In the process of power conversion of new energy generation, complex two-stage converter is needed. T-type network inverter is a kind of transformer that can realize three-phase power output from two single-phase output inverters. Functional Topology, the purpose of this paper is to design the circuit topology and controller so that the inverter output voltage meets the power supply requirements. First, the DC power input circuit and transformer structure are designed according to the principle of voltage vector synthesis. Then the controller is designed by state space average modeling method and backstep method. Finally, the system model is built by Matlab/Simulink simulation software. The conversion of 27V DC power to 220V / 50Hz three-phase power for market power supply verified The effectiveness of The design content of this paper.