电量测量抗混叠滤波器设计与研究

在电力谐波分析中,为了最大程度地抑制或消除频谱混叠对动态测控系统的影响,必须采用抗混叠滤波器。分析基于DSP电力谐波分析系统中产生频谱混叠的原因,介绍单一采样频率下模拟滤波器设计过程,为了降低对单一采样频率下模拟滤波器技术要求,又介绍采用过采样技术与∑-△式A/D转换器设计的模拟滤波器以及数字滤波器,取得了较好的抗混叠滤波效果。最后,从实际应用出发,给出由RC-运放和集成滤波实现高阶巴特沃斯抗混叠滤波器电路及其参数选择,具有一定实际应用价值.

Design of Anti-aljasing Filter for AC Power Electrical Parameter Measurement System

In the harmonic analysis of electrical power,in order to maximize the suppressionor elimination of spectrum aliasing effect on the measurement and control system, anti-aliasing filter must be used. This paper analyzed aliasing causes in the harmonic analysis systemof electrical power DSP - based system. It introduced a single sampling frequency analog filter design process, and in order to reduce the technical requirements of a single sampling frequency analog filters, the paper also presented the use of over-sampling technique and ∑-△ type of A/D converter designing analog filter and digital filter, which achieved a better anti-aliasing filtering. For practical purpose, this paper puts hight-ranking Butterworth antialiasing circuits made up of RC_amplifier and integrated filter and the choices of its parameters, which have certain values in practical application.