Single-phase five-level grid-connected inverter and active power decoupling control strategy

The invention discloses a single-phase five-level grid-connected inverter, which comprises an input direct current source, a first half-bridge booster circuit, a bus capacitor, a second half-bridge circuit, an H-bridge inverter circuit and a filter circuit, and is characterized in that the second half-bridge circuit and the H-bridge inverter circuit form a five-level inverter circuit which is connected with a power grid to realize grid connection; the DC source, the first half-bridge boost circuit and the bus capacitor form a boost and decoupling circuit. The invention further provides an active power decoupling control strategy. By designing the controllers of the inverter circuit part and the booster circuit part, the power decoupling of the five-level inverter can be automatically realized, and the topology and control strategy of the five-level inverter realize active power decoupling while realizing multi-level output and boosting, so that the direct-current bus capacitance of the inverter can be reduced