Control method for restraining oscillate based on mixed electric power filter

This invention discloses a control method for oscillation suppression based on composite power filter, which introduces APF into PPF to compose composite PF system with compensation performance improved greatly and achieved nation standard. Wherein, arranging inductance La in series with APF to compose current source for harmonic wave and interval harmonic wave and make harmonic compositions in load current flow into composite filter system and interval harmonic compositions flow into power network side, which will bring amplification or resonance, decrease APF capacity. The invention improves greatly harmonic wave compensation effect and reliability for existing PPF device.