APPARATUS FOR CONVERTING AN ELECTRICAL CURRENT AND METHOD FOR REDUCING THE LOAD-CHANGE STRESS OF POWER SEMICONDUCTOR UNITS IN THE HIGH-VOLTAGE ENERGY DISTRIBUTION AND TRANSMISSION SECTOR

摘要

In order to provide an apparatus (1) for converting an electrical current in the high-voltage energy distribution and transmission sector with at least one current converter valve (2a, 2b), which has a series circuit comprising power semiconductor units, and having cooling means (3, 4, 5, 7) for cooling the power semiconductor units, with which apparatus temperature deviations of the power semiconductor units can be decreased in a cost-effective manner, the invention proposes providing the cooling means (3, 4, 5, 7) with control means, which provide cooling which is dependent on the current flow via the power semiconductor units.