Influence of the Snubber Circuit on the Commutation Process of High-Power Five-Level Converter

摘要

The snubber circuit is used to suppress the internal overvoltage and over-current of the electronic devices and reduce the switching losses of the device. This chapter studies the commutation process of the high-power five-level bridge converter, especially the influence of the snubber circuit on the commutation process. Each parameter of the snubber circuit has been verified to have an influence on the changes of the integrated gate-commutated thyristors' (IGCT) turn-on and turnoff voltage by simulation. This can provide an important theoretical basis and guidance for the design and control of the practical high-power multilevel system. And the parameters of the snubber circuit designed by this way have been successfully applied to the inverter system of 20 MW.