Load reduction for two-bladed horizontal-axis tidal current turbines based on individual pitch control
Load reduction for two-bladed horizontal-axis tidal current turbines based on individual pitch control
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DOI：
10.1016/j.oceaneng.2020.107183
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发表时间：
2020-07
影响因子：
5
通讯作者：
Hongwei Liu;Li Yangjian;Yong-gang Lin;Wei Li;Gu Yajing-
中科院分区：
文献类型：
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作者：
Hongwei Liu;Li Yangjian;Yong-gang Lin;Wei Li;Gu Yajing-
随着潮流能的大幅度发展，潮流涡轮机（TCT）转子的尺寸不断增大，不对称载荷也随之增大。在这项研究中，严重的不对称负载进行了调查的海试实验与600千瓦的双叶水平轴TCT。已经推荐并验证了独立变桨控制（IPC）对载荷减小是有效的。在IPC过程中，每个叶片都被单独主动控制，以补偿旋转周期内的不对称负载。IPC具有重要的工程意义，但在低于额定条件下可能导致部分能量损失。然而，传统的IPC方法对于双叶片涡轮机具有局限性。因此，本文提出了一种新的基于矢量分析的IPC方法，以减轻双叶涡轮增压器的疲劳载荷。为了消除由信号滤波器和执行器引起的相位滞后，设计了积分滑模控制器。为了验证所提出的滑模控制策略的可行性并研究其性能，利用GH-Bladed和Simulink进行了协同仿真。比较仿真结果表明，所提出的IPC方法的可行性和更好的性能相比，传统的PI控制器的SMC控制器。
With the large progress in tidal current energy, the size of tidal current turbine (TCT) rotors has increased, leading to more substantial asymmetrical loads. In this study, severe asymmetrical loads were investigated by a sea trial experiment with a 600-kW two-bladed horizontal-axis TCT. Individual pitch control (IPC) has been recommended and validated to be effective for load reductions. Each blade is individually and actively controlled during IPC to compensate for asymmetrical loads within the rotational cycle. IPC has significant engineering implications but may cause partial energy loss under below-rated conditions. However, the conventional IPC method has limitations for two-bladed turbines. Thus, to alleviate the fatigue loads of two-bladed TCTs, a new IPC method based on vector analysis is presented in this paper. An integral sliding mode controller is designed for the proposed IPC to eliminate the phase lag resulting from the signal filter and actuator. To validate the feasibility and investigate the performance of the proposed sliding mode control (SMC) strategy, a collaborative simulation using GH-Bladed and Simulink was carried out. The comparative simulation results demonstrated the feasibility of the proposed IPC method and the better performance of the proposed SMC controller compared with a conventional PI controller.