Abstract Blade pitch control (BPC) is an indispensable part of a variable speed wind turbine, which maintains a stable power output by adjusting the blade pitch angle to adapt to the changing inflow speed introduced by the platform pitching motion (PPM). An integrated aeroelastic-servo transmission system of a floating offshore wind turbine (FOWT) is established and validated. Comparing with existing models, our model considers the effect of the BPC on the FOWT, apart from the dynamic characteristic of the drivetrain and the aeroelastic coupling of the blade. Firstly, dynamic behaviours of the FOWT under different tip speed ratios are compared. Then the performance of FOWT with and without the BPC influence is compared, followed by a dynamic analysis of the FOWT under a varying platform pitching amplitude. Results show that the tip speed ratio slightly alters the FOWT performance under the PPM. Considering the effect of the BPC, the fluctuation of the generator power reduce, but the aerodynamic thrust tends to enlarge the PPM. The non-torque loads induced by the PPM are insensitive to BPC. Fluctuation of the system response increases with increasing platform pitching amplitude.

中文翻译：

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平台俯仰运动下叶片变桨距控制对浮式海上风机动力特性的影响

摘要 叶片变桨控制（BPC）是变速风力发电机组不可缺少的组成部分，它通过调整叶片变桨角以适应平台变桨运动（PPM）引入的流入速度变化来保持稳定的功率输出。建立并验证了浮动式海上风力涡轮机（FOWT）的集成气动弹性伺服传动系统。与现有模型相比，我们的模型除了传动系统的动态特性和叶片的气动弹性耦合外，还考虑了 BPC 对 FOWT 的影响。首先，比较了不同叶尖速比下 FOWT 的动态行为。然后比较了有和没有 BPC 影响的 FOWT 的性能，然后对不同平台俯仰幅度下的 FOWT 进行了动态分析。结果表明，叶尖速度比略微改变了 PPM 下的 FOWT 性能。考虑到 BPC 的影响，发电机功率的波动减小，但气动推力有增大 PPM 的趋势。PPM 引起的非扭矩负载对 BPC 不敏感。系统响应的波动随着平台俯仰幅度的增加而增加。