In view of the problems that the traditional diode neutral-point-clamped three-level and five-level inverters require a large number of clamping diodes

complex structure

poor reliability

high switching losses

and capacitor voltage of the traditional Z-source two-level inverter is high

its boost capacity is insufficient

output power is lower

this paper puts forward a new T-type five-level inverter topology. This new topology saves the clamping diodes

simplifies the structure

reduces the switching losses and improves its power level. Secondly

combining the Z-source network and the T-type five-level inverter

we gets a new Z-source T-type five-level inverter; the new inverter reduces the switching device voltage and capacitor voltage effectively at the same voltage gain. Then

its boost capacity gets higher by replacing the inductors of Z-source network with boost units. Finally

we design the modulation strategy with the same direction carrier of the new inverter. The simulation results prove the correctness of the proposed topologies and the effectiveness of the modulation strategy.