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  • JOURNAL ARTICLE
    Xenos DP, Kopanos GM, Cicciotti M, Thornhill NFet al., 2016,

    Operational optimization of networks of compressors considering condition-based maintenance

    , COMPUTERS & CHEMICAL ENGINEERING, Vol: 84, Pages: 117-131, ISSN: 0098-1354
  • JOURNAL ARTICLE
    Xenos DP, Lunde E, Thornhill NF, 2016,

    Optimal Operation and Maintenance of Gas Compressor Stations: An Integrated Framework Applied to a Large-Scale Industrial Case

    , JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME, Vol: 138, ISSN: 0742-4795
  • CONFERENCE PAPER
    Akinmolayan F, Thornhill N, Sorensen E, 2015,

    A Detailed Mathematical Modelling Representation of Clean Water Treatment Plants

    , 12th International Symposium on Process Systems Engineering (PSE) / 25th European Symposium on Computer Aided Process Engineering (ESCAPE), Publisher: ELSEVIER SCIENCE BV, Pages: 2537-2542, ISSN: 1570-7946
  • JOURNAL ARTICLE
    Barocio E, Pal BC, Thornhill NF, Roman Messina Aet al., 2015,

    A Dynamic Mode Decomposition Framework for Global Power System Oscillation Analysis

    , IEEE TRANSACTIONS ON POWER SYSTEMS, Vol: 30, Pages: 2902-2912, ISSN: 0885-8950
  • CONFERENCE PAPER
    Budinis S, Thornhill NF, 2015,

    Supercritical gas recycle analysis for surge control of centrifugal compressors

    , 12th International Symposium on Process Systems Engineering (PSE) / 25th European Symposium on Computer Aided Process Engineering (ESCAPE), Publisher: ELSEVIER SCIENCE BV, Pages: 1583-1588, ISSN: 1570-7946
  • JOURNAL ARTICLE
    Cecilio IM, Ottewill JR, Fretheim H, Thornhill NFet al., 2015,

    Multivariate Detection of Transient Disturbances for Uni- and Multirate Systems

    , IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY, Vol: 23, Pages: 1477-1493, ISSN: 1063-6536
  • JOURNAL ARTICLE
    Kopanos GM, Xenos DP, Cicciotti M, Pistikopoulos EN, Thornhill NFet al., 2015,

    Optimization of a network of compressors in parallel: Operational and maintenance planning - The air separation plant case

    , APPLIED ENERGY, Vol: 146, Pages: 453-470, ISSN: 0306-2619
  • CONFERENCE PAPER
    Mehleri ED, Mac Dowell N, Thornhill NF, 2015,

    Model Predictive Control of Post-Combustion CO2 Capture Process integrated with a power plant

    , 12th International Symposium on Process Systems Engineering (PSE) / 25th European Symposium on Computer Aided Process Engineering (ESCAPE), Publisher: ELSEVIER SCIENCE BV, Pages: 161-166, ISSN: 1570-7946
  • CONFERENCE PAPER
    Romero DD, Graven T-G, Thornhill NF, 2015,

    Linking process, electrical and logical connectivity for supported fault diagnosis

    , 12th International Symposium on Process Systems Engineering (PSE) / 25th European Symposium on Computer Aided Process Engineering (ESCAPE), Publisher: ELSEVIER SCIENCE BV, Pages: 965-970, ISSN: 1570-7946
  • JOURNAL ARTICLE
    Xenos DP, Cicciotti M, Kopanos GM, Bouaswaig AEF, Kahrs O, Martinez-Botas R, Thornhill NFet al., 2015,

    Optimization of a network of compressors in parallel: Real Time Optimization (RTO) of compressors in chemical plants - An industrial case study

    , APPLIED ENERGY, Vol: 144, Pages: 51-63, ISSN: 0306-2619
  • CONFERENCE PAPER
    Yang Y, Velayudhan A, Thornhill NF, Farid SSet al., 2015,

    Manufacturability Indices for High-Concentration Monoclonal Antibody Formulations

    , 12th International Symposium on Process Systems Engineering (PSE) / 25th European Symposium on Computer Aided Process Engineering (ESCAPE), Publisher: ELSEVIER SCIENCE BV, Pages: 2147-2152, ISSN: 1570-7946
  • CONFERENCE PAPER
    Zhang Y, Larsson M, Pal B, Thornhill NFet al., 2015,

    Simulation approach to reliability analysis of WAMPAC system

    , 2015 IEEE PES Innovative Smart Grid Technologies Conference (ISGT), Publisher: IEEE, Pages: 1-5

    Wide are monitoring, protection and control (WAMPAC) plays a critical role in smart grid development. Since WAMPAC frequently has the tasks of executing control and protection actions necessary for secure operation of power systems, its reliability is essential. This paper proposes a novel approach to the reliability analysis of WAMPAC systems. WAMPAC system functions are first divided into four subsystems: the measured inputs, the communication, the actuator and the analytic execution subsystems. The reliability indices of the subsystems are computed then using Monte Carlo approach. A sensitivity analysis is also described to illustrate the influence of different components on the system reliability.

