摘要
该文提出了一种新型的可以用来检测电网中谐波状况的智能三相谐波电能表。为了检测电网中谐波的状况,谐波电能表采用了带AD快速采样和缓存的电能计量芯片ATT7022D。通过对交流电压或电流的快速采样,DSP利用快速傅里叶变换(FFT)实现了对电网中谐波状况的检测。但实验发现由于电网频率的波动,谐波电能表的检测结果会出现一定的偏差。该文在对电网谐波的分析中引入了一次插值,实验证明,利用一次插值的快速傅里叶变换可以很好地实现对电网谐波状况的准确检测。
A new smart type of three-phase harmonic power meter which can be used to detect the state of harmonic of grid was introduced in this paper. Rapid sampling of AD chip and ATIT022D were used in the harmonic energy meter to detect the situation of harmonic grid. By fast sampling the AC voltage or current,using detection of grid harmonic condition has been fulfilled with fast Fourier transform（FFT）in DSP. The results of testing harmonic energy meter were found some deviation due to fluctuations of frequency in grid. In this paper,the first degree interpolation was introduced in analysis of harmonic grid,and it was proved by the experiment that accurate detection of the har- monic situation can be very good to achieve with the use of a fast Fourier transform interpolated.
出处
《自动化与仪表》
北大核心
2012年第8期30-33,共4页
Automation & Instrumentation
