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电网技术  2011 

采用极值搜索法的风电机组最大风能追踪控制

, PP. 171-176

Keywords: 风电机组,最大风能追踪,极值搜索法,柔化控制

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Abstract:

针对风电机组额定风速以下最大风能追踪控制问题,采用极值搜索的方法,通过对叠加风速扰动的叶尖速比和功率系数进行傅里叶变换,获得相位差信息,确定叶尖速比的变化方向。采用S形传输函数给出叶尖速比的变化量,降低了控制量的变化幅度,柔化了控制作用,进而控制转速跟踪最佳叶尖速比,使运行点向最佳运行点移动。通过对某6kW风电机组在额定风速以下进行仿真研究发现,该方法不需要了解风电机组精确的参数和数学模型,能够控制风力机转速较好地跟踪风速变化,保持最佳叶尖速比和最大功率系数,减小功率动态跟踪误差,在实现最大风能捕获的同时,降低机组机械载荷。

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