Improving the Energy Capacity and Cost Effectiveness of Flywheel Rotors in Grid-Scale Energy Storage Systems by Varying Their Shape, Speed and Size

2020 ◽  
Author(s):  
Vaishnavi Kale ◽  
Marc Secanell
Keyword(s):  
Cost Effectiveness ◽  
Energy Storage ◽  
Storage Systems ◽  
Cost Ratio ◽  
Operating Speed ◽  
Energy Capacity ◽  
Energy Storage Systems ◽  
Flywheel Rotors ◽  
The Cost ◽  
Flywheel Rotor

Abstract Flywheel energy storage systems (FESS) are an excellent short duration grid energy storage solution; however, their cost and energy storage capacity are typical barriers to their widespread commercialization. FESS can be designed by optimizing the shape of the flywheel rotor, choice of rotor material, operating speed and rotor radius. This study optimizes the flywheel rotor shape at various operating speeds and outer radii. It is found that the energy capacity of the rotor can be improved by choosing an ideal combination of operating speed and rotor radius. Our earlier work showed that including the cost of the FESS as an optimization objective could significantly alter the FESS design [1]. Therefore, the cost effectiveness of the FESS is also studied by comparing rotors made from different materials on an energy-per-cost basis, while the cost ratio of the materials is varied.

H∞ Control Approach to Reduction of Energy Capacity of Energy Storage Systems

2017 ◽  
Vol 137 (8) ◽  
pp. 596-597
Author(s):  
Kenta Koiwa ◽  
Kenta Suzuki ◽  
Kang-Zhi Liu ◽  
Tadanao Zanma ◽  
Masashi Wakaiki ◽  
...  
Keyword(s):  
Energy Storage ◽  
Storage Systems ◽  
Energy Capacity ◽  
Energy Storage Systems ◽  
Control Approach

Comparative study on the cost of hybrid energy and energy storage systems in remote rural communities near Yucatan, Mexico

2022 ◽  
Vol 308 ◽  
pp. 118334
Author(s):  
V. Buenfil Román ◽  
G.A. Espadas Baños ◽  
C.A. Quej Solís ◽  
M.I. Flota-Bañuelos ◽  
M. Rivero ◽  
...  
Keyword(s):  
Energy Storage ◽  
Rural Communities ◽  
Comparative Study ◽  
Storage Systems ◽  
Energy Storage Systems ◽  
Hybrid Energy ◽  
The Cost

scholarly journals The influence of the form of graphs of electrical loads of consumers on the efficiency of price-dependent control based on the systems of electrical energy storage

2020 ◽  
Vol 82 (1) ◽  
pp. 291-303
Author(s):  
A. P. Dzyuba
Keyword(s):  
Energy Storage ◽  
Storage Systems ◽  
Federal District ◽  
Energy Storage Systems ◽  
Cost Of Electricity ◽  
Central Federal District ◽  
Industrial Energy ◽  
Electrical Loads ◽  
Cost Parameters ◽  
The Cost

One of the innovative directions of the prospective development of electric power complexes of the countries of the world is the technology of smart power supply networks, the main element of which is the system of industrial energy storage. They began to be widely used for use as local energy storage devices used in combination with renewable energy sources. The purpose of the study is to analyze the influence of the shape of the graphs of consumers' electrical loads on the effect obtained in the process of price-dependent energy management based on industrial energy storage systems in the current conditions of procurement in the wholesale and retail electricity markets of Russia. The methods of analysis, synthesis, and systems approach are used. To carry out the study, we took data on the characteristics of typical graphs of electric loads of various types of large consumers, price parameters of electricity supply from the retail electricity market, valid for consumers of the Central Federal District. Based on the three basic types of hourly electricity consumption schedules, which have different indicators of daily load factors, calculations were made of changes in the parameters of the cost of electricity purchases and average prices for the purchase of electricity, as well as the comparative characteristics of cost parameters and average prices were revealed. Based on the analysis of the parameters of the cost of electricity and average purchase prices, the example of the Voronezh region investigated the direction of change in the total cost of electricity purchases and average purchase tariffs as the fill factor of daily load schedules changes. The dependence of the effects of lowering the average price of electricity purchases on the fill factor was revealed. Based on the data on the price parameters of all electric power components for the regions of the Central Federal District, the cost parameters and average tariffs for the purchase of electricity were calculated, which made it possible to identify the uneven parameters of both the monthly costs of purchasing electricity before and after the use of electric energy storage systems, and the parameters for reducing the average purchase tariffs electricity after applying storage systems. The analysis of the effects of the use of energy storage systems for different demand schedules and levels of rated voltage was carried out, which revealed a tendency to increase the effect of a decrease in average prices for the purchase of electricity as the level of rated voltage decreases. The results can be used by employees of energy companies in Russia or energy services of industrial enterprises of the Central Federal District in the process of analysis of investment projects on the use of industrial energy storage systems.

