This study optimizes the active blade pitching (ABP) motion of a vertical axis wind turbine (VAWT) to increase its power output over a wide range of tip speed ratios (TSRs). The study begins by developing a simplified analytical model to compute the torque output of the VAWT as a function of its ABP. The analytical model is used to generate a preliminary optimal ABP at a single TSR. Next, computational fluid dynamics simulations are employed to develop metamodels of the response of the VAWT. These metamodels are used to determine the final optimal ABP. The optimization procedure is then repeated for different TSRs to determine an optimal ABP as a function of the TSR. The power outputs for the ABP-driven VAWT are compared with those of a fixed blade VAWT at different TSRs. The results indicate a 13% increase in the maximum power output of the VAWT compared to an optimal fixed pitch strategy. The torque outputs of the ABP-driven VAWT are then compared with those of a fixed blade VAWT at low TSRs. The results indicate that ABP would significantly improve the self-starting capability of VAWTs.

中文翻译：

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基于分析和基于CFD的元模型优化垂直轴风力发电机的主动叶片变桨

这项研究优化了垂直轴风力涡轮机（VAWT）的主动叶片变桨（ABP）运动，以在较大的叶尖速比（TSR）范围内增加其功率输出。该研究从开发简化的分析模型开始，以根据VAWT的ABP计算VAWT的扭矩输出。该分析模型用于在单个TSR处生成初步的最佳ABP。接下来，使用计算流体动力学模拟来开发VAWT响应的元模型。这些元模型用于确定最终的最佳ABP。然后针对不同的TSR重复优化过程，以确定最佳ABP作为TSR的函数。将ABP驱动的VAWT的功率输出与固定刀片VAWT在不同TSR的功率输出进行比较。结果表明，与最佳固定螺距策略相比，VAWT的最大功率输出增加了13％。然后将ABP驱动的VAWT的扭矩输出与固定叶片VAWT在低TSR时的扭矩输出进行比较。结果表明，ABP将显着提高VAWT的自启动能力。