A method and device for identifying electrical safety hazards in new grid-connected main bodies

Abstract

This invention discloses a method and apparatus for identifying electrical safety hazards in new grid-connected systems. The method includes: acquiring waveform data of voltage and current during the operation of the new grid-connected system; generating differential signals of voltage and current through differential processing of the waveform data; constructing voltage-current coupling trajectory features based on the differential signals; extracting time-frequency energy texture features through multi-scale time-frequency analysis of the waveform data; fusing the voltage-current coupling trajectory features and the time-frequency energy texture features to generate a joint criterion; and identifying and determining the status of electrical safety hazards in the new grid-connected system based on the joint criterion. This invention aims to improve the completeness and accuracy of hazard characterization, enhance the ability to depict non-steady-state spectral behavior, harmonic and interharmonic evolution characteristics, thereby improving the stability and robustness of electrical safety hazard identification results under complex operating conditions.

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