A wavelet transform power harmonic detection method based on DSP

To improve the accuracy of power harmonics detect, a power harmonic detection method based on DSP and a pair of A/D is provided in the paper. Wavelet transform has been widely used in the analysis of power system as a method to analyze digital signals, this paper adopt coefficient dissociation with the wavelet packet transform express harmonic current and voltage values etc., the power harmonics detect device can send data to a PC through DSP interface, program by mixing VC++ and LabVIEW, and achieve real-time power harmonics detect. The experiment results show that the wavelet packet transform can analyze the local characteristics of the signal more accurately, and improve the harmonic analysis of real-time and accuracy.