Tom Nestli
Dr. ing.
Unitech Power Systems · Power Systems Engineering

Topics (10) View all

Publications (4) View all

  • Conference Proceeding: All-Electric LNG Liquefaction Plants: Technical Challenges and Possible Concept Solutions
    A. Sannino, L. Liljestrand, B. Rothman, T. Nestli, M. Kjall-Ohlsson, P.-E. Holsten
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    ABSTRACT: This paper discusses technical challenges posed by large all-electric liquefaction plants, in which the plant refrigeration compressors are driven by electric motors powered by gas-turbine driven electric power generators. The focus is on the interaction between large compressor drives and the electrical system. One issue is interharmonics in the subharmonic range from line-commutated inverter drives, which can cause subsynchronous resonance problems. Furthermore, a few alternatives for improving robustness of grid-connected liquefaction plants against voltage dips are presented.
    Industry Applications Conference, 2007. 42nd IAS Annual Meeting. Conference Record of the 2007 IEEE; 10/2007
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    Conference Proceeding: Offshore platform powered with new electrical motor drive system
    J.O. Lamell, T. Trumbo, T.F. Nestli
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    ABSTRACT: A new type of compressor motor drive and electrical transmission system will be installed on a Norwegian offshore platform in the North Sea. New compressors are required to compensate the declining reservoir pressure and boost the gas capacity through the pipelines to mainland. The variable speed drive systems consist of two 56 kilovolts, 40 MW synchronous cable wound motors and two directly connected high voltage direct current transmission lines, which are powered from mainland. The electrical drive system increases and secures the gas production at a higher efficiency than conventional gas turbine driven compressor systems and avoid emissions of environmentally harmful substances from the platform. The equipment in the electrical drive systems was under test during 2003 and was delivered for assembly on the mainland, after which it was shipped out to the platform. The drive systems are scheduled for installation in 2004 and commissioning in 2005. The application of a variable speed drive on a platform powered from mainland and utilization of a new combination of electrical cable wound motor and high voltage source converter, have required accurate analysis and design and thorough testing of the motor.
    Petroleum and Chemical Industry Conference, 2005. Industry Applications Society 52nd Annual; 10/2005
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    Conference Proceeding: Evaluation and comparison of predictor models for rotor flux calculation in induction motors
    T. Fagernes Nestli, R. Nilsen
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    ABSTRACT: A thorough method for evaluation and comparison of predictor models (models and observers) for rotor flux calculation is presented. A number of predictor models are investigated using the established procedure. The lowest overall sensitivity to parameter deviations and measurement errors is found in predictor models with voltage model and current model behaviour in the higher and lower frequency ranges, respectively
    Power Electronics Specialists Conference, PESC '94 Record., 25th Annual IEEE; 07/1994
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    Article: Nueva tecnología de suministro eléctrico para la plataforma Troll
    Tom F. Nestli, Lars Stendius, Magnus J. Johansson, Arne Abrahamsson, Philip C. Kjaer
    Revista ABB, ISSN 1013-3135, Nº 2, 2003, pags. 15-19.
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