US EPA

7044241 

Journal Article 

Design of NPC1 power stack beyond megawatt for 1500V solar inverter application 

Hao, Xin; Ma, Kwai; Zhao, Jia; Sun, XinYu; , 

2017 

IEEE 

NEW YORK 

1155-1161 

WOS:000426696300203 

The latest trend in solar inverter application is to increase DC link voltage to 1500VDC for high power output. This paper describes a design concept of NPC1 power stack for 1500VDC megawatt level solar inverter. This stack uses three latest half-bridge IGBT modules with highest power density and operation junction temperature, which enable realization of power level beyond 1MW without paralleling. Critical design concept on loop inductance is explained. Dynamic characteristics are verified by double-pulse test. Thermal characteristics and output power limits are verified by thermal test. Temperature-sensitive component on PCB as output power constraint is identified. Different PCB repositioning solutions are tested to give the overall output power thermal derating curves, which enable output power of 1.15MW at TA= 55 degrees C with 15 degrees C thermal margin. The power stack characteristic and performance change under different thermal environment is further analyzed. 

3rd IEEE International Future Energy Electronics Conference and ECCE Asia 

Kaohsiung, TAIWAN