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  • Conference paper
    Thornhill NF, Fabozzi D, Pal BC, 2013,

    Monitoring and management of power transmission dynamics in an industrial smart grid

    , IEEE PES PowerTech Grenoble 2013

    This article is a position paper whose purpose is to give the context for presentations in a special session at PowerTech 2013. The special session is being proposed by the EU FP7 Real-Smart Consortium, a Marie Curie Industry-Academic Pathways and Partnerships project. The paper gives an overview of topics on modeling, monitoring and management of power transmission dynamics with participation from large industrial loads. © 2013 IEEE.

  • Conference paper
    Ikram W, Thornhill NF, 2013,

    Towards the development of a wireless network node lifetime calculation tool

    , IEEE International Conference on Emerging Technologies and Factory Automation, ETFA 2013, ISSN: 1946-0740

    The designers, optimizers and maintenance personnel of a wireless sensor network are frequently challenged by system level energy budget considerations. Minimizing the need for battery replacement is often the design goal while ensuring that a balance is maintained between capability and current consumption in order to address application needs. In this paper, a tool is introduced which can be used to calculate the lifetime of a battery operated wireless node. It allows the user to configure different wireless sensor platforms, select a battery of choice, and specify the application which needs to be executed over the configured hardware. As a result, the tool computes an estimate for the expected lifetime of the wireless sensor node. Furthermore, the tool also provides a detailed overview of the energy consumed by each component during a duty cycle. © 2013 IEEE.

  • Conference paper
    Barocio E, Pal BC, Fabozzi D, Thornhill NFet al., 2013,

    Detection and visualization of power system disturbances using principal component analysis

    , IREP Symposium: Bulk Power System Dynamics and Control - IX Optimization, Security and Control of the Emerging Power Grid, IREP 2013

    In this paper, a multivariate statistical projection method based on Principal Component Analysis (PCA) is proposed for detecting and extracting unusual or anomalous events from wide-area monitoring data. The method combines PCA with statistical test to detect and analyze anomalous dynamic events from measured data. Simulations based on a transient stability model of the New England Test System are used to demonstrate the ability of the method to detect and extract system events from wide-area data. © 2013 IEEE.

  • Conference paper
    Ersdal AM, Imsland L, Cecilio IM, Fabozzi D, Thornhill NFet al., 2013,

    Applying model predictive control to power system frequency control

    , 4th IEEE/PES Innovative Smart Grid Technologies Europe (ISGT EUROPE)

    Model predictive control (MPC) is investigated as a control method which may offer advantages in frequency control of power systems than the control methods applied today, especially in presence of increased renewable energy penetration. The MPC includes constraints on both generation amount and generation rate of change, and it is tested on a one-area system. The proposed MPC is tested against a conventional proportional-integral (PI) controller, and simulations show that the MPC improves frequency deviation and control performance. © 2013 IEEE.

  • Journal article
    Shukla V, Naim MM, Thornhill NF, 2012,

    Rogue seasonality detection in supply chains

    , INTERNATIONAL JOURNAL OF PRODUCTION ECONOMICS, Vol: 138, Pages: 254-272, ISSN: 0925-5273
  • Conference paper
    Cecílio IM, Rapp K, Thornhill NF, 2012,

    Process Performance Analysis in Large-Scale Systems Integrating Different Sources of Information

    , 8th IFAC International Symposium on Advanced Control of Chemical Processes, 2012, Publisher: International Federation of Automatic Control, Pages: 45-50
  • Journal article
    Meland E, Thornhill NF, Lunde E, Rasmussen Met al., 2012,

    Quantification of valve leakage rates

    , AICHE JOURNAL, Vol: 58, Pages: 1181-1193, ISSN: 0001-1541
  • Journal article
    Sharifzadeh M, Thornhill NF, 2012,

    Optimal selection of control structure using a steady-state inversely controlled process model

    , COMPUTERS & CHEMICAL ENGINEERING, Vol: 38, Pages: 126-138, ISSN: 0098-1354
  • Conference paper
    Cecilio IM, Chen SL, Thornhill NF, 2011,

    Importance of auxiliary systems for process fault detection and diagnosis

    , 19th Mediterranean Conference on Control & Automation (MED), Publisher: IEEE, Pages: 952-957
  • Conference paper
    Sharifzadeh M, Thornhill NF, 2011,

    Optimal controlled variable selection using a nonlinear simulation-optimization framework

    , 21st European Symposium on Computer Aided Process Engineering

    In feedback control, controlled variables are those process variables which are measuredand fed back to controllers. Then in the presence of disturbances, controllers by themeans of manipulating the inputs aim to maintain the controlled variables at theirsetpoints. The objectives for the selection of controlled variables can be conflicting andcompeting. These objectives include minimization of (1) economic losses, (2) inputmanipulations, (3) output variations and (4) changes in process states. This researchaims to present a systematic framework for optimal selection of controlled variables.Each of the above-mentioned objectives is defined within a multi-objective function. Inaddition, the reasoning behind the selection of nonlinear steady state model is explained.The proposed methodology is benchmarked on an industrial distillation train.Optimization programming is presented and the paper discusses how the size of theoptimization problem can be reduced by means of engineering insights and addressingthe concerns regarding feasibility of the developed control structure. The methodologyis scalable to large industrial problems, while maintaining its rigour. The results confirmthat a very good trade-off is established between different objectives.

  • Journal article
    Thambirajah J, Thornhill NF, Pal BC, 2011,

    A Multi­variate Approach Towards Inter-Area Oscillation Damping Estimation Under Ambient Conditions Via Independent Component Analysis And Random Decrement

    , IEEE Transactions on Power Systems, Vol: 26, Pages: 315-322, ISSN: 0885-8950

    This paper presents a novel approach to the monitoring of interarea oscillation frequency and damping using multivariate analysis techniques. A two-step method is presented 1) independent component analysis for the detection of interarea modes and estimation of their frequencies and 2) random decrement for the estimation of mode damping. The method is applied to real measurements taken in Finland within the Nordic Power System to estimate the critical interarea mode frequency and damping in the system.

