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Phase-Controlled Thyristor Sub-Synchronous Damper Converter for a Liquefied Natural Gas Plant

Author

Listed:
  • Lorenzo Bongini

    (Department of Information Engineering (DINFO), University of Florence, 50139 Florence, Italy)

  • Rosa Anna Mastromauro

    (Department of Information Engineering (DINFO), University of Florence, 50139 Florence, Italy)

  • Daniele Sgrò

    (Baker Hughes, 50127 Florence, Italy)

  • Fabrizio Malvaldi

    (Baker Hughes, 50127 Florence, Italy)

Abstract

In electrified liquefied natural gas (LNG) plants variable frequency drives (VFDs) interact with turbine-generator (TG) units creating torsional vibrations known as sub-synchronous torsional interactions (SSTIs). Torsional vibrations can be dangerous for an LNG plant when they involve torsional instability. The stability of an LNG plant depends on the plant configuration and on the number of TG units and of VFDs. In such peculiar configurations stability cannot be achieved acting of the VFDs control system. Alternatively, dedicated equipment is needed to damp the torsional vibrations. In this paper, a sub-synchronous damper (SSD) converter is used to mitigate the SSTI phenomena. The SSD converter consists of a thyristor H-bridge regulating the phase of the additional torque provided at the TG unit air-gap. A phase control system is proposed and is based on the torsional torque oscillations measurement. An adaptive reference signal is employed, also guaranteeing high performance in island-mode operation. The proposed solution increases the damping of the LNG plant in all the considered configurations. The LNG plant successful operation is validated by comprehensive results.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:17:p:5238-:d:620849
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    References listed on IDEAS

    as
    1. Penghan Li & Jie Wang & Linyun Xiong & Fei Wu, 2017. "Nonlinear Controllers Based on Exact Feedback Linearization for Series-Compensated DFIG-Based Wind Parks to Mitigate Sub-Synchronous Control Interaction," Energies, MDPI, vol. 10(8), pages 1-16, August.
    2. 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.
    3. Minh-Quan Tran & Minh-Chau Dinh & Seok-Ju Lee & Jea-In Lee & Minwon Park & Chur Hee Lee & JongSu Yoon, 2019. "Analysis and Mitigation of Subsynchronous Resonance in a Korean Power Network with the First TCSC Installation," Energies, MDPI, vol. 12(15), pages 1-16, July.
    4. Shen Wang & Zheng Xu, 2015. "Research on Shaft Subsynchronous Oscillation Characteristics of Parallel Generators and SSDC Application in Mitigating SSO of Multi-Generators," Energies, MDPI, vol. 8(3), pages 1-19, February.
    5. Jiyoung Song & Seungchan Oh & Jaegul Lee & Jeonghoon Shin & Gilsoo Jang, 2020. "Application of the First Replica Controller in Korean Power Systems," Energies, MDPI, vol. 13(13), pages 1-13, June.
    6. 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.
    7. Benfeng Gao & Ruixue Zhang & Ren Li & Hongyang Yu & Guoliang Zhao, 2017. "Subsynchronous Torsional Interaction of Wind Farms with FSIG Wind Turbines Connected to LCC-HVDC Lines," Energies, MDPI, vol. 10(9), pages 1-18, September.
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