TORSIONAL FATIGUE RELIABILITY ANALYSIS OF DOUBLY-FED WIND TURBINE DRIVETRAIN UNDER POWER GRID WITH SHORT CIRCUIT FAULT

Qiu Shilong; Li Hui; Gong Lijiao; Wang Bin; Chai Zhaosen; Si Jindong

doi:10.19912/j.0254-0096.tynxb.2020-0254

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (2) : 380-388. DOI: 10.19912/j.0254-0096.tynxb.2020-0254

TORSIONAL FATIGUE RELIABILITY ANALYSIS OF DOUBLY-FED WIND TURBINE DRIVETRAIN UNDER POWER GRID WITH SHORT CIRCUIT FAULT

Qiu Shilong¹, Li Hui^1,2, Gong Lijiao¹, Wang Bin^1,3, Chai Zhaosen^1,2, Si Jindong¹

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Abstract

The electromagnetic torque fluctuation caused by the electrical fault disturbance of the doubly-fed wind turbine can easily cause torsional vibration fatigue of the shafting drivetrain. It is necessary to study the influence of grid short-circuit fault on the torsional vibration fatigue reliability of the drivetrain of the unit. Firstly, the finite element model of the drivetrain considering the flexibility of key components was established, and the torsional vibration mode was obtained through modal analysis. Secondly, based on the concentrated mass method, an electromechanical coupling model was established, the short-circuit fault of the power grid was used as the disturbance factor, and the dynamic response of the electromagnetic torque under the short-circuit fault of the power grid was simulated and analyzed. Finally, the electromagnetic torque fluctuations generated by the short circuit fault of the power grid were used as the unbalanced excitation source that causes the torsional vibration of the doubly-fed wind turbine drivetrain, the ANSYS Designlife platform was used to construct a torsional fatigue reliability model for the drivetrain and the influence of electromagnetic torque fluctuations on the torsional fatigue reliability of the drivetrain under grid short circuit faults was analyzed. The results show that the electromagnetic torque fluctuation is the most severe when the three-phase ground fault occurs, which has a greater impact on the fatigue reliability of the drivetrain; When there is a short-circuit fault in the power grid, the low-frequency component of the electromagnetic torque can be coupled with the torsional vibration mode of the high-speed shaft to stimulate the torsional vibration of the high-speed shaft and aggravate the fatigue damage of the high-speed shaft. The torsional vibration excited by electromagnetic torque has a transmission effect, and the closer the components to the generator are, the more pronounced the torsional vibration and the lower the reliability.

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wind turbines / drivetrain / doubly-fed / torsional / finite element / fatigue life / reliability

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Qiu Shilong, Li Hui, Gong Lijiao, Wang Bin, Chai Zhaosen, Si Jindong. TORSIONAL FATIGUE RELIABILITY ANALYSIS OF DOUBLY-FED WIND TURBINE DRIVETRAIN UNDER POWER GRID WITH SHORT CIRCUIT FAULT[J]. Acta Energiae Solaris Sinica. 2022, 43(2): 380-388 https://doi.org/10.19912/j.0254-0096.tynxb.2020-0254

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