A Novel Hybrid T-Type Three-Level Inverter Based on SVPWM for PV Application

Table 3

Similarities and differences of diode clamped and T-type three-level circuit topologies.

Compared items	Diode clamped three-level inverter	T-type three-level inverter
Switch pressure	Sa1~Sa4: 0.5 UPV	Sa1/Sa2: Upv; Sa3/Sa4: 0.5 Upv
Commutation path	Long commutation path and short commutation path	All paths are consistent
Efficiency	The higher switching frequency (>16 kHZ) increases efficiency	The lower switching frequency (<16 kHZ) increases efficiency
Modulation strategy	Traditional control strategy of current PI loop	Traditional control strategy of current PI loop
Number of components	4 switches plus 2 diodes	4 switches
Drive power	4 groups	3 groups