scholarly journals Power Regulation Strategy of Virtual Pumped Storage Power Station Based on Compressed Air Energy Storage

2019 ◽  
Vol 677 ◽  
pp. 032030
Author(s):  
Jiayu You ◽  
Tong Jiang
Keyword(s):  
Energy Storage ◽  
Compressed Air ◽  
Compressed Air Energy Storage ◽  
Power Station ◽  
Power Regulation ◽  
Pumped Storage

scholarly journals Comparing Subsurface Energy Storage Systems: Underground Pumped Storage Hydropower, Compressed Air Energy Storage and Suspended Weight Gravity Energy Storage

2020 ◽  
Vol 162 ◽  
pp. 01001
Author(s):  
Javier Menéndez ◽  
Falko Schmidt ◽  
Jorge Loredo
Keyword(s):  
Energy Storage ◽  
Storage Systems ◽  
Renewable Energy Sources ◽  
Compressed Air ◽  
System Control ◽  
Compressed Air Energy Storage ◽  
Energy Storage Systems ◽  
Power System Control ◽  
Underground Reservoir ◽  
Pumped Storage

In the current energy context, intermittent and non-dispatchable renewable energy sources, such as wind and solar photovoltaic (generation does not necessarily correspond to demand), require flexible solutions to store energy. Energy storage systems (ESS) are able to balance the intermittent and volatile generation outputs of variable renewable energies (VRE). ESS provide ancillary services such as: frequency, primary and voltage control to the power grid. In order to fulfil the power system control, ESS can switch within seconds for different operation modes. Many times, ESS imply environment impacts on landscape and society. To solve this problem, disused underground spaces, such as closed mines, can be used as underground reservoir for energy storage plants. In this paper, a comparative analysis between underground pumped storage hydropower (UPSH), compressed air energy storage (CAES) and suspended weight gravity energy storage (SWGES) with suspended weights in abandoned mine shafts is carried out. Pumped storage hydropower (PSH) is the most mature concept and account for 99% of bulk storage capacity worldwide. The results obtained show that in UPSH and CAES plants, the amount of stored energy depends mainly on the underground reservoir capacity, while in SWGES plants depends on the depth of the mine shafts and the mass. The energy stored in a SWGES plant (3.81 MWh cycle-1 with 600 m of usable depth assuming 3,000 tonne suspended weight) is much lower than UPSH and CAES plants.

Compressed Air Energy Storage for a Small Size Standalone Plant Powered by a Solar Power Unit and a Gas Turbine

2020 ◽  
Author(s):  
Gianmario L. Arnulfi ◽  
Giulio Croce
Keyword(s):  
Energy Storage ◽  
Gas Turbine ◽  
Power Unit ◽  
Solar Power ◽  
Compressed Air ◽  
Compressed Air Energy Storage ◽  
Capital Costs ◽  
Turbo Compressor ◽  
Pumped Storage ◽  
Battery Energy

Abstract Energy storage can balance heat and power demand and production over different time scales, with both technical and economic benefit. Several devices have been proposed, but only two are really utilized: hydro-pumped storage, for large size plants, and electrochemical battery energy storage, for medium and small plants. Compressed Air Energy Storage (CAES) was proposed as an alternative, and two well-known plants, Hunthorf (Germany) and Mac Intosh (United States) have been successfully working for many years. However, due to the huge capital costs, this concept never became widely popular. Here, a bit different approach is proposed: one or more reciprocating compressors and pressurized reservoirs can supply an additional amount of air to a gas turbine. During the “charging” phase, the reciprocating compressors pump air into the reservoirs; during the “discharging” phase, the turbo-expander is fed by both the turbo-compressor and the reservoirs in parallel. The turbo-compressor is partially relieved and fuel can be saved for the same power. This paper focuses on a standalone small size user, served by a solar power unit coupled with a micro gas turbine. The aim is to lay down rules for a proper storage managing.

scholarly journals Seasonal and Multi-Seasonal Energy Storage by Power-to-Methane Technology

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3265
Author(s):  
Kristóf Kummer ◽  
Attila R. Imre
Keyword(s):  
Energy Storage ◽  
Energy Recovery ◽  
Cost Effective ◽  
Time Span ◽  
Compressed Air ◽  
Time Range ◽  
Compressed Air Energy Storage ◽  
Effective Solution ◽  
Pumped Storage ◽  
Storage Technologies

The time-range of applicability of various energy-storage technologies are limited by self-discharge and other inevitable losses. While batteries and hydrogen are useful for storage in a time-span ranging from hours to several days or even weeks, for seasonal or multi-seasonal storage, only some traditional and quite costly methods can be used (like pumped-storage plants, Compressed Air Energy Storage or energy tower). In this paper, we aim to show that while the efficiency of energy recovery of Power-to-Methane technology is lower than for several other methods, due to the low self-discharge and negligible standby losses, it can be a suitable and cost-effective solution for seasonal and multi-seasonal energy storage.

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