Calculation of Three-Phase Voltage Fluctuation

An accurate computation algorithm has been presented in this paper to calculate the voltage fluctuation components of three-phase circuits. Three voltage vectors have been used and compared. After the voltage waveforms of three-phase circuits have been recorded, the voltage vectors are calculated. The jump-sampling approach is used to reduce data size for flicker calculation. Finally, the fast Fourier transform is used to obtain the voltage fluctuation components. The effects of harmonics and power frequency shifting are investigated. The calculation ability of this approach is valuable. Some given waveforms with voltage fluctuation disturbances are used to show the goodness of this approach. From the results, this approach is not influenced by harmonics or power frequency shifting, but also has satisfied accuracy. In general, the three-phase voltage fluctuation is equal to radic3 times of the average value of three phases. This approach provides a good method to track voltage fluctuation values of a three-phase system