合并单元插值滤波算法研究

Research on interpolation filter algorithm of merging unit

合并单元主要用于采样数据,插值同步多源数据。本文深入分析了合并单元滤波插值算法,采用一种模拟滤波和数字滤波相结合的滤波方式,并根据滤波插值算法产生的误差,设计了一种采样频率为4/4.8kHz且满足检测规范要求的插值滤波方案。通过Matlab仿真计算表明该方案较好地解决了频率混叠问题,稳态误差满足电力系统对合并单元的要求。

Merging unit is mainly used for sampling data and synchronizing multi-source data by interpolation.In this paper,interpolation filter algorithmog of merging unit is deeply analyzed.A filter method combined with analog filter and digital filter is adopted,and an interpolation filter scheme with a sampling frequency of 4/4.8kHz and satisfying the requirements of the detection specification is designed according to the error generated by the interpolation filter alglorithm.The simulation results through Matlab show that the scheme solves the problem of requency aliasing better,and steady-state error meets the requirement of power system for merging unit.