特高压直流输电用6英寸晶闸管恢复特性的优化

Optimization of 6 Inch Thyristor Recovery Characteristics for Ultra High Voltage Direct Current Transmission

为了进一步优化特高压直流(UHVDC)输电工程用晶闸管器件的设计,提升UHVDC换流阀的运行性能,基于6英寸8.5 kV T型门极晶闸管开发出Y型门极晶闸管;采用先进3D器件仿真与试验相结合,优化门极及阴极短路结构来实现器件通态压降、存储电荷、关断时间之间的协调配合,获得优化的动态参数组;在保障器件阻断电压满足高压直流(HVDC)应用要求的基础上,减小了器件通态压降,降低了反向恢复储存电荷,缩短了关断时间,大大提高了器件性能。所研制的新型6英寸晶闸管已在多个试验室检测验证,并且在昌吉-古泉±1100 kV UHVDC工程获得实际应用。

In order to further optimize the design of thyristor devices for ultra high voltage direct current(UHVDC)transmission projects and improve the operating performance of UHVDC converter valves,Y-type thyristors are developed based on 6 inch 8.5 kV T-type thyristors.Advanced 3 D device simulation and experiments are used in combination,the gate and cathode short-circuit structures are optimized to achieve the coordination and cooperation between on-state voltage drop,stored charge and turn-off time to obtain an optimized dynamic parameter set.On the basis of ensuring that the device blocking voltage meets high voltage direct current(HVDC)application requirements,the device’s on-state voltage drop and the reverse recovery stored charge are reduced,the turn-off time is shorten and the device performance is greatly improved.The new 6 inch thyristor developed has been tested and verified in multiple laboratories and has been applied in Changji-Guquan±1100 kV UHVDC project.