| 摘要 |
A method is described and presented for the operation of a pitch system of a wind turbine with at least one rotor blade, whereby the pitch system has at least one input rectifier (1) and at least one pitch drive (2), whereby each rotor blade can be rotated around its longitudinal axis by the one pitch drive (2) or by at least one of several pitch drives (2), each input rectifier (1) is supplied with alternating voltage by a supply network (3), and each pitch drive (2) is supplied with electric power by the one input rectifier (1) or by at least one of several input rectifiers (1), each pitch drive (2) is connected to an emergency power storage device (4), whereby each pitch drive (2) can be supplied with electric power by the emergency power storage device (4) that is connected to it. A method for the operation of a pitch system of a wind turbine that, even in case of moderate network overvoltages, permits the continued operation of the pitch system, is achieved according to the invention in that the pitch system has at least one supply voltage measuring device (5), each input rectifier (1) has at least one semiconductor switching element (6) with which a flow of current from the supply network (3) into the respective input rectifier (1) can be blocked, whereby each supply voltage measuring device (5) measures the voltage of the supply network (3) and, if the measured voltage of the supply network (3) or a value calculated from several measured voltages exceeds a first voltage value, then each semiconductor switching element (6) blocks the flow of current from the supply network (3) into the respective input rectifier (1), and each pitch drive (2) is supplied with electric power by the emergency power storage device (4) that is connected to it. |
