Design Study of 15-MW Fully Superconducting Generators for Offshore Wind Turbine

Saruwatari, Masumi; Yun, K. W.; Iwakuma, Masataka; Tamura, Koyo; Hase, Yoshiji; Sasamori, Yuichiro; Izumi, Teruo

doi:10.1109/tasc.2016.2535315

Cited by 43 publications

(9 citation statements)

References 4 publications

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“…Given this fact, many fully superconducting machine designs have adopted MgB 2 coils as armature windings to avoid unbearable AC loss [29][30][31]. To maintain high electrical and magnetic loadings, while decreasing AC loss, multifilamentary HTS CCs have been implemented into electrical machines as an alternative [32]. The typical structure and composites of different superconductors can be found in Figure 2.…”

Section: Superconducting Materials Applied To Electrical Machinesmentioning

confidence: 99%

Alternating Current Loss of Superconductors Applied to Superconducting Electrical Machines

Zhang¹,

Wen²,

Grilli

et al. 2021

Energies

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Superconductor technology has recently attracted increasing attention in power-generation- and electrical-propulsion-related domains, as it provides a solution to the limited power density seen by the core component, electrical machines. Superconducting machines, characterized by both high power density and high efficiency, can effectively reduce the size and mass compared to conventional machine designs. This opens the way to large-scale purely electrical applications, e.g., all-electrical aircrafts. The alternating current (AC) loss of superconductors caused by time-varying transport currents or magnetic fields (or both) has impaired the efficiency and reliability of superconducting machines, bringing severe challenges to the cryogenic systems, too. Although much research has been conducted in terms of the qualitative and quantitative analysis of AC loss and its reduction methods, AC loss remains a crucial problem for the design of highly efficient superconducting machines, especially for those operating at high speeds for future aviation. Given that a critical review on the research advancement regarding the AC loss of superconductors has not been reported during the last dozen years, especially combined with electrical machines, this paper aims to clarify its research status and provide a useful reference for researchers working on superconducting machines. The adopted superconducting materials, analytical formulae, modelling methods, measurement approaches, as well as reduction techniques for AC loss of low-temperature superconductors (LTSs) and high-temperature superconductors (HTSs) in both low- and high-frequency fields have been systematically analyzed and summarized. Based on the authors’ previous research on the AC loss characteristics of HTS coated conductors (CCs), stacks, and coils at high frequencies, the challenges for the existing AC loss quantification methods have been elucidated, and multiple suggestions with respect to the AC loss reduction in superconducting machines have been put forward. This article systematically reviews the qualitative and quantitative analysis methods of AC loss as well as its reduction techniques in superconductors applied to electrical machines for the first time. It is believed to help deepen the understanding of AC loss and deliver a helpful guideline for the future development of superconducting machines and applied superconductivity.

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Section: Superconducting Materials Applied To Electrical Machinesmentioning

confidence: 99%

Alternating Current Loss of Superconductors Applied to Superconducting Electrical Machines

Zhang¹,

Wen²,

Grilli

et al. 2021

Energies

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“…However, hybrid type of CCSS can be applied to deep water as it serves to connect the pile foundation and the tower by extending the upper shaft while keeping the cross section of the support structure. In addition, the trend of offshore turbines is large-capacity turbines of 15 MW [23,24], and, to secure economic efficiency according to the increase in turbine capacity, concrete materials that are advantageous in terms of cost need to be used. Thus, CCSS is a support structure that can secure economical advantage and can be applied to large-capacity turbines and deep water.…”

Section: Introductionmentioning

confidence: 99%

Design Optimization of Conical Concrete Support Structure for Offshore Wind Turbine

Kim

2020

Energies

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Various types of support structures for offshore wind turbine have been developed, and concrete structures have attracted attention due to many advantages. Although many studies have been conducted on the design of the existing steel structures, information and research on the design of concrete support structures are insufficient. Therefore, in this paper, a structural analysis model of conical concrete support structure (CCSS) is established and design optimization is presented. A detailed performance evaluation and the design of prestressed concrete were performed under the marine conditions of Phase 1 test site of southwest offshore wind project in Korea. The fluid–soil–structure interaction (FSI) was applied using the added mass method and soil spring model to represent the effects of water and soil. With the result of quasi-static analysis, a post-tensioning design was implemented by applying prestressing steel, and CCSS showed sufficient rigidity. From the natural frequency analysis, CCSS has a dynamic structural stability, and, in response spectrum and time-history analyses, the CCSS was safe enough under the earthquake loads. The methods and conclusions of this study can provide a theoretical reference for the structural analysis and design of concrete support structures for offshore wind turbines.

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“…In recent years, extensive research has been carried out toward the performance improvement of the HTS generator both (i) in the electrical and mechanical design [16], (ii) in increasing the operating temperature [17], (iii) in developing totally or partially superconducting generator [18]. The analysis of the technical performance and the life cycle assessment have also been analyzed and explored in [19].…”

Section: Introductionmentioning

confidence: 99%

Future Power Distribution Grids: Integration of Renewable Energy, Energy Storage, Electric Vehicles, Superconductor, and Magnetic Bus

Muttaqi

Islam

Sutanto

2019

IEEE Trans. Appl. Supercond.

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This paper focuses on a review of the state of the art of future power grids, where new and modern technologies will be integrated into the power distribution grid, and will become the future key players for electricity generation, transmission, and distribution. The current power grids are undergoing an unprecedented transformation from the original design, changing the way how energy has been produced, delivered, and consumed over the past century. This new energy era includes the integration of renewable sources such as wind and solar, supported by the distributed or community energy storage, to power distribution grids through innovative high-frequency magnetic links and power-electronic converters. The use of emission free transportation, such as electric vehicles, and energy efficient technologies, such as superconducting generators and storage systems, are also rapidly emerging and will be integrated into the power grids in the foreseeable future. However, it is necessary to reconsider the current paradigms of system analysis and plan with a focus on how to achieve the most flexible, efficient, and reliable power grid for the future-the one that enables operation in a domain which is very different than the current one to deliver the services to consumers at an affordable cost.

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Design Study of 15-MW Fully Superconducting Generators for Offshore Wind Turbine

Cited by 43 publications

References 4 publications

Alternating Current Loss of Superconductors Applied to Superconducting Electrical Machines

Alternating Current Loss of Superconductors Applied to Superconducting Electrical Machines

Design Optimization of Conical Concrete Support Structure for Offshore Wind Turbine

Future Power Distribution Grids: Integration of Renewable Energy, Energy Storage, Electric Vehicles, Superconductor, and Magnetic Bus

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