Study on Time-frequency Hybrid Noise Reduction Method of Low Voltage Power-line signal Based on Reactive Compensation

Abstract

Up to now, existing low-voltage noise reduction algorithms for electric power-line carrier signal usually lead to low signal to noise ratio. Therefore, a time-frequency hybrid noise reduction method for low-voltage power-line signal based on reactive compensation is proposed. The mixed noise characteristics of the low-voltage power-line signal are analyzed, separating the carrier signal into the time domain and the frequency domain, and designing the time-frequency mixing noise reduction algorithm for the carrier signal. Further more, reactive compensation technique is used to handle the pulse noise by the low voltage power-line signal. The high voltage filter compensation device is selected as the reactive compensation equipment and sets reasonable simulation experiment parameters for the carrier signal noise reduction experiment. The experimental results show that compared with the low and high noise environment, the signal to noise ratio is greater than the minimum limit, which fully shows that the proposed method has a good noise reduction effect.