Modeling and control of a novel compressed air energy storage system for offshore wind turbine

Saadat, Mohsen; Li, Perry Y.

doi:10.1109/acc.2012.6315575

Cited by 32 publications

(19 citation statements)

References 7 publications

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“…In addition, as we see from Table 3, CAES also shows higher volumetric and mass energy and power outputs in comparison to PHS [17]. CAES profits are highly variable and economic feasibility is high primarily when natural gas prices are low and electricity prices high [18].…”

Section: Compressed Air Energy Storage (Caes)mentioning

confidence: 91%

“…Unfortunately the difficulty of finding appropriate storage sites (i.e., in undersea underground caverns) and the difficulties of operating gas turbines in such locations makes these hybrid systems unattractive [20]. Some hybrid-wind approaches store excess energy in pressure vessels (without the need for gas turbines) prior to electrical generation to down-size expensive electrical components [17]. Cryogenic storage systems may even cool air or another gas down to a low volume liquid phase-this fuel is then stored in thermally insulated chambers for release in gaseous phase through a turbine to generate electricity.…”

Section: Compressed Air Energy Storage (Caes)mentioning

confidence: 99%

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A Numerical and Graphical Review of Energy Storage Technologies

2014

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More effective energy production requires a greater penetration of storage technologies. This paper takes a looks at and compares the landscape of energy storage devices. Solutions across four categories of storage, namely: mechanical, chemical, electromagnetic and thermal storage are compared on the basis of energy/power density, specific energy/power, efficiency, lifespan, cycle life, self-discharge rates, capital energy/power costs, scale, application, technical maturity as well as environmental impact. It's noted that virtually every storage technology is seeing improvements. This paper provides an overview of some of the problems with existing storage systems and identifies some key technologies that hold promise.

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Section: Compressed Air Energy Storage (Caes)mentioning

confidence: 91%

Section: Compressed Air Energy Storage (Caes)mentioning

confidence: 99%

A Numerical and Graphical Review of Energy Storage Technologies

2014

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“…Gas compression and expansion has many applications in pneumatic and hydraulic systems, including in the Compressed Air Energy Storage (CAES) system for offshore wind turbine that has recently been proposed in [1,2]. In the proposed CAES system, high pressure (∼20-30MPa) compressed air is stored in a dual chamber storage vessel with both liquid and compressed air.…”

Section: Introductionmentioning

confidence: 99%

Optimal Control Experimentation of Compression Trajectories for a Liquid Piston Air Compressor

Shirazi

Saadat

Yan

et al. 2013

Volume 1: Heat Transfer in Energy Systems; Thermophysical Properties; Theory and Fundamental Research in Heat Transfer

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Air compressor is the critical part of a Compressed Air Energy Storage (CAES) system. Efficient and fast compression of air from ambient to a pressure ratio of 200-300 is a challenging problem due to the trade-off between efficiency and power density. Compression efficiency is mainly affected by the amount of heat transfer between the air and its surrounding during the compression. One way to increase heat transfer is to implement an optimal compression trajectory, i.e., a unique trajectory maximizing the compression efficiency for a given compression time and compression ratio. The main part of the heat transfer model is the convective heat transfer coefficient (h) which in general is a function of local air velocity, air density and air temperature. Depending on the model used for heat transfer, different optimal compression profiles can be achieved. Hence, a good understanding of real heat transfer between air and its surrounding wall inside the compression chamber is essential in order to calculate the correct optimal profile. A numerical optimization approach has been proposed in previous works to calculate the optimal compression profile for a general heat transfer model. While the results show a good improvement both in the lumped air model as well as Fluent CFD analysis, they have never been experimentally proved. In this work, we have implemented these optimal compression profiles in an experimental setup that contains a compression chamber with a liquid piston driven by a water pump through a flow control valve. The optimal trajectories are found and experimented for different compression times. The actual value of heat transfer coefficient is unknown in the experiment. Therefore, an iterative procedure is employed to obtain h corresponding to each compression time. The resulted efficiency versus power density of optimal profiles is then compared with ad-hoc constant flow rate profiles showing up to %4 higher efficiency in a same power density or %30 higher power density in a same efficiency in the experiment.

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“…Gas compression and expansion has many applications in pneumatic and hydraulic systems, including in the Compressed Air Energy Storage (CAES) system for offshore wind turbine that has recently been proposed in [1,2]. Since the air compressor/expander is responsible for the majority of the storage energy conversion, it is critical that it is efficient and sufficiently powerful.…”

Section: Introductionmentioning

confidence: 99%