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Investigation on Overvoltage Distribution in Stator Windings of Permanent Magnet Synchronous Wind Turbines

Author

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  • Shulin Li

    (Beijing Goldwind Science and Technology Innovation Wind Power Equipment Co., Ltd., Beijing 100044, China)

  • Fuqiang Tian

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

  • Haitao He

    (Beijing Goldwind Science and Technology Innovation Wind Power Equipment Co., Ltd., Beijing 100044, China)

  • Hongqi Liu

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

  • Shifu Zhang

    (Beijing Goldwind Science and Technology Innovation Wind Power Equipment Co., Ltd., Beijing 100044, China)

  • Yudi Li

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

Abstract

The PWM voltage pulses output by the inverter reaches the stator winding of the wind turbine generator through the cable. Due to the impedance mismatch between the motor and the cable, the voltage at the motor end rises under the action of the circuit wave process; on the other hand, electromagnetic oscillation occurs within the motor winding. Higher overvoltage is generated under the combined effect of both, which greatly accelerates the aging and breakdown of the insulation layer of the permanent magnet synchronous wind turbine. In this paper, a three-dimensional electromagnetic model of the permanent magnet synchronous wind turbine generator is established. The distribution circuit parameters of the stator winding of the permanent magnet machine are calculated using the finite element method, and its circuit model is based. The voltage distribution of the stator winding under different PWM excitations is investigated by simulation software, and the effects of the time of the rising edge and the pulse width of the PWM pulse on the stator winding voltage to ground and the turn-to-turn voltage distribution are studied. The results show that the effect of the rising edge time is larger when the rising edge time is shorter, the maximum voltage to ground occurs in the first coil, and the amplitude can be up to 1.5 times of the output voltage. When the rising edge time is longer, the maximum voltage to ground occurs in the end coil, and the amplitude is slightly higher than the output voltage. The trend of turn-to-turn voltage variation is similar for different rising edges; only the maximum turn-to-turn voltage amplitude is different. Pulse width has a small effect on overvoltage and only occurs when the pulse width is less than 10 μs. The research results of this paper are of great significance in revealing the aging and breakdown mechanism of the generator stator insulation, as well as the insulation coordination and design.

Suggested Citation

  • Shulin Li & Fuqiang Tian & Haitao He & Hongqi Liu & Shifu Zhang & Yudi Li, 2024. "Investigation on Overvoltage Distribution in Stator Windings of Permanent Magnet Synchronous Wind Turbines," Energies, MDPI, vol. 17(17), pages 1-15, August.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:17:p:4255-:d:1463999
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    References listed on IDEAS

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    1. Artigao, Estefania & Martín-Martínez, Sergio & Honrubia-Escribano, Andrés & Gómez-Lázaro, Emilio, 2018. "Wind turbine reliability: A comprehensive review towards effective condition monitoring development," Applied Energy, Elsevier, vol. 228(C), pages 1569-1583.
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