The author introduces the basic structure of ± 1 100 kV/ 5 000 A converter valve

and analyzes the limiting factors of converter valve operation current.AC system ground fault which cause the converter station AC bus voltage reduced will affect the operating conditions of the converter valve.Take the ± 1 100 kV/5 000 A thyristor converter valve which is produced by Xi’an XD Power Systems Co.

Ltd.for an example

through the main circuit parameter calculation and thyristor junction temperature calculation based on the actual operation condition analysis of the ±1 100 kV/5 000 A converter valve in the AC system fault operation ability.