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  • Journal article
    De Paola A, Angeli D, Strbac G, 2016,

    Scheduling of Wind Farms for Optimal Frequency Response and Energy Recovery

    , IEEE Transactions on Control Systems Technology, Vol: 24, Pages: 1764-1778, ISSN: 1063-6536

    This paper deals with control of variable speed wind turbines, which provide frequency support through temporary overproduction. In particular, it determines the optimal profile of power extraction among multiple generators in order to minimize the total loss of efficiency, while allowing for a prescribed increase in generation. Starting with the simplifying assumption of unconstrained generated/supplied power for the single turbine, the scheduling is characterized as the solution of an optimal control problem. On the basis of this result, a heuristic control strategy is proposed for the case of turbines with limited power output, investigating under which conditions this choice achieves optimality. Using a similar approach, the problem of energy recovery is also considered, calculating the optimal power profiles that bring back the turbines to their working point of maximum efficiency after having provided frequency response.
  • Conference paper
    Sun M, Konstantelos I, Strbac G, 2016,

    Analysis of diversified residential demand in London using smart meter and demographic data

    , 2016 IEEE PES General Meeting, Publisher: IEEE

    In the interest of economic efficiency, design of distribution networks should be taillored to the demonstrated needs of its consumers. However, in the absence of detailed knowledge related to the characteristics of electricity consumption, planning has traditionally been carried out on the basis of empirical metrics; conservative estimates of individual peak consumption levels and of demand diversification across multiple consumers. Although such practices have served the industry well, the advent of smart metering opens up the possibility for gaining valuable insights on demand patterns, resulting in enhanced planning capabilities. This paper is motivated by the collection of demand measurements across 2,639 households in London, as part of Low Carbon London project’s smart-metering trial. Demand diversity and other metrics of interest are quantified for the entire dataset as well as across different customer classes, investigating the degree to which occupancy level and wealth can be used to infer peak demand behavior.
  • Journal article
    Luo X, Lee CK, Ng WM, Yan S, Chaudhuri B, Hui SYRet al., 2016,

    Use of adaptive thermal storage system as smart load for voltage control and demand response

    , IEEE Transactions on Smart Grid, Vol: 8, Pages: 1231-1241, ISSN: 1949-3053

    This paper describes how a large-scale ice-thermal storage can be turned into a smart load for fast voltage control and demand-side management in power systems with intermittent renewable power, while maintaining its existing function of load shaving. The possibility of modifying a conventional thermal load has been practically demonstrated in a refrigerator using power electronics technology. With the help of an electric spring, the modified thermal load can reduce power imbalance in buildings while providing active and reactive power compensation for the power grid. Based on practical data, a building energy model incorporating a large-scale ice-thermal storage system has been successfully used to demonstrate the advantageous demand-response features using computer simulation of both grid connected and isolated power systems. The results indicate the potential of using ice-thermal storage in tall buildings in reducing voltage and frequency fluctuations in weak power grids.
  • Conference paper
    Singh A, Pal B, 2016,

    An extended linear quadratic regulator and its application for control of power system dynamics

    , IEEE First International Conference on Control, Measurement and Instrumentation (CMI), Publisher: IEEE, Pages: 110-114

    This paper presents a generalized solution to the problem of optimal control of systems having an extra set of exogenous inputs besides control inputs. The solution is derived in the framework of linear quadratic control and it is termed `extended linear quadratic regulator (ELQR)'. The ELQR is applied for control of unstable or poorly damped oscillatory dynamics occurring in a power system and is shown to be significantly more cost effective than the classical power system stabilizer (PSS) based approach.
  • Conference paper
    Majumdar A, Pal BC, 2016,

    A three-phase state estimation in unbalanced distribution networks with switch modelling

    , 1st IEEE International Conference on Control, Measurement and Instrumentation (CMI), Publisher: IEEE, Pages: 474-478

    State estimation has become an important task in modern energy/distribution management systems. However, the state estimation is not very popular in modern unbalanced three-phase distribution systems. This paper proposes a method for three-phase state estimation with detailed three-phase modelling of system components including switches and star and delta connected loads. This method is then tested on a standard IEEE 13-bus system and the results are compared with load flow results.
  • Journal article
    Sootla A, Oyarzun DA, Angeli D, Stan GBet al., 2016,

    Shaping Pulses to Control Bistable Systems: Analysis, Computation and Counterexamples

