling the energy consumption of devices that exhibit thermal energy storage. In this approach, the operating temperature of appliances, and thus their energy consumption, is modified dynamically, within a safe range, in response to mains frequency fluctuations. Such an operating scheme aims at reducing the strain that the demand side introduces in a power network, when the corresponding supply is temporarily disrupted. Previous research has highlighted the potential of this idea for responding to sudden power plant outages. However, deterministic control schemes have proved inadequate as individual appliances tend to "synchronize" with each other, leading to unacceptable levels of overshoot in energy demand, when they "recover" their steady-state operating cycles. In this paper we describe random controllers that are able to respond to sudden plant outages and which avoid the instability phenomena associated with other feedback strategies. Stochasticity is used to achieve desynchronization of individual refrigerators while keeping overall power consumption tightly regulated. © 2011 IFAC.
  • Conference paper
    Mayne DQ, Kerrigan EC, Falugi P, 2011,

    Robust model predictive control: Advantages and disadvantages of tube-based methods

    , Pages: 191-196, ISSN: 1474-6670

    An important reason for the success of model predictive control is the fact that, for deterministic systems, feedback and open-loop control are equivalent so that 'optimal' (but implicit) feedback may be obtained by solving an open-loop optimal control problem at each state encountered. This equivalence is not maintained in the presence of uncertainty complicating the development of robust model predictive control. The advantages and limitations of tubebased model predictive control for dealing with uncertainty of various forms are discussed, firstly in the context of constrained linear systems, and an extension to deal with robustness against unstructured uncertainty is briefly described. Tube-based control requires the determination both of a nominal or reference trajectory and an ancillary controller that constrains deviations of the state of the uncertain systems from the nominal trajectory and is difficult to extend to nonlinear systems. A novel ancillary controller for tube-based control of constrained nonlinear systems with additive disturbances that overcomes some disadvantages of a previous version and is relatively simple to implement is described and assessed; the addition of a terminal equality constraint to the nominal optimal control problem and its removal from the ancillary optimal control problem simplifies the analysis, removes some restrictive assumptions, and enables stronger results to be obtained. © 2011 IFAC.
  • Journal article
    Buchstaller D, Kerrigan EC, Constantinides GA, 2011,

    Sampling and controlling faster than the computational delay

    , IFAC Proceedings Volumes (IFAC-PapersOnline), Vol: 44, Pages: 7523-7528, ISSN: 1474-6670

    For a sampled-data control system, the sampling period is chosen smaller than the computational delay, an approach we call intra-delay sampling. Utilising parallel computing architectures, it is shown that intra-delay sampling schemes are feasible and that they yield better performance than their slower sampling counterparts. © 2011 IFAC.
  • Conference paper
    Kockar I, Papadaskalopoulos D, Strbac G, Pudjianto D, Galloway S, Burt Get al., 2011,

    Dynamic Pricing in Highly Distributed Power Systems of the Future

    , General Meeting of the IEEE-Power-and-Energy-Society (PES), Publisher: IEEE, ISSN: 1944-9925
  • Book chapter
    Giarré L, Falugi P, Badalamenti R, 2011,

    Hybrid LPV Modeling and Identification

    , Linear Parameter-Varying System Identification New Developments and Trends, Publisher: World Scientific, Pages: 11-39, ISBN: 9789814355452

    This review volume reports the state-of-the-art in Linear Parameter Varying (LPV) system identification.
  • Conference paper
    Boem F, Pellegrino FA, Fenu G, Parisini Tet al., 2011,

    Trajectory clustering by means of Earth Mover's Distance

    , Pages: 4741-4746, ISSN: 1474-6670

    We propose a method for trajectory classification based on a general cluster-based methodology, that can be used both off-line in an unsupervised fashion, both on-line, classifying new trajectories or part of them. We use the Earth Mover's Distance (EMD) and we adapt it in order to employ it as a tool for trajectory clustering. We propose a novel effective method to identify the clusters' representatives by means of the p-median location problem. This methodology is able to manage different length and noisy trajectories and takes velocity profiles and stops into account. We discuss the experimental results and we compare our approach with other trajectory clustering methods. © 2011 IFAC.
  • Conference paper
    Dib W, Ortega R, Astolfi A, Hill Det al., 2011,

    Improving Transient Stability of Multi-Machine Power Systems: Synchronization via Immersion of a Pendular System

    , American Control Conference (ACC), Publisher: IEEE, ISSN: 0743-1619
  • Conference paper
    Wee T-C, Astolfi A, Ming-Xie, 2011,

