Small-Signal Stability Analysis of Photovoltaic-Hydro Integrated Systems on Ultra-Low Frequency Oscillation

Wang, Sijia; Wu, Xiangyu; Chen, Gang; Xu, Yin

doi:10.3390/en13041012

Cited by 14 publications

(3 citation statements)

References 16 publications

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“…It was recommended to reduce the number of hydropower units as soon as possible after ULFO. There are also studies on the generation of ULFO in hybrid systems of new energy and hydropower [13][14].…”

Section: Introductionmentioning

confidence: 99%

Analysis of ultra-low frequency oscillation mechanism of hydraulic turbine governor under different control modes

Li,

Feng,

Zheng

2024

J. Phys.: Conf. Ser.

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As the southwest power grid with a high proportion of hydropower was transformed into UHV AC-DC network structure, some ultra-low frequency oscillations have appeared in the power grid. In this paper, according to the characteristics of the hydropower unit governor, a small disturbance model was established, and the influence of various parameters of the hydropower unit governor on the system stability in primary frequency modulation was discussed by using the eigenvalue analysis method, and the power mode and the opening mode were compared. The results showed that the parameter adjustable range of the opening mode was larger than that of the power mode. This paper lays a foundation for further research on suppression methods of ultra-low frequency oscillations.

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Section: Introductionmentioning

confidence: 99%

Analysis of ultra-low frequency oscillation mechanism of hydraulic turbine governor under different control modes

Li,

Feng,

Zheng

2024

J. Phys.: Conf. Ser.

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“…The power conversion stage is taken into account through an average model where only the passive components of the circuits are considered, as in [13,25]. On the contrary, independent of the specific application, small-signal analysis allows us to achieve dynamic models of the power system for fair stability assessment in the case of weak grids [26,27]. In this paper, an ad-hoc state-space dynamic model of a combined electromechanical system is developed.…”

Section: Introductionmentioning

confidence: 99%

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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“…With the continuous occurrence of ULFO events, the mechanism, characteristics and control strategy of ULFO have become a research hotspot. In terms of mechanism and characteristics, the relevant research mainly analyzes the causes and main influencing factors from the aspects of eigenvalue analysis [14], parameter sensitivity [15,16] and damping torque coefficient [17,18]. In terms of control strategy, the research mainly focuses on the means of governor parameter optimization and adjustment [7,19,20], introduction of frequency limit control (FLC) of HVDC [21,22], and the means of optimizing PSS parameters or using governor additional control [23,24] to suppress ULFO, but it has not yet been applied.…”

Section: Introductionmentioning

confidence: 99%

Research on Damping Control Index of Ultra-Low-Frequency Oscillation in Hydro-Dominant Power Systems

Chen¹,

Liu²,

Fan³

et al. 2020

Sustainability

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In recent years, ultra-low-frequency oscillation (ULFO) is a prominent problem in power systems of dominant hydropower. In order to suppress ULFO, the most effective strategy is the governor parameters optimization to improve the system damping within the ultra-low-frequency band. However, no explicit standard has been established to stipulate the level of system damping for ULFO suppression. In this paper, the key factors that affect the amplitude and damping of ULFO are firstly analyzed. Then, the design principle of the damping control index of ULFO is put forward. According to it, a damping control index is proposed. After that, a case of ULFO in an actual power system proves the rationality of the proposed index. Finally, the application of the index in the Southwest China Power Grid illustrates its effectiveness and feasibility.

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Small-Signal Stability Analysis of Photovoltaic-Hydro Integrated Systems on Ultra-Low Frequency Oscillation

Cited by 14 publications

References 16 publications

Analysis of ultra-low frequency oscillation mechanism of hydraulic turbine governor under different control modes

Analysis of ultra-low frequency oscillation mechanism of hydraulic turbine governor under different control modes

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

Research on Damping Control Index of Ultra-Low-Frequency Oscillation in Hydro-Dominant Power Systems

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