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2004 Fiscal Year Final Research Report Summary

Development of low-cost adjustable -speed generator systems suitable for renewable energy sources

Research Project

Project/Area Number 14350140
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 電力工学・電気機器工学
Research InstitutionIbaraki University

Principal Investigator

OGUCHI Kuniomi  Ibaraki University, the College of Engineering, Professor, 工学部, 教授 (50037868)

Co-Investigator(Kenkyū-buntansha) HOSHI Nobukazu  Ibaraki University, the College of Engineering, Research associate, 工学部, 助手 (70292480)
Project Period (FY) 2002 – 2004
Keywordsadjustable-speed generator / induction generator / secondary excitation / brushless / cascade connection / reluctance type / flux barrier
Research Abstract

Adjustable-speed wound-rotor induction generators are widely used for wind power generation, in which the secondary power is extracted through brushes and slip-rings and is controlled by an inverter. This secondary excitation system requires smaller ratings of the inverter than those of stator power control systems and it is economical. The brushes and slip-rings need periodical maintenance. Therefore, a big maintenance problem may be occur in near future because a large number of generatoras.
In our project, we have mainly studied brushless secondary excitation systems to solve the maintenance problem mentioned above. The major results of our research are as follows :
1.Brushless cascaded induction generator systems
A newly developed cascaded induction generator has been proposed in which the second induction generator has a six-phase winding and a 12-pulse diode rectifier. This system can give very economical solution of the maintenance problem and harmonic current pollution. However, a … More power factor correction may be needed to compensate the poor power factor characteristics. The proposed system is well suited for large power applications.
2.Brushless reluctance-type induction generators
A proto type of the doubly-fed reluctance-type induction generators was built and tested. This generator has a simple structure ; its rotor has no windings and only an iron core with flux barriers, and the stator has double three-phase windings with different pole-numbers. The experimental generator has good control characteristics except for the poor power factor.
3.A novel system of a wound-rotor induction generator
A slip power recover inverter in a conventional wound rotor induction generator system is connected in-parallel with the stator windings through three-phase transformers. We have developed a novel system in which the recovery inverter is connected directly in-series with the stator windings without using the transformers. The system steady-characteristics was examined with computer simulation and the good results were obtained. Transient characteristics will be studied in future for practical applications. Less

  • Research Products

    (6 results)

All 2004 2003 Other

All Journal Article (6 results)

  • [Journal Article] 修正節点解析法によるブラシレス二次励磁システムのシミュレーション2004

    • Author(s)
      加藤真嗣
    • Journal Title

      電気学会論文誌D(産業応用部門誌) Vol.124,No.12

      Pages: 1252-1260

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Small-scale hydropower - Adjustable-speed induction generators2003

    • Author(s)
      S.Kato
    • Journal Title

      IEEE Industry Applications Magazine Vol.9,No.4

      Pages: 32-38

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Small-scale hydropower -Adjustable-speed induction generators2003

    • Author(s)
      S.Kato
    • Journal Title

      IEEE Industry Applications Magazine Vol.9, No.4

      Pages: 32-38

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] 高調波低減型ブラシレス二次励磁方式可変速誘導発電機の特性

    • Author(s)
      加藤真嗣
    • Journal Title

      電気学会論文誌B(電力・エネルギー部門誌) 122巻,5号

      Pages: 684-685

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Brushless slip-power recovery system simulation by using modified nodal analysis

    • Author(s)
      S.Kato
    • Journal Title

      IEEJ Transaction on Industry Applications Vol.124, No.12

      Pages: 1252-1260

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Characteristics of variable-speed cascaded induction generator system with reduced harmonic currents

    • Author(s)
      S.Kato
    • Journal Title

      IEEJ Transaction on Power and Energy Vol.122-B, No.5

      Pages: 684-685

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2006-07-11  

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