Power factor correcting and converting method and device for eliminating power frequency ripple waves by peak load shifting

The invention discloses a power factor correcting and converting method and device for eliminating power frequency ripple waves by peak load shifting. An extra bidirectional DC/DC (Direct Current/Direct Current) converter is combined with an AC/DC (Alternating Current/Direct Current) single-phase PFC (Power Factor Correction) converter; when an output of the single-phase PFC converter is higher than a reference voltage or a reference current, the bidirectional DC/DC converter is used for storing and absorbing surplus energy to an energy buffering and storing capacitor; when the output of the single-phase PFC converter is lower than the reference voltage or the reference current, the energy of the energy storage capacitor is released to a load; and alternating current ripple wave energy output by the single-phase PFC converter is compensated by the way so that double power frequency ripple waves on a filter at a direct current output end of the single-phase PFC converter are eliminated. According to the method and the device provided by the invention, a power frequency ripple wave voltage or a ripple wave current of a power factor correction converter is eliminated, and the following problems are solved: the cost is high due to utilizing a large-capacity capacitor to reduce the power frequency ripple waves of the power factor correction converter, the efficiency is low due to using a cascaded two-stage converter, and the like.