    HUMANOID ROBOT Modular-Joint Design of a TPINOKIO Bipedal Robot

    , 8th International Conference on Informatics in Control, Automation and Robotics, Publisher: INSTICC-INST SYST TECHNOLOGIES INFORMATION CONTROL & COMMUNICATION, Pages: 185-190
  • Conference paper
    Barocio E, Pal BC, Messina AR, 2011,

    Real-Time Monitoring as Enabler for Smart Transmission Grids

    , General Meeting of the IEEE-Power-and-Energy-Society (PES), Publisher: IEEE, ISSN: 1944-9925
  • Conference paper
    Pin G, Parisini T, 2011,

    Robust Minimum-time Constrained Control of Nonlinear Discrete-Time Systems: New Results

    , 50th IEEE Conference of Decision and Control (CDC)/European Control Conference (ECC), Publisher: IEEE, Pages: 1710-1715, ISSN: 0743-1546
  • Conference paper
    Bonnabel S, Astolfi A, Sepulchre R, 2011,

    Contraction and Observer Design on Cones

    , 50th IEEE Conference of Decision and Control (CDC)/European Control Conference (ECC), Publisher: IEEE, Pages: 7147-7151, ISSN: 0743-1546
  • Journal article
    Shahzad A, Jones BL, Kerrigan EC, Constantinides GAet al., 2011,

    An efficient algorithm for the solution of a coupled Sylvester equation appearing in descriptor systems

    , Automatica, Vol: 47, Pages: 244-248, ISSN: 1873-2836

    Descriptor systems consisting of a large number of differential-algebraic equations (DAEs) usually arise from the discretization of partial differential-algebraic equations. This paper presents an efficient algorithm for solving the coupled Sylvester equation that arises in converting a system of linear DAEs to ordinary differential equations. A significant computational advantage is obtained by exploiting the structure of the involved matrices. The proposed algorithm removes the need to solve a standard Sylvester equation or to invert a matrix. The improved performance of this new method over existing techniques is demonstrated by comparing the number of floating-point operations and via numerical examples.
  • Conference paper
    Pipelzadeh Y, Chaudhuri B, Green TC, 2011,

    Coordinated Damping Control Through MultipleHVDC Systems: A Decentralized Approach

    , IEEE Power and Energy Society General Meeting 2011

    The role of multiple HVDC links - both CSC and VSC - in improving the AC system dynamic performance is presented here. An Australian equivalent system with three critical interareamodes is considered to illustrate the case study on DIgSILENT PowerFactory. Subspace-based multi-input-multi-output(MIMO) system identification is used to estimate and validatelinearized state-space models through pseudo random binary sequence (PRBS) probing in DIgSILENT PowerFactory. Choice of appropriate input-output combinations is done through modalresidue analysis taking note of not only the magnitudes but also the phase angles. The decentralized control design is posed as an optimization problem and solved using an evolutionary technique. The results are validated through linear analysis andnon linear simulation in DIgSILENT for two extreme (light and heavy loading) operating conditions.
  • Journal article
    Mancarella P, Gan CK, Strbac G, 2011,

    Optimal design of low-voltage distribution networks for CO2 emission minimisation. Part I: model formulation and circuit continuous optimisation

    , IET GENERATION TRANSMISSION & DISTRIBUTION, Vol: 5, Pages: 38-46, ISSN: 1751-8687
  • Journal article
    Mancarella P, Gan CK, Strbac G, 2011,

    Optimal design of low-voltage distribution networks for CO2 emission minimisation. Part II: Discrete optimisation of radial networks and comparison with alternative design strategies

    , IET GENERATION TRANSMISSION & DISTRIBUTION, Vol: 5, Pages: 47-56, ISSN: 1751-8687
  • Journal article
    Pin G, Parisini T, 2011,

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

    , IEEE TRANSACTIONS ON AUTOMATIC CONTROL, Vol: 56, Pages: 72-87, ISSN: 0018-9286
  • Journal article
    Bettiol P, Bressan A, Vinter RB, 2011,

    ESTIMATES FOR TRAJECTORIES CONFINED TO A CONE IN R-n

    , SIAM JOURNAL ON CONTROL AND OPTIMIZATION, Vol: 49, Pages: 21-41, ISSN: 0363-0129
  • Journal article
    Chaudhuri NR, Chakraborty D, Chaudhuri B, 2011,

    An Architecture for FACTS Controllers to Deal With Bandwidth-Constrained Communication

    , IEEE TRANSACTIONS ON POWER DELIVERY, Vol: 26, Pages: 188-196, ISSN: 0885-8977

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