    , Automatica, Vol: 63, Pages: 254-264, ISSN: 1873-2836

    In this paper we study how to shape temporal pulses to switch a bistable system between its stable steady states. Our motivation forpulse-based control comes from applications in synthetic biology, where it is generally difficult to implement real-time feedback controlsystems due to technical limitations in sensors and actuators. We show that for monotone bistable systems, the estimation of the set ofall pulses that switch the system reduces to the computation of one non-increasing curve. We provide an efficient algorithm to computethis curve and illustrate the results with a genetic bistable system commonly used in synthetic biology. We also extend these results tomodels with parametric uncertainty and provide a number of examples and counterexamples that demonstrate the power and limitationsof the current theory. In order to show the full potential of the framework, we consider the problem of inducing oscillations in a monotonebiochemical system using a combination of temporal pulses and event-based control. Our results provide an insight into the dynamics ofbistable systems under external inputs and open up numerous directions for future investigation.
  • Journal article
    Al-Radhawi MA, Angeli D, 2016,

    New approach to the stability of chemical reaction networks: piecewise linear in rates Lyapunov functions

    , IEEE Transactions on Automatic Control, Vol: 61, Pages: 76-89, ISSN: 1558-2523

    Piecewise-linear in rates (PWLR) Lyapunov functions are introduced for a class of chemical reaction networks (CRNs). In addition to their simple structure, these functions are robust with respect to arbitrary monotone reaction rates, of which Mass-Action is a special case. The existence of such functions ensures the convergence of trajectories towards equilibria, and can be used to establish their asymptotic stability with respect to the corresponding stoichiometric compatibility class. We give the definition of these Lyapunov functions, prove their basic properties, and provide algorithms for constructing them. Examples are provided, relationship with consensus dynamics are discussed, and future directions are elaborated.
  • Journal article
    Kunjumuhammed LP, Pal BC, Oates C, Dyke KJet al., 2016,

    Electrical Oscillations in Wind Farm Systems: Analysis and Insight Based on Detailed Modeling

    , IEEE TRANSACTIONS ON SUSTAINABLE ENERGY, Vol: 7, Pages: 51-62, ISSN: 1949-3029
  • Journal article
    Lee ATL, Chen H, Tan SC, Hui SYet al., 2016,

    Precise Dimming and Color Control of LED Systems Based on Color Mixing

    , IEEE Transactions on Power Electronics, Vol: 31, Pages: 65-80, ISSN: 1941-0107

    This paper proposes a closed-loop nonlinear scheme for precisely controlling the luminosity and correlated color temperature (CCT) of a bicolor adjustable light-emitting diode (LED) lamp. The main objective is to achieve a precise and fully independent dimming and CCT control of the light mixture emitted from a two-string LED lamp comprising warm-white and cool-white color LEDs, regardless of the operating conditions and throughout the long operating lifetime of the LED lamp. The proposed control method is formulated using the nonlinear empirical LED model of the bicolor white LED system. Experimental results show that with the proposed closed-loop nonlinear approach, both CCT and dimming control of the bicolor lamp is significantly more accurate and robust to ambient temperature variations, ambient light interference, and LED aging than the conventional linear approach used in existing products. The maximum error in luminous flux employing the proposed closed-loop nonlinear approach is 3%, compared with 20% using the closed-loop linear approach. The maximum deviation in CCT is only 1.78%, compared with 27.5% with its linear counterpart.
  • Conference paper
    Teng F, Strbac G, 2016,

    Commercial strategy for operating energy storage in supporting integration of renewable generation

    , 8th IEEE International Power Electronics and Motion Control Conference (IPEMC-ECCE Asia), Publisher: IEEE, Pages: 519-523
  • Conference paper
    Bloemink JM, Green TC, 2016,

    Required VSC Efficiency for Zero Net-Loss Distribution Network Active Compensation

    , 7th IEEE International Symposium On Power Electronics for Distributed Generation Systems (PEDG), Publisher: IEEE, ISSN: 2329-5759
  • Conference paper
    Li P, Fedele G, Pin G, Parisini Tet al., 2016,

    Kernel-based Deadbeat Parametric Estimation of Bias-affected Damped Sinusoidal Signals

    , European Control Conference (ECC), Publisher: IEEE, Pages: 519-524
  • Conference paper
    Ascencio P, Astolfi A, Parisini T, 2016,

    An Adaptive Observer for a class of Parabolic PDEs based on a Convex Optimization Approach for Backstepping PDE Design

    , American Control Conference (ACC), Publisher: IEEE, Pages: 3429-3434, ISSN: 0743-1619
  • Conference paper
    Sassano M, Astolfi A, 2016,

    Approximate Dynamic Tracking and Feedback Linearization

    , 55th IEEE Conference on Decision and Control (CDC), Publisher: IEEE, Pages: 5688-5693, ISSN: 0743-1546
  • Conference paper
    Yates DC, Aldhaher S, Mitcheson PD, 2016,

    Design of 3 MHz DC/AC Inverter with Resonant Gate Drive for a 3.3 kW EV WPT System

    , 2nd IEEE Annual Southern Power Electronics Conference (SPEC), Publisher: IEEE
  • Conference paper
    Sanz IM, Chaudhuri B, Strbac G, 2016,

