Pitch drive device capable of emergency operation for a wind or water power plant

摘要

A pitch drive device capable of emergency operation by adjusting the rotor blade pitch of a wind or water power plant. The pitch drive device includes an inverter device and a three-phase current drive motor preferably a three-phase IPM synchronous motor. A direct current power storage device can be substantially directly connected to an intermediate direct current circuit, at least for emergency operation, between a rectifier device and the inverter device for at least briefly supplying power to the synchronous motor, so that the IPM synchronous motor can be operated under speed control when the intermediate circuit voltage UZK is falling. The device enables speed-controlled emergency operation of the pitch drive device at high torque when an intermediate circuit voltage UZK is falling in emergency operation, wherein the direct current energy storage device can, improve the efficiency as an energy buffer, and reduce current transfer via the rotor slip ring.

主权项

1. A pitch drive device comprising:
an inverter device and a three-phase current drive motor configured to adjust the pitch of a rotor blade of a wind power plant or water power plant, wherein the drive motor is a three-phase current IPM (Interior Permanent Magnet) synchronous motor; and a direct voltage energy storage device connected in both a normal operating mode and in an emergency operating mode substantially directly to a direct voltage intermediate circuit between a rectifier device and the inverter device without isolating diodes, such that a level of an intermediate circuit voltage VZK of the inverter device and of the energy storage device is nominally identical, in order to at least briefly supply energy to the IPM synchronous motor for driving said rotor blade in a safe vane position, with the result that the IPM synchronous motor can be operated at least briefly under rotational speed control in the safe vane position even when the intermediate circuit voltage VZK is dropping, load peaks can be taken up by the stored energy in the energy storage device and reversing energy of the IPM synchronous motor can be stored in the energy storage device.