SEMICONDUCTOR PROTECTION ELEMENTS FOR CONTROLLING SHORT CIRCUITS AT THE DC END OF VOLTAGE SOURCE CONVERTERS

摘要

Disclosed is a device (1) for converting an electric current, comprising at least one phase module (2a, 2b, 2c) that has an AC terminal (3) and at least one DC terminal (p, n). A phase module branch (11p, 11n), each of which is equipped with serially connected sub-modules (15), is formed between each DC terminal (p, n) and each AC terminal (3), each sub-module (15) being provided with at least one power semiconductor (12, 13). In order to create a device (1) which is able to withstand even high short-circuit currents for a sufficient period of time, semiconductor protecting means (9, 14, 20) are connected in parallel or in series to at least one of the power semiconductors (12, 13).