In recent years

three-level neutral point clamped rectifier has been widely used in various fields

with the rise of the “Photovoltaic-Storage-Charge” triad micro-grid system

the independent and stable control of the voltage of the upper and lower DC sides as well as the power of the loads of it has become more and more critical. In view of the above requirements

a general control method for dual-load T-type three-level rectifier is proposed. Firstly

based on the carrier-based pulse-width-modulation method

the relationship between DC zero-sequence voltage injection and power distribution of the upper and lower DC sides of the dual-load T-type three-level rectifier is analyzed

and the power decoupling control method is given. Secondly

this paper analyzes and plots the limits of the average-power-ratios of the upper and lower DC sides under different modulation regimes

and caculates the instantaneous component of the zero-sequence voltage according to the control target of constant instantaneous power of the upper and lower DC sides to suppress the voltage fluctuation of the capacitance on the DC side. Finally

the feasibility and effectiveness of the above method are verified by experiments.