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A Method of Conforming Feature Extraction in Non - Invasive Load Monitoring

Aiming at the poor performance of traditional Non-Invasive Load Monitoring (NILM) method in power load identification[1], a feature extraction method based on load power and currents harmonic is proposed. This method adopts the phase-locked loop[2] technology to ensure the consistency between the extracted features data and the original sampling data. And considering a single load of different working modes or multiple loads with different working state as different sub-categories, the currents amplitude of different-frequency and load power are extracted by Fourier transform and coordinate transformation, different weight factors are given to the characteristic quantity of different identification, and labels are given to different electrical loads to improve the load identification accuracy rate.