Research on the transient state of large power voltage source inverter with IGCTs

IGCTs have the features of high current, high voltage, high reliability, compact structure and low loss. They have been widely used in large power voltage source inverter systems now, and they have extensive application prospect. In the paper, the switching property of IGCT used in large power voltage source inverter is investigated. And part of the simulation results are verified with experiment results. The switching process of IGCT will cause the mutation of current and voltage in the inverter. And the short circuit process of the inverter is analyzed. If short circuit occurs in the inverter, resonance current and voltage will appear in the inverter. So, during the design of the inverter, EMC should be carefully considered.