To solve the problems of nonlinear load electrical energy measurement inaccurate using traditional decomposition and reconstruction wavelet algorithm under the condition of distorted signal

the article presents a distortion electrical energy measurement method based on optimal multiwavelet. First

a simplified mathematical model of power grid was established and the mathematical description of power signal and electrical measure method were given. Then

according to the specific relationship of the signal energy value and characteristics

the information entropy evaluation indicators of the fundamental section and distortion section were calculated and to determine the optimal decomposition of wavelet of the fundamental sections and distortion section of the signal. Finally

ac- cording to the reasonable electricity measurement method calculate the consumption power of impact and harmonic load. The simulation results show that the electrical measuring accuracy of the nonlinear load is higher than the traditional method

application of the information entropy of evaluation index selection signal of fundamental section and distortion section respectively the optimal wavelet.