基于SiC MOSFET的储能功率单元设计与实证

Design and Demonstration of Energy Storage Power Unit Based on SiC MOSFET

随着可再生能源的快速发展,储能变流器在新能源电网中发挥着至关重要的作用。针对基于SiC MOSFET的储能变流器功率单元,其中包含10 kV高压交流模块和750V低压直流模块,重点研究了功率单元的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。通过热数值计算,确立了强迫风冷的散热方案,并设计了符合要求的散热器,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 rapid development of renewable energy,energy storage converters play an important role in the new energy grid.Aiming at the power unit of energy storage converter based on SiC MOSFET,including 1O kV high voltage AC module and 750 V low voltage DC module,focuses on the low sensing design and heat dissipation design method of power unit,and puts forward the overall design scheme of power unit.By optimizing the structure of the laminated bus,the stray inductance of the high voltage AC module and the low voltage DC module is reduced to 794μH and 235μH respectively,which effectively reduces the turn-off overvoltage of the power unit.Through thermal numerical calculation,the heat dissipation scheme of forced air cooling is established,and the heat sink is designed to meet the requirements,so that the maximum temperature of the device in operation is not more than 50 C.Finally,the prototype of the power unit is built and the towing experiment is carried out to verify the effectiveness of the optimization design of the structure of the laminated bus and the cooling design of the power unit.