Harmonic suppression apparatus, method, control unit, electrical appliance, and storage medium

A harmonic suppression apparatus, comprising:

• a tuning circuit module, which is connected with a first live wire and a second live wire of a three-phase power supply and is configured to perform resonance regulation processing on a first-phase current inputted through the first live wire and a second-phase current inputted through the second live wire;
• a PI-type resonant filtering circuit module, which is respectively connected with the tuning circuit module and a third live wire of the three-phase power supply and is configured to perform harmonic filtering processing on the first-phase current and the second-phase current processed by the tuning circuit module and a third-phase current inputted through a third live wire;
• and
• a rectification circuit module, which is connected with the PI-type resonant filtering circuit module and is configured to perform rectification progressing on the first-phase current, the second-phase current and the third-phase current processed by the PI-type resonant filtering circuit module, to obtain a direct current and output the direct current through a direct current output bus for powering a load.