复杂海况下风力发电机建模与动态特性仿真分析

考虑到海上风力发电机可能会受到冰载荷的影响,将随机冰力函数模型添加到风力发电机模型中,利用莫里森方程模拟海浪作用,建立复杂海况下多体动力学联合仿真模型,进行多场耦合作用下的风力机动力学特性分析,以此评估风力机系统在复杂工况下的运行风险。结果表明:风力机塔顶位移的波动主要受风载的影响;波浪、海冰对塔基载荷性能影响较大,会使塔筒产生持续振动并引发疲劳破坏,风冰联合作用时振动更为剧烈;由于海冰的持续撞击作用会使塔基载荷普遍大于无海冰作用情形,因此,针对海冰工况下风力发电机的设计要有所修正及完善。

Wind turbine modeling and dynamic characteristics simulation analysis under complicate sea conditions

Considering offshore wind turbines may be affected by ice load, random ice force model was added to wind turbine model and wave action was simulated by using Morison equation. In order to assess the risk of wind turbine system operation, multi-body dynamics model was established with sea ice action to conduct dynamic characteristics analysis of wind turbine under multi-field coupling. The results show that tower displacement fluctuations are mainly affected by wind load. Wave or ice can directly impact tower foundation load performance, making tower continuously vibrate and causing fatigue damage. When wind and ice come together, tower vibration becomes more intense. Since sea ice''s continuous strike makes tower foundation load generally greater than that without sea ice case, the design of wind turbine for ice conditions should be corrected and improved.