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Electrical Damping Assessment and Sensitivity Analysis of a Liquefied Natural Gas Plant: Experimental Validation

Author

Listed:
  • Lorenzo Bongini

    (Department of Information Engineering (DINFO), University of Florence, 500139 Florence, Italy)

  • Rosa Anna Mastromauro

    (Department of Information Engineering (DINFO), University of Florence, 500139 Florence, Italy)

  • Daniele Sgrò

    (Baker Hughes, 50127 Florence, Italy)

  • Fabrizio Malvaldi

    (Baker Hughes, 50127 Florence, Italy)

Abstract

Liquefied Natural Gas (LNG) plants are commonly island-operated weak grids where the interaction of high-power Variable Frequency Drives (VFDs) with the Turbine-Generator (TG) units might cause Sub-Synchronous Torsional Interaction (SSTI) phenomena. SSTI phenomena can lead the LNG plant to instability conditions. Each LNG plant configuration is characterized by a risk level, which is considered high when the electrical damping at the TG Torsional Natural Frequencies (TNFs) is negative. Starting from a real case study, a detailed electromechanical model of an LNG plant is presented. The model is comprehensive of the control system of the power conversion stage and of the TG unit. Sensitivity analysis, performed on control system parameters, allows one to detect the parameters that impact the electrical damping and the stability of the overall LNG plant. A complete simulation platform is developed. Experimental results are carried out on a real LNG plant considering four different configurations. The theoretical model and the simulation platform allow one to estimate the electrical damping and the results are confirmed by the experimental validation. It is demonstrated that fine tuning of the power conversion stage control parameters can reduce the risk related to torsional instability.

Suggested Citation

  • Lorenzo Bongini & Rosa Anna Mastromauro & Daniele Sgrò & Fabrizio Malvaldi, 2020. "Electrical Damping Assessment and Sensitivity Analysis of a Liquefied Natural Gas Plant: Experimental Validation," Energies, MDPI, vol. 13(16), pages 1-27, August.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:16:p:4084-:d:395617
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    References listed on IDEAS

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    1. Lorenzo Bongini & Rosa Anna Mastromauro & Daniele Sgrò & Fabrizio Malvaldi, 2020. "Electrical Damping Assessment and Stability Considerations for a Highly Electrified Liquefied Natural Gas Plant," Energies, MDPI, vol. 13(10), pages 1-27, May.
    2. Vinay Sewdien & Xiongfei Wang & Jose Rueda Torres & Mart van der Meijden, 2020. "Critical Review of Mitigation Solutions for SSO in Modern Transmission Grids," Energies, MDPI, vol. 13(13), pages 1-20, July.
    3. Chengbing He & Dakang Sun & Lei Song & Li Ma, 2019. "Analysis of Subsynchronous Resonance Characteristics and Influence Factors in a Series Compensated Transmission System," Energies, MDPI, vol. 12(17), pages 1-13, August.
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    Cited by:

    1. Lorenzo Bongini & Rosa Anna Mastromauro & Daniele Sgrò & Fabrizio Malvaldi, 2021. "Phase-Controlled Thyristor Sub-Synchronous Damper Converter for a Liquefied Natural Gas Plant," Energies, MDPI, vol. 14(17), pages 1-17, August.

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