An algorithm for calculating power losses due to higher harmonics and interharmonics based on the wavelet transform

This paper presents the modernization of the algorithm for calculating additional power losses in electrical networks in non-sinusoidal non-stationary modes. The mathematical method is the wavelet transform. The difference from the existing methods is the preliminary choice of the optimal wavelet function according to the energy condition of the spectrum of the harmonic group. The paper proposes combining the harmonic and interharmonic groups defined in the regulatory and technical documentation with the bandwidth of the wavelet function. The second determining factor in choosing the optimal wavelet function is the minimum standard deviation of the original and reconstructed signal. The proposed algorithm allows for non-stationary modes to determine the effective values of higher harmonics and interharmonics, as well as the duration of the high-frequency components in the signal. These values are necessary for calculating additional power and energy losses in current-carrying parts. Increasing the accuracy of calculating losses in non-sinusoidal non-stationary modes makes it possible to correct the feasibility studies for introducing devices for filtering higher harmonics and interharmonics.