7th Generation IGBT technology enables highest power density stack in solar application

Recently a main trend for solar inverter development is higher power rating and higher power density which can reduce system cost. The state of art technology of IGBT comes into 7th generation, which can increase power rating of IGBT modules around 30% higher compare to last generation. NPC1 topology is widely used in 1500VDC solar inverter to meet cosmic reliability and high efficiency requirements. However this topology need 6 devices in one phase leg which lead to complex control and may have short circuit failure if turn off sequence is not correct. In this paper, a new stack for solar inverter is built using latest IGBT technologies and NPC2 topology to realize highest power density. 2.3kV voltage rating IGBTs are selected in this stack to solve cosmic failure issue in NPC2 topology. The max power rating of this stack can reach 2MW through electrical and thermal test. In this paper, a new stack for solar inverter is built using latest IGBT technologies and NPC2 topology to realize highest power density. 2.3kV voltage rating IGBTs are selected in this stack to solve cosmic failure issue in NPC2 topology. The max power rating of this stack can reach 2MW through electrical and thermal test.