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

An apparatus for converting an electrical current in a high-voltage energy distribution and transmission system has one or more current converter valves with a series circuit of a plurality of power semiconductor units. A cooler cools the power semiconductor units. Temperature deviations of the power semiconductor units can be decreased in a cost-effective manner in that the cooler is provided with a control unit that provides cooling in dependence on a current flow via the power semiconductor units.