风电叶片疲劳加载激振系统解耦控制算法及试验研究

发布时间：2018-06-27 03:30

本文选题：风电叶片 + 激振系统　；参考：《工程科学与技术》2017年01期

【摘要】：风电叶片逐渐向大型化方向发展,为了提高大型风电叶片疲劳试验的激振能力、缩短测试周期,两激振源联振已成为疲劳测试方法中具有前景的发展方向。首先进行两激振源的耦合特性试验,设计了激振源转速、相位和叶片振幅的测试方案。当2个激振源初始转速设定为35 r/min时,风电叶片在该激振源作用下进行试验,得出2个激振源转速差在±5 r/min范围内波动、相位也存在耦合现象,叶片振幅变化絮乱。为了提高两激振源的同步效果,在分析现有控制策略的基础上,采用并联交叉耦合结构,开发了滑模变结构同步控制算法,并利用李雅普诺夫函数证明了该算法的渐近稳定性。最后,搭建了一套10 MW级大型风电叶片疲劳试验平台,开发了基于分布式网络总线的疲劳激振控制系统,将该滑膜变结构控制算法应用于aeroblade 2.0~54.38风电叶片两点激振试验。试验结果表明,在两激振源转速均为35 r/min时,两激振源的转动步调一致,相位也能基本保持同步,此时叶片振幅最大,且非常稳定。在不同的初始速度驱动下,分别设定为40和30 r/min,2个激振源的转速均能快速跟随并分别保持。由于两者转速不一致,导致叶片振幅发生波动。上述试验结果表明,虽然2个激振源之间的机电耦合是固有存在的,但是设计的滑模变结构控制算法能使2个激振源的转速、相位步调一致,具有良好的鲁棒特性,有效地保证了疲劳试验的顺利进行。
[Abstract]:Wind turbine blades are gradually developing towards large scale. In order to improve the excitation ability of large scale wind turbine blades and shorten the test period, the combined vibration of two exciting sources has become a promising developing direction in fatigue testing methods. First, the coupling characteristics of the two exciting sources are tested, and the measurement scheme of the rotating speed, phase and blade amplitude of the exciting source is designed. When the initial speed of the two exciting sources is set at 35 r/min, the wind turbine blade is tested under the action of the excitation source. The results show that the speed difference of the two exciting sources fluctuates in the range of 卤5 r/min, the phase also exists coupling phenomenon, and the variation of the blade amplitude is chaotic. In order to improve the synchronization effect of the two excitation sources, a sliding mode variable structure synchronization control algorithm is developed based on the analysis of the existing control strategies and the parallel cross coupling structure. The asymptotic stability of the algorithm is proved by using Lyapunov function. Finally, a fatigue test platform of 10 MW large-scale wind turbine blade is built, and the fatigue excitation control system based on distributed network bus is developed. The synovial variable structure control algorithm is applied to the two-point excitation test of aeroblade 2.0 ~ 54.38 wind power blade. The experimental results show that when the rotational speed of the two exciting sources is both 35 r/min, the rotation of the two exciting sources is consistent and the phase can be kept in sync basically. The amplitude of the blade is the largest and the blade is very stable. At different initial speeds, the speed of the two exciting sources can be quickly followed and maintained at 40 and 30 r / min, respectively. Because of the inconsistency of the two rotational speed, the amplitude of the blade fluctuates. The experimental results show that although the electromechanical coupling between the two exciting sources is inherent, the sliding mode variable structure control algorithm can make the speed and phase of the two exciting sources consistent and have good robustness. The fatigue test is carried out successfully.
【作者单位】：山东理工大学机械工程学院;
【基金】：国家自然科学基金资助项目(51405275) 山东省自然科学基金资助项目(ZR2016EEM20)
【分类号】：TM315

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