  • Conference paper
    Stonier A, Pain D, Westlake A, Hutchinson N, Thornhill NF, Farid SSet al., 2011,

    Integration of stochastic simulation with advanced multivariate and visualisation analyses for rapid prediction of facility fit issues in biopharmaceutical processes

    , 21st European Symposium on Computer Aided Process Engineering (ESCAPE-21), Publisher: ELSEVIER SCIENCE BV, Pages: 1356-1360, ISSN: 1570-7946
  • Conference paper
    Di Geronimo Gil GJ, Alabi DB, Iyun OE, Thornhill NFet al., 2011,

    Merging process models and plant topology

    , International Symposium on Advanced Control of Industrial Processes, ADCONIP 2011, Pages: 15-21

    The paper discusses the merging of first principles process models with plant topology derived in an automated way from a process drawing. The resulting structural models should make it easier for a range of methods from the literature to be applied to industrial-scale problems in process operation and design. © 2011 Zhejiang University.

  • Report
    Craig I, Aldrich C, Braatz R, Cuzzola F, Domlan E, Engell S, Hahn J, Havlena V, Horch A, Huang B, Khanbaghi M, Konstantellos A, Marquardt W, McAvoy T, Parisini T, Pistikopoulos E, Samad T, Skogestad S, Thornhill N, Yu Jet al., 2011,

    Control in the process industries

    , Control in the process industries, in The Impact of Control Technology, Overview, Success Stories, and Research Challenges, T. Samad and A. Annaswamy (Eds), Publisher: IEEE
  • Journal article
    Jukka T, Thambirajah J, Larsson M, Pal BC, Thornhill NF, Haarla LC, Hung W, Carter A, Rauhala Tet al., 2011,

    Comparison of Three Electromechanical Oscillation Damping Estimation Methods

    , IEEE Transactions on Power Systems, Vol: 26, Pages: 2398-2407, ISSN: 0885-8950

    This paper describes three data driven methods to monitor electromechanical oscillations in interconnected power system operation. The objective is to compare and contrast the performance of the methods. The accuracy of damping ratio and frequency of oscillations are the measures of the performance of the algorithms. The advantages and disadvantages of various techniques and their limitations to measurement noise have been considered while assessing performance. The target frequency and damping are computed using the Nordic power system simulation model.

  • Journal article
    Sharifzadeh M, Rashtchian D, Pishvaie M, Thornhill NFet al., 2010,

    Energy Induced Separation Network Synthesis of an Olefin Compression Section: A Case Study

    , Industrial & Engineering Chemistry Research, Vol: 50, Pages: 1610-1623

    When latent heat is transferred in a heat exchanger network, the formation of the second phase creates an opportunity for separation. This network is known as a Heat Induced Separation Network (HISEN). HISENs have been extended to include pressure adjusting devices for improving the thermodynamic feasibility of the network. This extended network is termed an Energy Induced Separation Network (EISEN). Most examples of EISENs in the literature are environmental pollution treatment case studies which do not require liquid phase mass integration or shaft power integration. They assume a predetermined extent of separation and mostly are based on conceptual methods of design. This paper explains how the optimization framework must be developed in order to systematically address the general characteristics of EISENs. The framework is illustrated using a case study of the synthesis problem of an olefin compression section.

  • Conference paper
    Ikram W, Thornhill NF, 2010,

    Wireless communication in process automation: A survey of opportunities, requirements, concerns and challenges

    , Pages: 471-476

    The advancements in wireless networking technology, specifically in the short-range wireless networking technology, offer an enormous opportunity for wireless connectivity of field devices both in oil and gas and other chemical processing plants. The prerequisite of a field network includes real-time support for mixed traffic, availability, security, reliability and scalability in a harsh industrial environment. These conditions have to be fulfilled by any wireless network in order to operate. This paper presents a brief overview of the requirements for wireless in process automation, relative standings of existing short-range wireless network technologies based on the outlined criteria, and associated shortcomings. Furthermore, an examination of emerging industrial wireless standards which are designed to address the unique and stringent requirements of the process industry, is presented.

  • Journal article
    Thambirajah J, Barocio E, Thornhill NF, 2010,

    Comparative review of methods for stability monitoring in electrical power systems and vibrating structures

    , IET GENERATION TRANSMISSION & DISTRIBUTION, Vol: 4, Pages: 1086-1103, ISSN: 1751-8687
  • Conference paper
    Ikram W, Stoianov I, Thornhill NF, 2010,

    Towards a Radio-Controlled Time Synchronized Wireless Sensor Network

    , IEEE Emerging Technologies and Factory Automation (ETFA 2010), ISSN: 1946-0740

    Wireless sensor networks are deployed to monitor real-world phenomena, and are seeing growing demand in commerce and industry. These networks can benefit from time synchronized clocks on distributed nodes. The precision of time synchronization depends on error elimination or reliable estimation of errors associated with synchronization message delays. This paper examines an approach to time synchronize motes using onboard radio-controlled clocks. The advantage will be the minimisation of non-deterministic sources of errors in time synchronization amongst receivers. This approach of synchronization using out-of-band and dedicated time source is aimed to achieve network-wide, scalable, topology-independent, fast-convergent and less application-dependent solutions.

  • Journal article
    Apelt TA, Thornhill NF, 2009,

    Inferential measurement of SAG mill parameters V: MPC simulation

    , MINERALS ENGINEERING, Vol: 22, Pages: 1045-1052, ISSN: 0892-6875

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