scholarly journals STORAGE SCHEDULING SCHEME FOR DISTRIBUTED ENERGY GENERATION SOURCES

2019 ◽  
Vol 1 (02) ◽  
pp. 93-102
Author(s):  
Nayana Shetty
Keyword(s):  
Energy Storage ◽  
Storage Systems ◽  
Renewable Energy Sources ◽  
Magnetic Core ◽  
Energy Resources ◽  
Distributed Energy Resources ◽  
Distributed Energy ◽  
Energy Storage Systems ◽  
Distributed Energy Generation ◽  
The Cost

Innumerable methods of generating, delivering and consuming electricity has become very prominent in the recent days due to the emergence of the distributed energy resources that are comprised of renewable energy sources and the energy storage systems. The prevailing energy storage systems for the distributed energy resources has its own challenges that are related to the methods of storage, the cost of the storage and their functioning. So the paper puts forward a novel energy accumulator that is supported by a rotating magnetic core as storage for the distributed energy resources. The proposed method brings down the operational, technical and financial complexities in storage of the distributed energy resources.

Potential use of cold thermal energy storage systems for better efficiency and cost effectiveness

2010 ◽  
Vol 42 (12) ◽  
pp. 2296-2303 ◽  
Author(s):  
M.A. Ehyaei ◽  
A. Mozafari ◽  
A. Ahmadi ◽  
P. Esmaili ◽  
M. Shayesteh ◽  
...  
Keyword(s):  
Cost Effectiveness ◽  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Storage Systems ◽  
Energy Storage Systems ◽  
Thermal Energy Storage Systems ◽  
Potential Use

Feasibility Study for Small Scaling Flywheel-Energy-Storage Systems in Energy Harvesting Systems

2014 ◽  
Vol 1 (3-4) ◽  
Author(s):  
Gabriel Ertz ◽  
Jens Twiefel ◽  
Malte Krack
Keyword(s):  
Energy Storage ◽  
Eddy Currents ◽  
Storage Systems ◽  
Fiber Reinforced ◽  
Flywheel Energy Storage ◽  
Energy Storage Systems ◽  
Flywheel Rotors ◽  
Isotropic Materials ◽  
Ring Shape ◽  
Flat Disk

AbstractTwo concepts of scaled micro-flywheel-energy-storage systems (FESSs): a flat disk-shaped and a thin ring-shaped (outer diameter equal to height) flywheel rotors were examined in this study, focusing on material selection, energy content, losses due to air friction and motor loss. For the disk-shape micro-FESS, isotropic materials like titanium, aluminum, steel and wolfram are shown to be suitable as a flywheel rotor. Wound fiber reinforced composite plastics (T1000-, T300-carbon fibers and carbon nanotubes “CNTs”) were investigated for the flywheel in a ring shape. It was shown that isotropic materials reach the highest energy densities in the shape of a Laval disk with a rim. A micro-FESS with wolfram flywheel would reach the highest half-time-periods due to its high density, and thus, it is the favored material to design a flat disk-shaped micro-FESS with low standby-losses. Fiber reinforced plastic flywheels in ring shape reach the highest energy densities, from 150 W h/kg (T300) to 2,600 W h/kg (CNT), but display higher standby-losses as well. A scaling of the rotors was done within this study and showed that air friction is influenced by the shape of the examined flywheel rotors and the material. A linear correlation of down scaling and air friction losses was shown. As a motor/generator type, an ironless air coil Halbach array motor was suggested. Motor losses due to eddy currents in the stator coil were estimated. Losses correlated in square with downscaling. FESSs with wolfram and CNT showed the lowest standby-losses due to eddy currents.

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