换流阀用与直流断路器用压接型IGBT器件差异分析

摘要

Press pack IGBT (PPI) are becoming ideal switch devices of the flexible HVDC (High Voltage Direct Current) converter valve and the DC (Direct Current) breaker for its high withstand voltage,high current density,low control power,fast switching speed and double side cooling etc.We should develop low on-state voltage drop PPI for converter valve and high short-circuit breaking capacity PPI for DC breaker,according to the particular application in flexible HVDC.This paper has analyzed the differences of current,voltage,temperature and pressure internal and external PPI,respectively for converter valve and DC breaker,summarized probable failure reasons in application of two types of PPI,and put forward some technical issues which should be considered in the packaging design.%压接型IGBT器件以其耐受电压高、电流密度大、控制功率低、开关速度快以及双面散热等优势成为柔性直流输电系统中换流阀和直流断路器选用的理想器件.由于应用装备的差异,换流阀和直流断路器对于压接型IGBT器件分别提出了低通态压降和高短路关断能力的要求.分析了换流阀用压接型IGBT器件和直流断路器用压接型IGBT器件外部和内部电流、电压、温度和压力的差异,总结了两种器件应用过程中可能存在的主要失效原因,提出了封装设计中需要重点考虑的技术问题.