电力数据采集终端中滤波方法研究

Application of Filtering Technology in PowerData Acquisition Terminal

在电力数据采集终端中滤波器常用来滤除耦合在电力信号传输线路上的高频谐波、抑制干扰,以确保有效地采集电力线上的电压和电流信号,提高系统的采样精度.本文提出一种新的混合滤波方案,即采用二阶压控电压源低通滤波电路的硬件滤波和去极值平均滤波与维纳滤波相结合的数字滤波方案,采用硬件滤波滤除采集信号中的高频分量,通过软件滤波抑制低频分量中的干扰.实验结果表明,这种方案可行且能达到预期的效果.

In order to ensure the data of input voltage and current signals sampled effectively and improve the sampling accuracy of the system, filter is used to filter the high frequency harmonic coupled on electrical signal transmission lines and suppress the interference in intelligent data acquisition terminal. This paper presents a scheme using second-order voltage controlled low-pass filtering circuit and combining limitering average filtering with Wiener filtering, with filtering circuit filtering tile high-frequency components, and digital filter suppressing the interference in low-frequency components. The test results show that the scheme is effective and can achieve the desire results.