电力信号同步采样算法

在运用离散傅里叶变换(DFT)做信号的谐波分析中,信号采样的同步有着重要地位。文中运用软件无线电中精细频率估计的方法估计离散电力信号的频率,在得到信号频率的基础上让信号与Farrow滤波器进行卷积运算即可实现采样速率转换。同时把Farrow滤波器系数保存成表格形式,在采样速率转换中直接查表得到系数进行运算,在保证信号采样率转换效果不降低的同时,简化了计算量。仿真分析和实践验证了这个算法的可行性和有效性,该算法可以应用于各种电力配电系统装置的前端处理中的电力信号的同步采样。

Synchronous Sampling Algorithm for Power Signal

Synchronous sampling plays an important role in the use of discrete Fourier transform(DFT) to do the harmonic analysis of the signal.In this paper,the fine frequency estimation method of software radio was used to estimate the frequency of discrete electrical signals.Then,the sampling rate conversion can be achieved by convolution operation of the signal and the Farrow filter.Farrow filter coefficients are saved into a table format,and the sampling rate conversion coefficients can be obtained in the direct table look-up.This algorithm can not only ensure the effect of sampling rate conversion,but also simplify the calculation.The simulation and practice validate the feasibility and effectiveness of this algorithm.The algorithm can be applied to the synchronous sampling of power signal for the front-end processing of various devices in power distribution system.