Abstract
In order to study the accurate measurement of electric energy in complexindustrial field, a method of harmonic electric energy measurement basedon wavelet packet decomposition and reconstruction algorithm, as well asthe calculation formula of harmonic power and the principle of harmonicelectric energy measurement are proposed. Using db42 wavelet function tocarry out harmonic energy metering simulation analysis, the results showthat: The fundamental frequency of the simulation signal is 50 Hz, two-layerwavelet packet transform is adopted, the simulation input signals within 40fundamental wave cycles are taken, and the sampling frequency fs is 800 Hz.Conclusion: The three-phase harmonic energy metering device based onvirtual instrument technology has realized the measurement of each harmonicactive power and reactive power, and the accuracy reaches 0.2 s.
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