The impact of hump characteristics on variable speed pumped storage units under pump mode and improvement measures

Gao, Chunyang; Yu, Xiangyang; Nan, Haipeng; Guo, Pengcheng; Meng, Zhijie; Ge, Ye

doi:10.1016/j.est.2024.111416

Journal of Energy Storage

2024

DOI: 10.1016/j.est.2024.111416

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The impact of hump characteristics on variable speed pumped storage units under pump mode and improvement measures

Chunyang Gao,

Xiangyang Yu,

Haipeng Nan

et al.

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2024

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Cited by 3 publications

References 30 publications

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Transient Characteristics and Operation Regulation of Grid‐Connected Variable Speed Pumped Storage‐Wind‐Solar Hybrid Power System

Li,

Song,

Guo

2024

Energy Science & Engineering

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This article investigates the transient characteristics and operation regulation of grid‐connected variable speed pumped storage (VSPS)‐wind‐solar hybrid power system (HPS). Firstly, the model of grid‐connected VSPS‐wind‐solar HPS is established. Secondly, based on a calculating example, the transient characteristics of grid‐connected VSPS‐wind‐solar HPS are analyzed by using numerical simulation. Then, the effects of grid parameters and capacity ratios on transient characteristics of the grid‐connected VSPS‐wind‐solar HPS are revealed. Finally, the regulation of governor and frequency converter for the grid‐connected VSPS‐wind‐solar HPS is illuminated. The results indicate that the influence of wind speed disturbance and light intensity disturbance on the whole grid‐connected VSPS‐wind‐solar HPS can be effectively reduced by using the pitch angle controller and VSPS unit, and the overshoot of power grid frequency does not exceed 0.1%, and the adjustment time does not exceed 4.36 s. Compared to the isolated VSPS power station, the regulation quality of the transient characteristics of grid‐connected VSPS power station is worse. The coupling effect between the wind power station and power grid is weak. The increase of the capacity ratios of VSPS power station and wind power station has both advantages and disadvantages for the transient process of rotational speed of pump‐turbine. The increase of the capacity ratio of solar power station is disadvantageous for the transient process of rotational speed of pump‐turbine. The regulation effect of the control link PI‐1 plays a dominant role in the frequency converter. The effect of the parameters for the control links of frequency converter on the regulation quality of grid‐connected VSPS‐wind‐solar HPS is weaker than that of governor.

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Transient Characteristics and Operation Regulation of Grid‐Connected Variable Speed Pumped Storage‐Wind‐Solar Hybrid Power System

Li,

Song,

Guo

2024

Energy Science & Engineering

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Rotating speed pulling-back control and adaptive strategy of doubly-fed variable speed pumped storage unit

Gao,

Yu,

Nan

et al. 2024

Renewable Energy

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Pressure characteristics and force analysis of pump turbine in variable-pressure outlet pump mode

Li,

et al. 2024

Physics of Fluids

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A nonstationary numerical simulation was performed on the outlet pressure stabilization and periodic variable-pressure condition of a pump turbine model in the pumping condition. The objective was to dissect the flow mechanism and force characteristics of components within the outlet variable-pressure pumping condition of the pump turbine and to probe into the stability of the pump turbine under such working conditions. Additionally, the alterations in the runner state, pressure distribution, pressure pulsation, as well as the forces exerted on the runner and top cover during this process were analyzed. The results demonstrated that the internal pressure and flow pattern of the pump turbine under variable-pressure conditions fluctuated periodically in accordance with the outlet pressure. An augmented frequency of the outlet pressure variation led to an elevation in the amplitude of the internal pressure change. Nevertheless, a hysteresis difference was observed in the changes of the flow channel pressure and flow pattern. The pressure pulsation in the runner area was influenced by the runner rotation, static and dynamic interferences in the lobe-free area, and the unsteady flow induced by the alterations in the outlet pressure.

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The impact of hump characteristics on variable speed pumped storage units under pump mode and improvement measures

Cited by 3 publications

References 30 publications

Transient Characteristics and Operation Regulation of Grid‐Connected Variable Speed Pumped Storage‐Wind‐Solar Hybrid Power System

Transient Characteristics and Operation Regulation of Grid‐Connected Variable Speed Pumped Storage‐Wind‐Solar Hybrid Power System

Rotating speed pulling-back control and adaptive strategy of doubly-fed variable speed pumped storage unit

Pressure characteristics and force analysis of pump turbine in variable-pressure outlet pump mode

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