Non-sinusoidal harmonic signal detection method for energy meter measurement

Abstract

With the wide application of electronic devices, harmonic pollution in power field is becoming more and more serious, non-sinusoidal harmonics is the most important influencing factor. In the process of detecting non-sinusoidal harmonic signal, there exists the problem of relatively large error of frequency measurement. The non-sinusoidal harmonic extraction method was optimized to remove the noise part. According to the change of power supply network and the distribution of non-sinusoidal harmonic pollution sources, the signal reconstruction model was constructed by using electricity meter measurement, and the signal detection mode was set by using wavelet transform. Experimental results: The mean relative errors of frequency measurement between the non-sinusoidal harmonic signal detection method in this paper and the other two detection methods are respectively 0.0260, 0.0316 and 0.0322, which proves that the performance of the non-sinusoidal harmonic signal detection method designed has been improved after combining with the metering method of electricity meter.