Abstract: Higher switching frequency can suppress low frequency harmonics, but at the same time will introduce a large number of high frequency harmonics. The LCL filter can satisfy the low frequency gain and attenuate the high frequency harmonics, but this filter is a high order system with a resonant peak. In order to solve these problems, a control strategy based on state feedback is proposed. The state observer is used to observe the state variables of the system and the state feedback technique is used to improve the robustness of the system. Furthermore, the control strategy reduces the number of system sensors. The simulation and experimental results show that the control strategy is feasible.