On analyzing the mathematical law followed by low-frequency oscillation,a recursive equation is put forward and then simplified with Taylor series expansion.

• 该算法运用了非线性回归法,首先分析了低频振荡波形遵循的数学规律,提出合适的回归方程,并通过泰勒展开法,将该回归方程进行简化,再等间隔抽取N个采集点进行回归计算,求出回归方程系数,减少了运算量;