| 摘要 |
The present invention relates to a method for operating a pitch system including at least one rotor blade. The pitch system includes at least one input rectifier (1) and at least one pitch drive (2). Each rotor blade is rotated around a lengthwise shaft by one pitch drive (2) or at least one of several pitch drives (2). Alternating current voltage is supplied to each input rectifier (1) by a supply network (3). Power is supplied to each pitch drive (2) by an emergency electricity storage device (4) which is connected with each pitch drive (2) and to which power is supplied by at least one of the input rectifiers (1). The pitch system includes at least one supply voltage measuring device (5). The input rectifier (1) includes at least one semiconductor switching element (6) to block flow of current flowing to the input rectifier (1) from the supply network (3). If a value calculated from the measured voltage or various measured voltages of the supply network (3) is greater than a first voltage value when the supply voltage measuring device (5) measures the voltage of the supply network (3), the semiconductor switching element (6) blocks the flow of current flowing from the supply network (3) to the input rectifier (1). Even if the network is at overvoltage, the pitch system continues to be operated by allowing the emergency electricity storage device (4) connected with the pitch drive (2) to supply power. |
