Wind farms associated with flywheel energy storage plants

Chudý, Michal; Herbst, Lynette; Lalk, Jörg

doi:10.1109/isgteurope.2014.7028763

Cited by 4 publications

(5 citation statements)

References 15 publications

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“…Algebraic optimization models were simulated and analysed using actual wind speed data from a wind farm. The feasibility of the plan was confirmed by the simulation results [13]. The authors modeled and simulated a hydrostatic wind turbine with a compressed air energy storage (CAES) system.…”

Section: Introductionmentioning

confidence: 85%

Research on the Robustness of the Constant Speed Control of Hydraulic Energy Storage Generation

et al. 2018

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Energy storage plays a major role in solving the fluctuation and intermittence problem of wind and the effective use of wind power. The application of the hydraulic accumulator is the most efficient and convenient way to store wind energy in hydraulic wind turbines. A hydraulic energy storage generation system (HESGS) can transform hydraulic energy stored in the hydraulic accumulator into stable and constant electrical energy by controlling the variable motor, regardless of wind changes. The aim of the present study is to design a constant speed control method for the variable motor in the HESGS and investigate the influence of the controller's main parameters on the resistance of the HESGS to external load power disturbances. Mathematical equations of all components in this system are introduced and an entire system simulation model is built. A double closed-loop control method of the variable motor is presented within this paper, which keeps the motor speed constant for the fixed frequency of electrical power generated by the HESGS. Ultimately, a series of simulations with different proportional gains and integral gains under the environment of changeless load power step are conducted. At the same time, comparison analyses of the experiment and simulation under variable load power step are performed. The results verify the correctness and the usability of the simulation model, and also indicate that the proposed control method is robust to the disturbances of changing load power.

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Section: Introductionmentioning

confidence: 85%

Research on the Robustness of the Constant Speed Control of Hydraulic Energy Storage Generation

et al. 2018

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“…where: J M (x)-set of values of the modified objective function for the individuals of the processed generation, J M (x)-value of the modified objective function in the form (15). An important issue, from the point of view of the effectiveness of the genetic algorithm, is how to take into account the penalty function.…”

Section: Selection and Characteristics Of The Optimisation Methodsmentioning

confidence: 99%

“…In the task of minimising the objective function (15), inequality restrictions are taken into account, including: N TW -number of wind power plants, N ME -number of storage systems, P WPPn -rated power of the power plant, A FESSn -rated capacity of the flywheel energy storage system, P FESSn -power of the energy storage system, and rate of elimination of permitted interruptions k L .…”

Section: Objective Function Decision Variables Restrictionsmentioning

confidence: 99%

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Reduction of Power Production Costs in a Wind Power Plant–Flywheel Energy Storage System Arrangement

2019

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The paper presents issues of optimisation of a wind power plant–energy storage system (WPP-ESS) arrangement operating in a specific geographical location. An algorithm was developed to minimise the unit discounted cost of electricity generation in a system containing a wind power plant and flywheel energy storage. In order to carry out the task, population heuristics of the genetic algorithm were used with modifications introduced by the author (taking into account the coefficient of variation of the generation in the quasi-static term of the penalty and the selection method). The set of inequality restrictions related to the technical parameters of turbines and energy storage and the parameters of energy storage management has been taken into account with the application of the Powell–Skolnick penalty function (Michalewicz modification). The results of sample optimisation calculations for two wind power plants of 2 MW were presented. The effects achieved in the process of optimisation were described—especially the influence of the parameters of the energy storage management system on the unit cost of electricity generation. The use of a system with higher unit costs of energy generation compared to independently operating wind turbines was justified in the context of improving the conditions of compatibility with the power system—the strategy belongs to a power firming group.

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“…In such environments, issues related to frictional surfaces in classical mechanisms are particularly important and drastically limit the equipment lifetime. Therefore, superconducting instruments are a very promising solution in fields like high-speed bearings [1][2][3][4], aerospace [5][6][7], space engineering [8,9], energy storage [10][11][12][13][14], wind turbines [15][16][17][18], systems or cryogenics [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Radial and axial stiffness of superconducting bearings based on YBCO single-domain bulks processed with artificial holes

Antončík

Lojka

Hlásek

et al. 2020

Supercond. Sci. Technol.

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Superconducting magnetic bearings are becoming more widespread, due to the unique properties they provide. Their efficiency is unparallel, there are no issues such as contact, friction, and wear. They require low or minimal maintenance, no lubrication and they work under extreme conditions (cryogenic temperatures, high vacuum). In this contribution, the influence of geometric properties of superconducting bulks on the performance of superconducting bearings was studied. The main focus was paid to load capacity, radial and axial stiffnesses. Two samples with a significantly higher aspect ratio compared to conventional bulks were prepared. One of these samples was synthesized with artificially created holes. The samples were prepared using top-seeded melt-growth process with an additional source of a liquid phase in the form of an underlaying pad. The original thickness of 16 mm of the samples with a diameter of 28 mm was repeatedly ground down. Levitation force and trapped field were measured after each grinding step. Using this approach, the dependence of properties of the bulks on their thickness, scaling of these properties with thickness and the influence that artificial holes can make on the properties of finished single domain bulks were studied. The maximum levitation force was greatly improved for bulks with thicknesses of 2-6 mm. Such data is of the utmost importance in the field of superconducting YBCO single domain bulk ceramics, as it allows for better understanding and further improvement of both the manufacturing process and real-world applications of these materials.

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Wind farms associated with flywheel energy storage plants

Cited by 4 publications

References 15 publications

Research on the Robustness of the Constant Speed Control of Hydraulic Energy Storage Generation

Research on the Robustness of the Constant Speed Control of Hydraulic Energy Storage Generation

Reduction of Power Production Costs in a Wind Power Plant–Flywheel Energy Storage System Arrangement

Radial and axial stiffness of superconducting bearings based on YBCO single-domain bulks processed with artificial holes

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