基于虚拟仪器的谐波检测研究

介绍了基于离散傅里叶变换数字滤波器以及基于重采样理论和均值数字滤波器的瞬时谐波检测方法。运用Manab软件对两种方法进行了仿真研究，结果表明两者既保留了数字滤波器的准确性，又解决了数字滤波器跟随性和实时性差的问题。应用LabVIEW软件和数据采集卡在PC机上对两种谐波检测系统的动态性能进行实验，验证了仿真结果的正确性。还采用快速傅里叶变换的谐波测量方法，在LabVIEW软件平台上开发了虚拟谐波测量仪，为谐波分析与谐波抑制提供了依据。

Research of harmonic measuring based on virtual instrument

Two new instantaneous harmonic current measuring methods are introduced,they are the method based on DFT(Discrete Fourier Transform) digital filter and the method based on re-sampling theory and digital mean filter. Both are simulated with Matlab,and results show that the following and real-time performances of digital filter are improved while the veracity is kept. The dynamic performances of both methods are experimented on personal computer with LabVIEW and data acquisition card,which verifies the correctness of the simulative results. Applying the harmonic measuring method based on fast Fourier transform,a virtual harmonic measuring instrument is designed in LabVIEW environment. It may be used in harmonic analysis and suppression.