Abstract:

Abstract:At present，the technology of sixpulse rectifier are used in the most of highpower rectifying equipment in the high energy consuming industry in our country, but the sixpulse rectifier has low power factor and high current harmonic in condition of low load rate. The theoretical calculation of power factor and harmonic analysis were done for the sixpulse rectifier and the SVPWM rectifier under different load rate, and simulation of the two rectifiers was carried out by Matlab. Combining with the practical measured data of the power conversion devices
provided by the manufactures, it was verified that in low load rate condition, comparing with the sixpulse rectifier,the power factor of SVPWM rectifier is higher, and its harmonic pollution on powr grid is lower too.

Key words: Keywords:sixpulse rectifier, SVPWM rectifier, load rate, total harmonic distortion, power factor