对于IGCT重触发阈值设置的研究

Study of the Threshold Setting for IGCT Re-trigger

集成门极换流晶闸管(IGCT)作为一种新型电流型器件,它是在门极可关断晶闸管(GTO)基础上发展而来的。由于IGCT集成了门极换流晶闸管(GCT)和门极驱动电路,具备高压大电流等优点,故广泛应用于大功率场合。IGCT器件的特殊性,决定了它应用于电压源型变流器时有特别之处。这里从IGCT的结构特点出发,结合IGCT器件的开通原理及门极驱动电路工作原理,分析了IGCT的重触发机理,并指出IGCT需要重触发的必要性。进而通过介绍在IGCT驱动板中实现重触发的方法,提出内部重触发阈值需合理设置的结论。为正确设置重触发阈值,提出一种实验方案来模拟在电压源型逆变器中IGCT需重触发的工作情况。实验结果表明,此方案可验证内部重触发阈值是否设置合理,从而提高IGCT应用的可靠性和安全性。

Integrated gate commutated thyristor（IGCT） is developed on the basis of the gate turn-off thyristor（GTO） as a new current-type device.IGCT integrated gate commutated thyristor（GCT） and gate drive circuit with a high-voltage high-current, etc., and is widely used in high power applications.The application of IGCT to the voltage source converter is quite unique because of its specialty.This thesis argues that it is necessary and important to make the re-trigger of IGCT and analysis of the IGCT re-trigger mechanism based on the analysis of the specialty of IGCT, the principle of switching and the working principle of drive circuit and points out that internal re-trigger threshold needs to be setted reasonably.And in order to properly set re-trigger threshold,proposes an experimental program to simulate the IGCT needed to re-trigger in voltage source inverter.The experimental results show that this program verify whether to set a reasonable threshold, thereby improving the reliability and safety of the IGCT application.