Modeling and control of an open accumulator Compressed Air Energy Storage (CAES) system for wind turbines

Saadat, Mohsen; Shirazi, Farzad A.; Li, Perry Y.

doi:10.1016/j.apenergy.2014.09.085

Cited by 100 publications

(39 citation statements)

References 21 publications

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“…He et al [21] gave an optimization of expansion ratios combination and a parametric analysis of a novel CAES system based on threestage single screw expander. Saadat et al [22] designed and analyzed a liquid piston air compressor/expander based nearisothermal CAES system. Zhang et al [23] laid out a thermodynamic analysis of a four-stage radial turbine used for CAES system.…”

Section: Introductionmentioning

confidence: 99%

Energy efficiency analysis and off-design analysis of two different discharge modes for compressed air energy storage system using axial turbines

et al. 2016

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Keywords:Compressed air energy storage Round trip cycle Axial turbine Off-design analysis Energy efficiency analysis a b s t r a c t Compressed air energy storage (CAES) system is an "electricity to electricity" device. To reveal the energy conversion process and understand the energy loss principle are critical to improve the energy conversion efficiency. In this paper, the charge/discharge process analysis of an axial turbine based CAES with constant volume is executed in constant turbine inlet pressure mode and variable turbine inlet pressure mode. Firstly, the energy efficiency analysis of a whole round trip cycle of CAES system under design condition is carried out. The second law efficiencies of the operation mode 1 and the operation mode 2 are 44.56% and 45.16%, respectively. It also can be found that the throttling loss in operation mode 1 can be offset by the benefits of higher isentropic efficiency of turbines. Then, the off-design analysis of these two operation modes is implemented by considering the different power levels and speed levels. The mass flow rates of working fluids across the expansion train both increase with the increased load rate or the decreased speed. The load rate or speed both have the positive effect on the exergy efficiency and the energy generated per unit volume of storage, but have the negative effect on the heat rate.

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Section: Introductionmentioning

confidence: 99%

Energy efficiency analysis and off-design analysis of two different discharge modes for compressed air energy storage system using axial turbines

et al. 2016

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“…However, Fig. 5 shows that extreme-scale turbines (10 MW or greater) with SE-glass and S-glass towers can provide substantial energy storage times, on the order of 24 h. This duration of storage capacity generally is enough to provide a smooth and constant electrical power supply [20], and is notable since carbon fiber may represent the next generation of tower material. Also, this storage time is competed to the conventional CAES that relies on the possibilities of using a cavern or other underground geological formation enabling a large storage volume [21].…”

Section: Impact Of Tower Design On Tower Storagementioning

confidence: 97%

Hydraulic-electric hybrid wind turbines: Tower mass saving and energy storage capacity

2016

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a b s t r a c tThis study investigates concept of introduction of a hydraulic motor in the nacelle to convert rotor shaft work into hydraulic power that is transmitted to the electric generator at ground/sea level. This combination of hydraulic and electric power generation can help simplify or even eliminate the gearbox, and significantly reduce the head weight mass that the tower needs to support. Also, this hybrid concept allows energy storage in the tower which can reduce electric generator size. The analytical technique for tower mass savings employed herein was validated and used to show that 33%e50% of the tower mass may be saved through decreased tower thickness. In addition, the hydraulic-electric generator concept is compatible with employing isothermal CAES in the tower. Analysis based on cross-over pressure for the design limit indicates that this energy storage concept provides more than 24 h of energy storage if one considers S-glass towers of 10 MW or more. To accompany the above engineering analysis, a CAPEX cost model was developed based on recent production wind turbines and system designs. The hydraulicelectric hybrid system with CAES was estimated to yield a total CAPEX savings of 17% due to a substantial decrease in generator and electrical infrastructure costs.

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“…The use of super-capacitors in conjunction with battery technology is studied and evaluated [13]. Integrating compressed air energy storage into wind turbines is also investigated [14,15] such that load levelling, power smoothing and downsizing of the electrical system can be achieved. Refs.…”

Section: Electrical Energy Storage and Gridsmentioning

confidence: 99%

Energy storage systems for a low carbon future – in need of an integrated approach

2015

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Modeling and control of an open accumulator Compressed Air Energy Storage (CAES) system for wind turbines

Cited by 100 publications

References 21 publications

Energy efficiency analysis and off-design analysis of two different discharge modes for compressed air energy storage system using axial turbines

Energy efficiency analysis and off-design analysis of two different discharge modes for compressed air energy storage system using axial turbines

Hydraulic-electric hybrid wind turbines: Tower mass saving and energy storage capacity

Energy storage systems for a low carbon future – in need of an integrated approach

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