基于双CPU电能质量监测仪的谐波分析算法研究

An Arithmetic for Harmonics Analysis Based on Double-CPU Power Quality Monitoring Instrument

采用DSP和ARM双CPU结构是目前电能质量监测仪最普遍的设计方法。本文介绍了一种双CPU的系统结构,重点研究了加窗插值FFT作为谐波分析算法,给出了4项Rife-Vincent(III)窗对应双峰谱线插值法的拟合多项式系数,提出了此算法的实现方法及程序流程图。利用Matlab进行的仿真实验表明:在基波频率变化的情况下,对含有9次谐波信号应用此算法,其计算精确度可达到国标要求。

It is a universal design technique of double-CPU power quality monitoring instrument by ARM and DSP. This paper proposes an architecture based on double CPU, besides, the harmonics analysis algorithm of windowed FFT interpolation is researched, and the parameter of Double-spectrum-line interpolation polynomials are given for 4-term Rife-Vincent （III） window. In addition, a program flow chart is provided along with the realization of the arithmetic. The simulating results show that： in the case of fundamental frequency change, the calculation accuracy can be achieved national standard by using this arithmetic.