Abstract: Aiming at the problem of neutral point voltage fluctuation in T-type three-level inverters, an improved virtual space vector modulation strategy (k-VSVPWM) based on time proportion distribution factor is proposed. This method dynamically adjusts the action time ratio of positive and negative redundant small vectors in the nine-segment time distribution, introduces the time proportion distribution factor, and effectively balances the DC side neutral point potential. In addition, a double closed-loop PI control module of voltage outer loop and current inner loop is constructed to reduce the total harmonic distortion (THD). The results show that the neutral point voltage fluctuation of the proposed k-VSVPWM strategy on the DC side is reduced by about 25% compared with the traditional method, and the output voltage THD value is reduced to 0.37%.