Abstract: Aiming to realize the control of the output power and current quality of T-type three-level PV grid-connected system when the grid voltage is unbalanced,a control strategy whose DC bus voltage out loop based on PI controller combined with the PV power feed forward and current inner loop based on model predictive controller is proposed in two-phase stationary coordinate system in the paper to achieve the stable output active/reactive power or sinusoidal output current,and a double frequency notch filter is introduced in the voltage outer loop to obtain smooth grid-connected power reference. The simulation results show that the proposed control strategy can be used to separately control or coordinate the double frequency pulsation of active/reactive power and negative sequence current,and the harmonic distortion of the grid current is small and the grid-connected power quality is high when the power grid voltage is asymmetrical,and the T-type three-level inverter neutral point voltage is balanced.