Method and device to control a dc-ac converter, particularly for a wind energy plant

摘要

The method involves driving a generator (3) of a converter by a wind rotor (2), for supplying electrical power into a middle voltage power line during voltage drop in the power line, where the converter has an intermediate circuit (42) with an energy storage (43). A low value of the stored energy is determined in dependent of the capacity of the energy storage and lowering the energy stored in the energy storage such that peak power that occurs at the end of the sudden voltage disturbance in the intermediate circuit can be received in the energy storage.