In order to improve the dynamic characteristic of PV grid-connected inverter,a single-phase PV grid-connected inverter system with two-stage structure was designed according to the mathematical model of the inverter and double integral sliding mode control.The PI control is used in the pre-stage to achieve the voltage boost and voltage stabilization,the sliding mode control is used in the backward-stage to realize the grid connection of the inverter.The theoretical derivation of the sliding mode in the inve...