基于TMS320C6713DSP的IEC电压闪变仪

摘要

In order to measure voltage flicker accurately, the IEC flickermeter with 400 Hz sampling rate was designed on TMS320C6713 digital signal processor (DSP), according to function and design specification of flickermeter recommended by IEC. And according to calibration standard of IEC flickermeter given by IEC, several calibration results of rectangular fluctuation signal were given. The effect of harmonic and white noise on accuracy of IEC flickermeter was also analyzed. To reduce the white noise' s influence, wavelet threshold denoising was applied. The calibration results show that IEC flickermeter based on TMS320C6713 DSP is accurate, the analysis results show that white noise will influence the accuracy of the flickermeter rather than harmonic, the calculation results show that the accuracy of the flickermeter is improved significantly.%为实现电压闪变的精确测量,按照国际电工委员会(IEC)推荐的电压闪变仪功能和设计规范,在TMS320C6713数字信号处理器(DSP)平台上设计了采样率为400 Hz的IEC电压闪变仪,并按照IEC给出的电压闪变仪的校验标准,采用多个矩形波动信号进行了闪变值的校验,分析了电网谐波和白噪声对IEC电压闪变仪计算结果的影响,最后,针对白噪声干扰问题,提出了小波阈值去噪的方法,对输入信号进行去噪,校验结果表明基于TMS320C6713 DSP的IEC电压闪变仪测量结果较为准确.研究结果表明电网白噪声对闪变仪的精度干扰较大,电网谐波几乎无影响；经小波阈值去噪后,电压闪变仪的测量精度得到了显著提高.