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Comparative Analysis of Bearing Current in Wind Turbine Generators

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  • Ruifang Liu

    (School of Electrical Engineering, Beijing Jiaotong University, Haidian District, Beijing 100044, China)

  • Xin Ma

    (School of Electrical Engineering, Beijing Jiaotong University, Haidian District, Beijing 100044, China)

  • Xuejiao Ren

    (School of Electrical Engineering, Beijing Jiaotong University, Haidian District, Beijing 100044, China)

  • Junci Cao

    (School of Electrical Engineering, Beijing Jiaotong University, Haidian District, Beijing 100044, China)

  • Shuangxia Niu

    (Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong, China)

Abstract

Bearing current problems frequently appear in wind turbine systems, which cause wind turbines the break down and result in very large losses. This paper investigates and compares bearing current problems in three kinds of wind turbine generators, namely doubly-fed induction generator (DFIG), direct-drive permanent magnet synchronous generator (PMSG), and semi-direct-drive PMSG turbines. Common mode voltage (CMV) of converters is introduced firstly. Then stray capacitances of three kinds of generators are calculated and compared through the finite element method. The bearing current equivalent circuits are proposed and simulations of the bearing current are carried out. It is verified that the bearing currents of DFIGs are more serious than the two kinds of PMSG, while common mode current (CMC) of the direct-drive PMSG is much greater than the other two types of wind turbine generators.

Suggested Citation

  • Ruifang Liu & Xin Ma & Xuejiao Ren & Junci Cao & Shuangxia Niu, 2018. "Comparative Analysis of Bearing Current in Wind Turbine Generators," Energies, MDPI, vol. 11(5), pages 1-13, May.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:5:p:1305-:d:148048
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    References listed on IDEAS

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    1. Adabi, M. Ebrahim & Vahedi, Abolfazl, 2013. "A survey of shaft voltage reduction strategies for induction generators in wind energy applications," Renewable Energy, Elsevier, vol. 50(C), pages 177-187.
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    Cited by:

    1. Amr. S. Zalhaf & Mazen Abdel-Salam & Mahmoud Ahmed, 2019. "An Active Common-Mode Voltage Canceler for PWM Converters in Wind-Turbine Doubly-Fed Induction Generators," Energies, MDPI, vol. 12(4), pages 1-12, February.
    2. Fernando Acosta-Cambranis & Jordi Zaragoza & Luis Romeral & Néstor Berbel, 2020. "Comparative Analysis of SVM Techniques for a Five-Phase VSI Based on SiC Devices," Energies, MDPI, vol. 13(24), pages 1-25, December.
    3. Manje Yea & Ki Jin Han, 2020. "Modified Slot Opening for Reducing Shaft-to-Frame Voltage of AC Motors," Energies, MDPI, vol. 13(3), pages 1-9, February.
    4. Xuejiao Ren & Ruifang Liu & Erle Yang, 2019. "Modelling of the Bearing Breakdown Resistance in Bearing Currents Problem of AC Motors," Energies, MDPI, vol. 12(6), pages 1-9, March.
    5. Usha Sengamalai & T. M. Thamizh Thentral & Palanisamy Ramasamy & Mohit Bajaj & Syed Sabir Hussain Bukhari & Ehab E. Elattar & Ahmed Althobaiti & Salah Kamel, 2022. "Mitigation of Circulating Bearing Current in Induction Motor Drive Using Modified ANN Based MRAS for Traction Application," Mathematics, MDPI, vol. 10(8), pages 1-24, April.

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