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首页> 外文期刊>Electric power systems research >Long-term fatigue life loss of turbine blades owing to noncharacteristic harmonic currents in asynchronous HVDC links
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Long-term fatigue life loss of turbine blades owing to noncharacteristic harmonic currents in asynchronous HVDC links

机译：异步HVDC链路中由于非特性谐波电流而导致的涡轮叶片长期疲劳寿命损失

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摘要

The long-term effect of noncharacteristic harmonic currents in asynchronous HVDC links on fatigue life expenditure in turbine -generator blades is studied in this paper. Because the frequencies of the two main harmonic current terms are subsynchronous and offer a probability distribution due to the asynchronous operation in a HVDC link, a systematic fatigue estimation approach was devised to investigate the long-term impact for the low-pressure turbine blades. From the simulation results, it is clear that the sustained excitation of these harmonics becomes a cause of blade failure even though the harmonic current is still normal for only one generator connected to the inverter station bus. By the effect analysis of uncertainty in electrical and mechanical parameters, several schemes for the fatigue loss alleviation were then found.
机译：本文研究了异步高压直流输电线路中非特征谐波电流对汽轮发电机叶片疲劳寿命的长期影响。由于两个主要谐波电流项的频率是次同步的，并且由于HVDC链路中的异步操作而提供了概率分布，因此设计了系统的疲劳估计方法来研究对低压涡轮叶片的长期影响。从仿真结果可以清楚地看到，即使仅对连接到逆变器站总线的一台发电机的谐波电流仍然正常，这些谐波的持续激励仍会导致叶片故障。通过对电气和机械参数不确定性的影响分析，找到了几种缓解疲劳损耗的方案。

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