Adjusting rotor blades of a wind power system in emergency operation

摘要

Device for adjusting rotor blades of a wind power installation, with an adjustment motor (3), with a mains power supply device (1), with a reducing transformer (10) and with a supply device of emergency current (2) containing an energy accumulator (8) and with a booster transformer (9) that during emergency operation can be connected to the adjustment motor (3) to provide the necessary electrical energy for an adjustment of the rotor blades to a flag position thereof, the emergency power supply device (2) being coupled to a mains power supply device (1) that stops the flow of electrical energy from a current network to the adjustment motor (3) has a rectifier (4) on the side of the mains, an intermediate circuit (5) arranged next to it and an inverter (6) arranged next to it, the accumulator of e nergy (8) by means of the elevator transformer (9) to the intermediate circuit (5) of the mains power supply device (1), such that during emergency operation at least a nominal intermediate circuit voltage is provided ( UZ) present in the intermediate circuit (5) during normal operation, and the energy accumulator (8) being coupled through the reducing transformer (10) to the rectifier (4) for feeding a feedback energy from the intermediate circuit ( 5) to the energy accumulator (8).