一种基于DSP的高精度谐波检测改进方案设计

介绍了一种基于同步旋转坐标系的以DSP为核心的数模混合型谐波检测设计方案。针对常规方案的缺陷提出了改进信号流的新方案。它有效地整合了模拟和数字的优势，基于低速率采样的低通滤波器解决了DSP字长和精度的矛盾，并针对数字系统的时间延迟提出了补偿策略。实验结果表明，该方案硬件简单、成本低，可实现高精度、无延迟的谐波检测。

Improved Design Scheme of High Accuracy Harmonic Detection based on DSP

This paper presents an improved high accuracy harmonic detection system based on DSP for active power filter.Based on synchronous reference frame,the control is mixed and the core is a digital signal processor(TMS320F240).A modification strategy adopting new signal-flow during the harmonic detection is introduced,which can effectively integrate analog control with digital control.Phase compensation strategy is used to eliminate time delay.To overcome the controversy of limited DSP performance and accurate fundamental component extraction,low sample-rate scheme is adopt for digital low pass filter design.Experimental results show that the modified system can detect power harmonic delaylessly and accurately. It also has good dynamic performance.