Cost advantage of adjustable-speed pumped storage unit for daily operation in distributed hybrid system

Feng, Chunhua; Zheng, Yuan; Li, Chaoshun; Mai, Zijun; Wu, Wei; Chen, Huixiang

doi:10.1016/j.renene.2021.05.082

Cited by 26 publications

(5 citation statements)

References 38 publications

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“…Hydropower storage is currently the most mature technology and the largest energy storage technology for equipment. This widely used mechanism has the characteristics of flexible start and stop and flexible function switching; moreover, it can smoothen the fluctuation of wind and solar energy generation better [7,8]. Muhammad et al [9] conducted economic analysis and optimization on the combination of various renewable energy sources (solar and wind) and storage technologies (battery, pumped hydro storage, and hybrid storage) in the off-grid power supply system.…”

Section: Literature Reviewmentioning

confidence: 99%

Integrated energy system optimal scheduling considering the comprehensive and flexible operation mode of pumping storage

et al. 2022

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The integrated energy system (IES) optimal scheduling under the comprehensive flexible operation mode of pumping storage is considered. This system is conducive to the promotion of the accommodation of wind and solar energy and can meet the water, electricity and heat needs of coastal areas far away from the energy center. In this study, the joint dispatch between double pumped storage power stations is used to accommodate wind and solar energy better and smooth their fluctuations on the grid. Through the scheduling of water between the high and low reservoirs of double pumped storage power stations and the reservoir of the seawater desalination plant, the impact of storage capacity constraints on pumped storage power plants is reduced. Moreover, the objective function to build the IES optimization scheduling model is to achieve minimum economic cost. The results reveal that the integrated energy system accommodates all wind energy and solar energy. As such, the system increases the average working time of the pumped storage unit by 1.9 hours and reduces the economic cost by 31.50%. Based on the simulation results, the model can enhance the accommodation capability of wind energy and solar energy and improve the system economy.

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Section: Literature Reviewmentioning

confidence: 99%

Integrated energy system optimal scheduling considering the comprehensive and flexible operation mode of pumping storage

et al. 2022

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“…However, most PSH plants are only capable of regulating their power production output in turbine mode [4], while pumps are only able to run at full capacity. Furthermore, the conventional fixed speed pumped storage units (FSU) cannot meet the requirements of fast and accurate regulation when frequency fluctuation occurs [5,6], especially in the grids with high proportion of intermittent renewable energy [7]. With variable speed drives, (1) the operation efficiency and stability of the turbine can be improved, (2) the pump input power can be regulated, and (3) the unit can respond to the power fluctuation of the power grid in milliseconds by flywheel effect [8].…”

Section: Introductionmentioning

confidence: 99%

The method for identifying the potential of the fast response capability of a variable-speed pumped storage turbine in pump mode

Meng,

Zheng,

Wang

et al. 2024

J. Phys.: Conf. Ser.

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Variable-speed pumped storage technology was being increasingly adopted by new power system to improve the operating and regulating characteristics of the hydropower unit and to stabilize the grid fluctuations. By connecting to a frequency converter, the variable-speed pumped storage unit can respond to grid fluctuations at a speed of hundreds of milliseconds. The fast response capability of a variable-speed pumped storage turbine should be considered in the design stage, be identified during the model test and be used as prerequisite during the commissioning stage of the unit. This article described the method for identifying the fast response capability and methods for improving the power regulation potential of a variable-speed pumped turbine in pump mode. The pipeline hydraulic loss, the guide vanes opening, the energy, cavitation and hump characteristics of the pump are the key parameters and should be carefully considered during the selection of the variable-speed operating zone.

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“…Compared with conventional pumped storage (CPS) units, variable speed pumped storage (VSPS) units can improve the operation efficiency of the turbine by adjusting the rotational speed under pumped and power generation conditions and expand the power regulation range of the unit. Therefore, its more flexible power regulation ability allows it to improve system stability and provides economic benefits during operation by improving dynamic characteristics, and its ability to absorb new energy power fluctuations has been studied [13][14][15]. Consequently, this paper focuses on the optimization operation strategy of VSPS to improve the flexibility of power grid regulation.…”

Section: Introductionmentioning

confidence: 99%

Optimization of an Operation Strategy for Variable Speed Pumped Storage Power System Flexibility

Xu,

Zhao,

Lyu

et al. 2023

Electronics

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With the increase in the grid-connected scale of new energy, the ability to flexibility regulate a power system is greatly challenged. Since a variable speed pumped storage (VSPS) unit has a wider power regulation range and higher operation efficiency than conventional pumped storage (CPS), this study focuses on improving system flexibility with the VSPS unit. First, the probabilistic characteristics of forced outages affecting the flexibility of power units are studied. Considering the uncertainty of the net load prediction error, a probabilistic density method is proposed to quantify the flexibility of the power system. Second, in order to improve the flexibility of the system and take into account the comprehensive benefits of the VSPS unit, an optimization model for the VSPS unit to improve the flexibility of the grid was established based on bacterial colony chemotaxis that takes into consideration the operational constraints of the VSPS unit. Finally, to verify the effectiveness of the proposed optimization strategy using simulation, the proposed optimization model is used to compare the advantages of the VSPS unit’s ability to regulate system flexibility with a conventional pumped storage unit.

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Cost advantage of adjustable-speed pumped storage unit for daily operation in distributed hybrid system

Cited by 26 publications

References 38 publications

Integrated energy system optimal scheduling considering the comprehensive and flexible operation mode of pumping storage

Integrated energy system optimal scheduling considering the comprehensive and flexible operation mode of pumping storage

The method for identifying the potential of the fast response capability of a variable-speed pumped storage turbine in pump mode

Optimization of an Operation Strategy for Variable Speed Pumped Storage Power System Flexibility

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