scholarly journals ASYNCHRONOUS THREE-PHASE MACHINE DRIVEN AS GENERATOR BY A TWIN-SCREW EXPANDER

2021 ◽  
Vol 2020 (1) ◽  
pp. 1-8
Author(s):  
Claudia BORZEA ◽  
Adrian SAVESCU ◽  
Iulian VLADUCA ◽  
Adrian STOICESCU
Keyword(s):  
Energy Storage ◽  
Compressed Air ◽  
Storage Facility ◽  
Generator System ◽  
Control Cabinet ◽  
Three Phase ◽  
Twin Screw ◽  
Absorbed Power ◽  
Automation Control ◽  
Power Curves

The paper presents the functioning regimes of a 132 kW asynchronous three-phase machine, used for the expander-generator system in a compressed air energy storage facility. The installation consists of a 110 kW twin-screw electro-compressor, which supplies pressurized air up to ~16 bar into a 50 cubic meters storage vessel. The compressed air is afterwards released from the reservoir into expander’s inlet, spinning its shaft. When the expander’s shaft spins the electric machine over its synchronous speed, this one enters in generator mode, supplying electric power into the grid. Two power analysers installed on the automation control cabinet monitor the generated/absorbed power and the power supplied/consumed by the system from the grid. Using the data acquired by means of PLC during commissioning tests, we plotted the power curves, differential pressure and significant temperatures, as well as the electric machine’s speed.

Conventional and advanced exergy analysis of a grid connected underwater compressed air energy storage facility

2019 ◽  
Vol 242 ◽  
pp. 1198-1208 ◽  
Author(s):  
Mehdi Ebrahimi ◽  
Rupp Carriveau ◽  
David S.-K. Ting ◽  
Andrew McGillis
Keyword(s):  
Energy Storage ◽  
Exergy Analysis ◽  
Compressed Air ◽  
Storage Facility ◽  
Compressed Air Energy Storage

scholarly journals Fuel Flexibility in Compressed Air Energy Storage Plants

1985 ◽  
Author(s):  
B. Basler ◽  
P. Zaugg
Keyword(s):  
Energy Storage ◽  
Power Plant ◽  
Operating Cost ◽  
Operating Experience ◽  
Compressed Air ◽  
Storage Facility ◽  
Compressed Air Energy Storage ◽  
Fuel Flexibility ◽  
Charging Energy ◽  
Storage Processes

The pneumatic storage of energy is one of the few economical storage processes which can be considered at present for large quantities of energy. Present Compressed Air Energy Storage (CAES) plants are designed on the basis of construction and operating experience at Huntorf, the world’s first air-storage plant [1]. That means, that the turbine of the plant is equipped with combustors to increase the power output during turbine operation, and to reduce the volume and cost of the air storage facility as well as the quantity and cost of the required charging energy [2]. In this paper it is explained that the Brown Boveri CAES turbomachinery is able to burn a variety of different fuels. This opens in many cases the possibility to choose a cheaper or better available fuel to reduce furthermore the operating cost of this kind of power plant.

scholarly journals Compressed air energy storage facility with water tank for thermal recovery

2020 ◽  
Vol 180 ◽  
pp. 02002
Author(s):  
Iulian Vlăducă ◽  
Claudia Borzea ◽  
Dan Ionescu ◽  
Alexandra Ţăranu ◽  
Răzvan Ciobanu ◽  
...  
Keyword(s):  
Energy Storage ◽  
Electric Power ◽  
Waste Heat ◽  
Thermal Recovery ◽  
Compressed Air ◽  
Small Scale ◽  
Air Cooling ◽  
Water Tank ◽  
Compressed Air Energy Storage ◽  
Twin Screw

The paper presents the prototype of the first Romanian Compressed Air Energy Storage (CAES) installation. The relatively small scale facility consists of a twin-screw compressor, driven by a 110 kW threephase asynchronous motor, which supplies pressurized air into a 50m3 reservoir, of 20 bar maximum pressure. The air from the vessel is released into a twin-screw expander, whose shaft spins a 132 kW electric generator. The demonstrative model makes use of a 5m3 water tank acting as heat transfer unit, for minimising losses and increasing efficiency and the electric power generated. Air compression and decompression induce energy losses, resulting in a low efficiency, mainly caused by air heating during compression, waste heat being released into the atmosphere. A similar problem is air cooling during decompression, lowering the electric power generated. Thus, using a thermal storage unit plays an essential role in the proper functioning of the facility and in generating maximum electric power. Supervisory control and data acquisition is performed from the automation cabinets. During commissioning tests, a constant stable power of around 50 kW with an 80 kW peak was recorded.

scholarly journals Thermodynamic analysis of the Compressed Air Energy Storage system coupled with the Underground Thermal Energy Storage

2019 ◽  
Vol 137 ◽  
pp. 01023 ◽  
Author(s):  
Rafał Hyrzyński ◽  
Paweł Ziółkowski ◽  
Sylwia Gotzman ◽  
Bartosz Kraszewski ◽  
Janusz Badur
Keyword(s):  
Renewable Energy ◽  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Gas Turbines ◽  
Electricity Generation ◽  
Power Plants ◽  
Compressed Air ◽  
Storage Facility ◽  
Underground Caverns

Improvement of flexibility is one of the key challenges for the transformation of the Polish Power System aiming at a high share of renewable energy in electricity generation. Flexible and dispatchable power plants will contribute to this ongoing transformation process as they compensate for fluctuations in electricity generation from renewable energy sources such as wind and photovoltaics. In this context, CAES storage tanks are currently the only alternative to storage facilities using pumped-storage hydroelectricity due to the possibility of obtaining the appropriate energy capacity of the storage facility. However, a relative disadvantage of these plants is the heat loss caused by the cooling of the air after compression. The basic elements of the CAES warehouse are: an air compression station, a compressed air reservoir that is also a storage facility (in the existing solutions, these are underground caverns), an expansion station with combustion chambers and gas turbines, and a generator. A key aspect of CAES is the optimal configuration of the thermodynamic cycle. In this paper, the situation of cooperation between the current conventional power plants and wind farms is first analysed, and then, based on thermodynamic models, the process of storing thermal and electrical energy in the CAES system coupled with heat recovery after the gas turbine is analysed. A solution with a ground heat exchanger was also proposed, as the soil, due to its properties, may serve as a thermal energy storage. The paper also analyzes the discharge of the heat storage based on CFD approaches. The ground can be charged during the cooling down of the compressed air. On the other hand, thermal energy was recovered when water flowing to the heat customers was heated. On the basis of non-stationary calculations, the heat stream received from the underground thermal energy storage was estimated.

Optimization of a cavern‐based compressed air energy storage facility with an efficient adaptive genetic algorithm

2020 ◽  
Vol 2 (6) ◽  
Author(s):  
Mehdi Ebrahimi ◽  
David S‐K. Ting ◽  
Rupp Carriveau ◽  
Andrew McGillis ◽  
Davin Young
Keyword(s):  
Genetic Algorithm ◽  
Energy Storage ◽  
Compressed Air ◽  
Adaptive Genetic Algorithm ◽  
Storage Facility ◽  
Compressed Air Energy Storage
Sign in / Sign up

Export Citation Format

Share Document