准同步谐波分析的DSP实现

介绍一种DSP准同步谐波分析系统。系统硬件选用主从式双处理器结构,主处理器(单片机)负责人机交互及DSP的Bootloader等,从处理器(DSP芯片)专门负责数据处理;软件采用定点机浮点化运算,自定义浮点类型简化运算,提高运算速度和有效位数,系统在谐波分析中利用准同步算法,提高非正弦周期信号非同步采样情况下电网参数运算的准确度。系统成功应用于光电式高压计量装置,通过仿真试验,基波准确度优于0.1%,11次以下的谐波准确度优于2%。具有良好的实用价值和拓展性能。

Quasi-synchronous harmonic analysis system based on DSP

This paper introduces a system of harmonic analysis,which applies quasi-synchronous sampling arithmetic and DSP.Two processors is used in the system.The main processor(MCU) is for man-machine interface and the bootloader of DSP.The coprocessor(DSP) achieves data processing.By defining float data on fixed-point DSP,accuracy is improved.And with application of quasi-synchronous sampling arithmetic,high precision harmonic analysis is realized when there would be a non-synchronization between the sampling period and the signal period.The system has been applied in optoelectronic high-voltage measurement set.The accuracy of fundamental wave and harmonic wave(3rd-11th) is better than 0.1% and 2%.The system has practical value and expansibility.