Reliability Assessment of Transformerless PV Inverters considering Mission Profiles

Table 1

Thermal impedance parameters of power switching devices from a leading manufacturer according to Figure 6.

Impedance
	1	2	3	4
IGBT
(K/W)	0.074	0.173	0.526	0.527
(s)	0.0005	0.005	0.05	0.2
Diode
(K/W)	0.123	0.264	0.594	0.468
(s)	0.0005	0.005	0.05	0.2