固态限流器中大功率IGCT并联关断保护电路  

Protection Circuit for Large Power Parallel Connected IGCTs Turning off in a Solid State Fault Current Limiter

作　　者：琚兴宝[1] 彭振东 肖友国 孙海顺[1] 周鑫[1] 

机构地区：[1]强电磁工程与新技术国家重点实验室(华中科技大学),武汉430074 [2]武汉船用电力推进装置研究所,武汉430064

出　　处：《高电压技术》2018年第2期395-402,共8页High Voltage Engineering

摘　　要：集成门极换流晶闸管（integrated gate commutated thyristor,IGCT）具有大电流导通损耗低和关断过程快速均匀可靠等特性,在固态限流器（solid state fault current limiter,SSFCL）应用中具有综合优势。为此,针对固态限流器中并联运行的大功率IGCT,通过构建器件的集总电荷仿真模型对其关断过程进行了仿真分析,并结合试验验证深入研究了RC阻容缓冲和压敏电阻保护对并联IGCT关断特性的影响。大电流关断研究结果表明：RC缓冲能进一步缓解并联IGCT关断过程中的电流拥挤现象,降低拖尾电流下降率,减轻器件动态雪崩击穿的剧烈程度;在固态限流器中回路电感和关断电流均比较大的条件下,增加RC缓冲能大幅提高并联器件的关断可靠性。该研究成果可以为并联IGCT有效保护方案的设计提供参考。Possessing the characteristics of relatively low on-state loss, as well as very quickly, uniformly and reliably turning off process for a large current, the integrated gate commutated thyristor（IGCT） has gained comprehensive advantages in a solid state fault current limiter（SSFCL）. Aiming at the parallel connected large power IGCTs in a SSFCL, we simulated the turning off process through a lump charge IGCT model developed in this paper. Then, we studied the effects of RC snubber metal oxide varistor protection on the parallel IGCTs turning off characteristics with the help of some related tests. The large current turning-off research results indicate that the current crowding phenomena can be relieved further, the falling rate of tail current may be reduced a lot and the dynamic avalanche breakdown will be alleviated very much for the parallel IGCTs turning off with a RC snubber. The turning off process for the parallel devices will be more reliable if an additional RC snubber is adopted in a SSFCL with large current and circuit inductance. These achievements can be taken as references for designing valid parallel IGCTs protection schemes.

关 键 词：集成门极换流晶闸管 固态限流器 并联运行 关断保护 RC缓冲 压敏电阻 

分 类 号：TM471[电气工程—电器] TN34[电子电信—物理电子学]