Analysis of Subsynchronous Torsional Interaction of HVDC System Integrated Hydro Units With Small Generator-to-Turbine Inertia Ratios

Choo, Yin Chin; Agalgaonkar, Ashish P.; Muttaqi, Kashem M.; Perera, Sarath; Negnevitsky, Michael

doi:10.1109/tpwrs.2013.2292857

Cited by 16 publications

(10 citation statements)

References 19 publications

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Section: Sub-synchronous Torsional Interaction Phenomenamentioning

confidence: 99%

“…The loop resulting from the described phenomena can be stable when the torsional vibrations on the TG unit naturally damp following the transient event. The loop can be unstable when such vibrations keep increasing over time with insufficient or negative damping [9,11]. The overall damping of each TG unit supplying an island-operated grid is the sum of the shaftline inherent mechanical damping plus the electrical damping resulting from the above-mentioned electro-mechanical loop [24].…”

Section: Sub-synchronous Torsional Interaction Phenomenamentioning

confidence: 99%

“…Limited literature has been published about SSTI phenomena in LNG plants [5][6][7][8]. Differently, numerous studies can be found on SSTI for High Voltage Direct Current (HVDC) applications [9][10][11][12][13]. In this context, SSTI is categorized as the evolution of the Sub-Synchronous Resonance (SSR) phenomenon [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Electrical Damping Assessment and Stability Considerations for a Highly Electrified Liquefied Natural Gas Plant

Bongini

Mastromauro

Sgro³

et al. 2020

Energies

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In recent years, the Oil & Gas industry has been subjected to a progressive electrification process aiming to comply with global environmental requirements on CO2 emissions reduction. High-power electric motors fed by Variable Frequency Drives (VFDs) have replaced gas turbines as drivers for gas compression applications. In Liquefied Natural Gas (LNG) plants, unexpected downturns could be experienced in case of high torsional vibrations of power generations units. These torsional vibrations derive from the interaction among turbine-generator (TG) units and VFDs and are known as Sub-Synchronous Torsional Interactions (SSTIs). SSTIs can lead to instability when the overall electromechanical system lacks sufficient damping. In this scenario, electrical damping assessment is fundamental in order to ensure stability and reliable operation of an LNG plant. Negative electrical damping is strictly related to the negative incremental resistance behavior of the power converters and it is influenced by the converter’s control system. In this paper, a real case study based on Thyristor Variable Frequency Drives (TVFDs) is considered. Ad hoc dynamic models of the power converters and of the TG unit are developed and combined in order to provide an accurate estimation of the electrical damping. It is demonstrated that the electrical damping is affected by variations of the main control system parameters and how the use of a simplified model instead of an ad hoc model can impact the stability evaluation.

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Section: Sub-synchronous Torsional Interaction Phenomenamentioning

confidence: 99%

Section: Sub-synchronous Torsional Interaction Phenomenamentioning

confidence: 99%

See 1 more Smart Citation

Electrical Damping Assessment and Stability Considerations for a Highly Electrified Liquefied Natural Gas Plant

Bongini

Mastromauro

Sgro³

et al. 2020

Energies

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show abstract

“…A closed-loop interconnected linearised model shown in Fig. 1b can be established for examining the dynamic interactions between the torsional dynamics of the SG and the HVDC [2][3][4][5][6][7]. In Fig.…”

Section: (I)mentioning

confidence: 99%

“…Such SSOs were found for the first time in the field test at Square Butte, North Dakota, USA in 1977 [1]. Afterwards, great effort has been made by many power engineers and researchers to investigate why the torsional SSOs may be caused by the HVDC line [1][2][3][4][5]. In the investigation, a closed-loop interconnected model of the power system was used.…”

Section: Introductionmentioning

confidence: 99%

Sub‐synchronous oscillations caused by the control of LCC HVDC transmission line under the condition of open‐loop modal coupling

Wei

Zhen

Wang

2018

IET Generation, Transmission & Distribution

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A Practical Framework for Investigating the SSTI between HVDC and Nearby Generators

Shin

Song

et al. 2023

J. Electr. Eng. Technol.

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Analysis of Subsynchronous Torsional Interaction of HVDC System Integrated Hydro Units With Small Generator-to-Turbine Inertia Ratios

Cited by 16 publications

References 19 publications

Electrical Damping Assessment and Stability Considerations for a Highly Electrified Liquefied Natural Gas Plant

Electrical Damping Assessment and Stability Considerations for a Highly Electrified Liquefied Natural Gas Plant

Sub‐synchronous oscillations caused by the control of LCC HVDC transmission line under the condition of open‐loop modal coupling

A Practical Framework for Investigating the SSTI between HVDC and Nearby Generators

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