  • CONFERENCE PAPER
    Arroyo E, Schulze D, Christiansen L, Fay A, Thornhill NFet al., 2014,

    Derivation of Diagnostic Models Based on Formalized Process Knowledge

    , 19th World Congress of the International-Federation-of-Automatic-Control (IFAC), Publisher: ELSEVIER SCIENCE BV, Pages: 3456-3464, ISSN: 2405-8963
  • CONFERENCE PAPER
    Budinis S, Thornhill NF, 2014,

    An integrated control technique for compressor operation

    , United-Kingdom-Automatic-Control-Council (UKACC) 10th International Conference on Control (CONTROL), Publisher: IEEE, Pages: 444-449
  • JOURNAL ARTICLE
    Cecilio IM, Ottewill JR, Pretlove J, Thornhill NFet al., 2014,

    Nearest neighbors method for detecting transient disturbances in process and electromechanical systems

    , JOURNAL OF PROCESS CONTROL, Vol: 24, Pages: 1382-1393, ISSN: 0959-1524
  • CONFERENCE PAPER
    Cicciotti M, Bouaswaiga AEF, Martinez-Botas RF, Xenos DP, Thornhill NF, Manenti Fet al., 2014,

    Simultaneous Nonlinear Reconciliation and Update of Parameters for Online Use of First-Principles Models: An Industrial Case-Study on Compressors

    , 24th European Conference on Computer Aided Process Engineering (ESCAPE 24), Pages: 457-462, ISSN: 1570-7946

    Online uses of first-principles models include nonlinear model predictive control, softsensors, real-time optimization, and real-time process monitoring, among others. The industrial implementation of these applications needs accurate adaptive models and reconciled data. The simultaneous reconciliation and update of parameters of a first- principles model can be achieved using an optimization framework that exploits physical and analytical redundancy of information. This paper demonstrates this concept by means of an industrial case-study. The case-study is a multi-stage centrifugal compressor for which a first-principles model was recently developed. The update of the model parameters is necessary to capture slowly progressing mechanical degradation (e.g. due to fouling and erosion). The reconciliation of the data is necessary for reducing downtime of the online model-based applications caused by gross errors. Two industrial cases including sensor failures were analysed. Applying the proposed framework, it was possible to reconcile the measurements for both cases. © 2014 Elsevier B.V.

  • CONFERENCE PAPER
    Cicciotti M, Xenos DP, Bouaswaig AEF, Thornhill NF, Martinez-Botas RFet al., 2014,

    ONLINE PERFORMANCE MONITORING OF INDUSTRIAL COMPRESSORS USING MEANLINE MODELLING

    , ASME Turbo Expo: Turbine Technical Conference and Exposition, Publisher: AMER SOC MECHANICAL ENGINEERS
  • CONFERENCE PAPER
    Ersdal AM, Fabozzi D, Imsland L, Thornhill NFet al., 2014,

    Model Predictive Control for Power System Frequency Control Taking into Account Imbalance Uncertainty

    , 19th World Congress of the International-Federation-of-Automatic-Control (IFAC), Publisher: ELSEVIER SCIENCE BV, Pages: 981-986, ISSN: 2405-8963
  • CONFERENCE PAPER
    Ikram W, Jansson N, Harvei T, Aakvaag N, Halvorsen I, Petersen S, Carlsen S, Thornhill NFet al., 2014,

    Wireless Communication in Process Control Loop: Requirements Analysis, Industry Practices and Experimental Evaluation

    , 19th IEEE International Conference on Emerging Technology and Factory Automation (ETFA), Publisher: IEEE
  • JOURNAL ARTICLE
    Ikram W, Petersen S, Orten P, Thornhill NFet al., 2014,

    Adaptive Multi-Channel Transmission Power Control for Industrial Wireless Instrumentation

    , IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS (open access article), Vol: 10, Pages: 978-990, ISSN: 1551-3203

    The adoption of wireless technology for industrial wireless instrumentation requires high-quality communication performance. The use of transmission power control (TPC) can help address industrial issues concerning energy consumption, interference,and fading. This paper presents a TPC algorithm designed for industrial applications based on theoretical and empirical studies. It is shown that the proposed algorithm adapts to variations in link quality, and is hardware-independent and practical.

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