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Study on frequency detection based on wavelet transform and three-point algorithm
Pages: 65-70
Year: Issue:  2
Journal: Electric Machines and Control

Keyword:  frequency detectionthree-point algorithmerror analysiswavelet transformasynchronous sampling;
Abstract: 小波变换可以在非同步交流采样情况下,提取畸变信号中的基波分量,但检测结果存在少许误差.三点法可通过任意三个等间隔检测点提取正弦信号频率,但检测点误差会严重影响测频精度.对三点法误差的数学机理进行分析发现,合理的选择检测点之间的间隔可以使结果误差最小.极值分析和牛顿迭代法可被用来近似计算最优检测点间隔.通过误差的抑制和个别较大误差结果的剔除,小波变换能与三点法结合对电网中畸变信号的基波频率进行高精度...
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