Abstract: Aiming at the unobservable region in traditional phase current reconstruction method of neutral current single sensor of T-type three-level inverter,the existence mechanism of the unobservable region of the neutral current sampling proce sses is analyzed firstly,the asymmetric vector pulse width modulation phase current reconstruction strategy is proposed. Through shifting the pulse width modulation wave,eliminate unobservation regions,and realize phase current reconstruction. The experimental results show that the phase current restructuring error proposed method is less than 2.2%,and the THD of three phase current is less than 3.48%.