Design of a Superconducting Synchronous Generator With LTS Field Windings for 12 MW Offshore Direct-Drive Wind Turbines

Wang, Jin; Qu, Ronghai; Tang, Yuejin; Liu, Yingzhen; Zhang, Bin; He, Jie; Zhu, Zhe; Fang, Haiyang; Su, Lushun

doi:10.1109/tie.2015.2415758

Cited by 57 publications

(14 citation statements)

References 27 publications

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“…It can be seen that the total mass of the HTS-DSDDG is 321.47 tons, of which the percentage of structure support mass is the maximum, up to 52.3%, 168 tons. Then the mass of silicon steel is the second biggest percentage, it reaches 38.7%, including outer stator 13.3%, rotor 5.8%, ferromagnetic ring 2.9% and [2], [12], [36].…”

Section: Size Weight and Cost Of The Proposed Hts Generator A mentioning

confidence: 99%

“…In addition, although the output power per volume and the output power per mass of the proposed HTS-DSDDG are both lower than the LTS-SCDDG, the LTS-SCDDG needs extremely low operating temperature, resulting in the more complex cooling system and higher maintenance cost. The existing study indicates that the manufacturing cost of LTS generator is 2 million dollars, but the operation and maintenance cost for 25 years is 1.6 million dollars [12].…”

Section: B Comparison With Existing Conceptual Designsmentioning

confidence: 99%

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Design and Analysis of 10 MW Class HTS Exciting Double Stator Direct-Drive Wind Generator With Stationary Seal

Zhu

Cheng

2019

IEEE Access

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The superconducting (SC) generators are expected to have a promising application for offshore wind generation due to the merits of high power density and high efficiency over the conventional generators. In this paper, a 10-MW conceptual high temperature superconducting (HTS) exciting double stator direct-drive wind generator (HTS-DSDDG) with the stationary seal is proposed and investigated. The proposed HTS-DSDDG has two spatially independent stators: to place HTS field windings and copper armature windings, respectively. Thus, it realizes the stationary seal of the cooling system and removes brushes and slip rings and the other additional excitation device; hence offering the advantages of the high reliability and the low operation & maintenance cost. The main design considerations and the initial design specifications of the 10 MW HTS-DSDDG are given in detail. Furthermore, the electromagnetic characteristics of the HTS-DSDDG under no-load, rated load, and three-phase short-circuit fault conditions are analyzed by the finite element method (FEM). Subsequently, its size, weight, and cost are compared with the existing conceptual 10 MW wind generators. The results reveal that the HTS-DSDDG has excellent electromagnetic performances, such as good sinusoidal voltage, low cogging torque, and torque ripple; besides, its output power per volume is twice than that of the permanent magnet directdrive generator (PMDDG), being comparable to that of the existing conceptual MgB 2 -HTS direct-drive generators.INDEX TERMS Double stator, stationary seal, direct-drive, high temperature superconducting (HTS), magnetic-field modulation, wind generator.

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Section: Size Weight and Cost Of The Proposed Hts Generator A mentioning

confidence: 99%

Section: B Comparison With Existing Conceptual Designsmentioning

confidence: 99%

Design and Analysis of 10 MW Class HTS Exciting Double Stator Direct-Drive Wind Generator With Stationary Seal

Zhu

Cheng

2019

IEEE Access

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“…A lot of research has been focused on this topology [11]- [14]. Compared with the ASART, iron is still used for the stator teeth of the ISART [15]- [16]. The mechanical performance of the iron-cored stator is much better due to the use of robust iron teeth [8].…”

Section: Comparison Of Electromagnetic Performance Of 10mw Supercondumentioning

confidence: 99%

Comparison of Electromagnetic Performance of 10-MW Superconducting Generators With Different Topologies for Offshore Direct-Drive Wind Turbines

Guan

Zhu

Azar

et al. 2017

IEEE Trans. Appl. Supercond.

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Abstract-This paper compares the electromagnetic performance of 10MW superconducting (SC) generators with three different topologies, i.e., iron-cored stator and rotor (ISIRT), iron-cored stator and air-cored rotor (ISART), and air-cored stator and rotor (ASART). The objective is to provide a powerful insight into the advantages and disadvantages of the different topologies, and to establish some design guidelines for selecting an appropriate direct drive SC generator for offshore wind turbine applications. Firstly, the structures of the three SC generator topologies are introduced. Then, the influence of the SC coil cross sectional area on torque capability is compared. After that, three SC generators with different topologies are optimized respectively for further comparison, including the active material cost, weight, harmonics in the electromotive force (EMF), torque ripple, field harmonics in the SC coil, and forces on the rotor and stator components, etc. It is found that, with the same SC quantity, the torque capability of the iron-cored stator and rotor topology is much better than that of the other two topologies. However, the advantage becomes less significant when a larger area of the SC coil is employed. The air gap flux density waveform of the ASART is much smoother than those of the ISIRT and ISART. The torque ripples of the ISIRT and the ISART are much higher than that of the ASART. The field harmonics (both amplitude and frequency) in the SC coil of the ASART are the lowest. For the ISIRT, most of the force on the rotor is acting on the rotor iron, and thus, the SC coil is more likely to be safe from a mechanical performance point of view and the design of the corresponding supporting structure is simple. However, for the air-cored rotor topologies, nearly all the force is acting on the SC coil. For the air-cored stator, the force mainly acts on the armature winding, while for the iron-cored stator, it is mainly on the stator teeth. Due to the excellent mechanical performance of iron, the iron-cored stator is therefore more robust.

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“…The recent development of the superconducting wind generator has significantly reduced the size and weight of the wind turbine nacelle and also reduced the installation cost of offshore wind farms. A 12 MW superconducting generator for the wind turbine was developed with NbTi/Cu cable-based LTS coils cooled with the forced flow supercritical helium at 4 K [13]. Currently, the MgB2 HTS wires are commercially available, which lead to a new direction to develop low cost, compact and lightweight large rating generator having both rotor and stator windings with HTS materials [14].…”

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.

102

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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 of a Superconducting Synchronous Generator With LTS Field Windings for 12 MW Offshore Direct-Drive Wind Turbines

Cited by 57 publications

References 27 publications

Design and Analysis of 10 MW Class HTS Exciting Double Stator Direct-Drive Wind Generator With Stationary Seal

Design and Analysis of 10 MW Class HTS Exciting Double Stator Direct-Drive Wind Generator With Stationary Seal

Comparison of Electromagnetic Performance of 10-MW Superconducting Generators With Different Topologies for Offshore Direct-Drive Wind Turbines

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

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