During the operation of the power system, the increasing impact of power quality issues has brought significant harm to the stability of the power grid operation. In the case of rapid changes in the effective value of voltage, voltage fluctuations occur. The waveform of voltage fluctuations belongs to the amplitude modulation wave of power frequency voltage, so it is necessary to extract the fluctuation signal in order to accurately measure voltage fluctuations and flicker.

At present, the commonly used detection methods for voltage fluctuations are synchronous detection, rectification detection, and effective value detection. When applying synchronous detection and rectification detection, it is necessary to retain the amplitude modulation wave through bandpass filtering, but compared to synchronous detection, rectification detection has certain errors. The detection of voltage flicker is mainly divided into three parts: it needs to be adjusted for voltage input adaptation; Simulating the visual system requires a model;Power quality monitoringThe statistical analysis of the instantaneous flicker visual sensitivity measured.