    Inertial Response From Offshore Wind Farms Connected Through DC Grids

    , IEEE-Power-and-Energy-Society General Meeting (PESGM), Publisher: IEEE, ISSN: 1944-9925
  • Conference paper
    Prieto-Araujo E, Junyent-Ferre A, Lavernia-Ferrer D, Gomis-Bellmunt Oet al., 2016,

    Decentralized Control of a Nine-Phase Permanent Magnet Generator for Offshore Wind Turbines

    , IEEE-Power-and-Energy-Society General Meeting (PESGM), Publisher: IEEE, ISSN: 1944-9925
  • Conference paper
    Ye Y, Papadaskalopoulos D, Strbac G, 2016,

    Factoring Flexible Demand Non-Convexities in Electricity Markets

    , IEEE-Power-and-Energy-Society General Meeting (PESGM), Publisher: IEEE, ISSN: 1944-9925
  • Conference paper
    Papadaskalopoulos D, Strbac G, 2016,

    Nonlinear and Randomized Pricing for Distributed Management of Flexible Loads

    , IEEE-Power-and-Energy-Society General Meeting (PESGM), Publisher: IEEE, ISSN: 1944-9925
  • Conference paper
    Teng F, Trovato V, Strbac G, 2016,

    Stochastic Scheduling with Inertia-dependent Fast Frequency Response Requirements

    , IEEE-Power-and-Energy-Society General Meeting (PESGM), Publisher: IEEE, ISSN: 1944-9925
  • Conference paper
    Chen Y, Teng F, Moreno R, Strbac Get al., 2016,

    Impact of Dynamic Line Rating with Forecast Error on the Scheduling of Reserve Service

    , IEEE-Power-and-Energy-Society General Meeting (PESGM), Publisher: IEEE, ISSN: 1944-9925
  • Conference paper
    Huang Y, Xiong S, Tan S-C, Hui S-YRet al., 2016,

    Compact Modular Switched-Capacitor DC/DC Converters with Exponential Voltage Gain

    , 31st Annual IEEE Applied Power Electronics Specialists Conference and Exposition (APEC), Publisher: IEEE, Pages: 1894-1899, ISSN: 1048-2334
  • Conference paper
    Ho GKY, Pong BMH, Hui RSY, 2016,

    LLC Resonant Converter Design for Bendable Power Converter

    , 31st Annual IEEE Applied Power Electronics Specialists Conference and Exposition (APEC), Publisher: IEEE, Pages: 2328-2333, ISSN: 1048-2334
  • Conference paper
    Xiong S, Huang Y, Tan S-C, Hui S-YRet al., 2016,

    Morphing Switched-Capacitor Step-Down DC-DC Converters with Variable Conversion Ratio

    , 31st Annual IEEE Applied Power Electronics Specialists Conference and Exposition (APEC), Publisher: IEEE, Pages: 1888-1893, ISSN: 1048-2334
  • Conference paper
    Karimi H, Papadaskalopoulos D, Strbac G, 2016,

    Integrating Customers' Differentiated Supply Valuation in Distribution Network Planning and Charging

    , 13th International Conference on the European Energy Market (EEM), Publisher: IEEE, ISSN: 2165-4077
  • Conference paper
    Fan Y, Papadaskalopoulos D, Strbac G, 2016,

    A Game Theoretic Modeling Framework for Decentralized Transmission Planning

    , 19th Power Systems Computation Conference (PSCC), Publisher: IEEE
  • Conference paper
    Zhang C, Tang N, Zhong W, Lee CK, Hui RSYet al., 2016,

    A New Energy Harvesting and Wireless Power Transfer System for Smart Grid

    , 7th IEEE International Symposium On Power Electronics for Distributed Generation Systems (PEDG), Publisher: IEEE, ISSN: 2329-5759
  • Conference paper
    Lee CK, Liu H, Zhang G, Yan S, Waffenschmidt E, Hui RSYet al., 2016,

    A Unified Converter Topology for Electric Spring

    , 7th IEEE International Symposium On Power Electronics for Distributed Generation Systems (PEDG), Publisher: IEEE, ISSN: 2329-5759
  • Conference paper
    Liu H, Lee CK, Hui RSY, Waffenschmidt Eet al., 2016,

    Capability Analysis and Design Considerations of Electric Springs

    , 7th IEEE International Symposium On Power Electronics for Distributed Generation Systems (PEDG), Publisher: IEEE, ISSN: 2329-5759
  • Conference paper
    Chen B, Parisini T, Polycarpou MM, 2016,

    A Deadbeat Estimator-Based Fault Isolation Scheme for Nonlinear Systems

    , European Control Conference (ECC), Publisher: IEEE, Pages: 734-739

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