Investigation on the protection system of the large power converter with IGCT

Large power three-level voltage source converters with IGCT are being used in medium or large power drive systems now and have prospective future. The protection system is very important to the safe operation of the converter. Method should be carefully taken to protect the converter when fault takes place in the converter, especially over-current due to short circuits in the load or in the converter itself. The converter system is introduced. With software simulation and experiment, the short circuit process of the converter is investigated. Then the schematic diagram of the inverter with protection system is designed. System experiment shows the converter has excellent performance.