Design Considerations and Short-Circuit Characteristics of Fully Superconducting Wind Turbine Generators

Dong Liu, Urfan Hasanov, Changqing Ye, Xiaofan Gou, Xuezhou Wang

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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Abstract

Compared with partially superconducting generators, fully superconducting generators (F-SCGs) can further increase the torque density in large direct-drive wind turbine applications. Design trends of F-SCGs intend to increase the electrical loading by applying superconducting wires and boost the current density in the armature winding to meet the critical current density with a safety margin. High currents may cause a low power factor and require the power electronic converter to have a much larger capacity. In an F-SCG, furthermore, torques could be too high, and field and armature currents may exceed the critical currents during a generator short circuit. This paper studies the design of a 20 MW F-SCG with consideration of the control strategy and the power factor, and then evaluates the short circuit characteristic of the F-SCG. The results analysis shows that a capacitive load control should be adopted to avoid a significant drop in the power factor and to make full use of the current-carrying capability of superconductors. An I_{d} = 0 control can also be used with a medium current level. During the short circuit, the negative side is that the phase currents exceed the critical currents and cause quenches. The positive side is that the field currents stay below the critical currents and the torques do not exceed the mechanical limitation of three times the rated torque.

Original languageEnglish
Title of host publicationProceedings of the 12th IEEE PES Asia-Pacific Power and Energy Engineering Conference, APPEEC 2020
Place of PublicationPiscataway, NJ, USA
PublisherIEEE
Number of pages6
ISBN (Electronic)978-1-7281-5748-1
DOIs
Publication statusPublished - 2020
Event12th IEEE PES Asia-Pacific Power and Energy Engineering Conference, APPEEC 2020 - Nanjing, China
Duration: 20 Sep 202023 Sep 2020

Conference

Conference12th IEEE PES Asia-Pacific Power and Energy Engineering Conference, APPEEC 2020
CountryChina
CityNanjing
Period20/09/2023/09/20

Keywords

  • Fully superconducting generator
  • power factor
  • short circuit
  • superconducting armature
  • wind turbine

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