双馈风电机组电气故障扰动引起的电磁转矩波动易造成轴系传动链扭振疲劳,有必要研究电网短路故障对机组传动链扭振疲劳可靠性的影响。首先建立考虑关键部件柔性的传动链有限元模型,通过模态分析获取传动扭振模态。其次基于集中质量法,建立机电耦合模型,以电网短路故障为扰动因素,仿真分析电网短路故障下电磁转矩动态响应。最后将电网短路故障下发电机电磁转矩扰动作为激励,借助ANSYS Designlife平台构建传动链扭振疲劳可靠性模型,分析机组传动链在电网短路故障下电磁转矩波动对扭振疲劳可靠性的影响。结果表明：三相接地故障时电磁转矩波动最剧烈,对传动链的疲劳可靠性影响更大;电网发生短路故障时,电磁转矩中存在低频分量可与高速轴的扭振模态耦合,激发高速轴的扭振,加剧高速轴的疲劳损伤;电磁转矩激发的扭振具有传递效应,越靠近发电机的部件扭振越明显,可靠性越低。
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.
关键词
风电机组 /
传动链 /
双馈 /
扭振 /
有限元 /
疲劳寿命 /
可靠性
Key words
wind turbines /
drivetrain /
doubly-fed /
torsional /
finite element /
fatigue life /
reliability
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