Quasi-Z-source inverter based on fractional order low-frequency ripple suppression

The invention relates to the technical field of photovoltaic power generation, in particular to a quasi-Z-source inverter based on fractional order low-frequency ripple suppression. The inverter comprises a quasi-Z-source inverter circuit and a fractional order decoupling circuit, wherein the quasi-Z-source inverter circuit is used for boosting and inverting an input power supply; and the fractional order decoupling circuit and the quasi-Z-source inverter circuit are connected in parallel at a P node and an N node, and a plurality of low-frequency power pulsation at the direct current side of the quasi-Z-source inverter circuit is eliminated through a closed-loop control strategy. A fractional order decoupling circuit is introduced into a traditional quasi-Z-source inversion circuit through a decoupling switch, so that a plurality of low-frequency harmonics in the quasi-Z-source inversion process can be suppressed; when the decoupling switch is switched off, the traditional quasi-Z-source inverter circuit ope