基于SiC MOSFET的储能变流器功率单元关键技术  

Key Technology of Power Unit for Energy Storage Converter Based on SiC MOSFET

作　　者：张海[1] 谢文刚 樊芳芳 刘凯 贾文萱 ZHANG Hai;XIE Wengang;FAN Fangfang;LIU Kai;JIA Wenxuan(State Grid Shanxi Electric Power Company,Taiyuan 034000,China;Shandong Taikai High-Voltage Switchgear Co.,Ltd.,Tai’an,Shandong 271000,China;the State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China)

机构地区：[1]国网山西省电力公司,太原034000 [2]山东泰开高压开关有限公司,山东泰安271000 [3]新能源电力系统国家重点实验室(华北电力大学),北京102206

出　　处：《南方电网技术》2023年第7期146-154,共9页Southern Power System Technology

基　　金：国家重点研发计划资助项目(2022YFB2403704)。

摘　　要：随着储能变流器向大容量、模块化发展,碳化硅(SiC)器件由于其低损耗、耐高温的特性,逐渐成为研究热点。然而SiC器件过高的开关速度使其对电路中杂散电感更加敏感,并且高温运行环境也会对器件长期安全可靠的运行带来影响。因此针对基于SiC MOSFET的储能变流器功率单元,重点研究了其低感设计和散热设计方法,并提出了功率单元的整体设计方案。通过优化叠层母排的结构,将高压交流模块与低压直流模块的杂散电感分别降低至794μH和235μH,有效减小功率单元的关断过电压。通过热仿真研究,确立了散热方案,使器件在运行过程中的最高温度不超过50℃。最后,搭建了功率单元样机并进行对拖实验,验证了叠层母排结构优化设计和功率单元散热设计方案的有效性。With the development of energy storage converters to large capacity and modularity,silicon carbide(SiC) devices have gradually become a research hotspot due to their low loss and high temperature resistance characteristics.However,the high switching speed of SiC devices makes them more sensitive to stray inductance in the circuit,and the high-temperature operating environment also has an impact on the long-term safe and reliable operation of the devices.Therefore,this paper focuses on the lowinductance design and heat dissipation design methods for SiC MOSFET-based energy storage converter power unit,and proposes an overall design scheme for the power unit.By optimizing the structure of the laminated busbar,the stray inductance of the highvoltage AC module and low-voltage DC module is reduced to 794 μH and 235 μH,respectively,which effectively reduces the turnoff overvoltage of the power unit.Through thermal simulation studies,a heat dissipation scheme is established so that the maximum temperature of the device does not exceed 50 °C during operation.Finally,a power unit prototype is built and dragged for experiments to verify the effectiveness of the optimized design of the laminated busbar structure and the power unit thermal design scheme.

关 键 词：储能变流器 功率单元 叠层母排 杂散电感 散热设计 

分 类 号：TM46[电气工程—电器]