Pitch system for a wind energy assembly and method for operating the same

摘要

#CMT# #/CMT# The method involves adjusting a pitch angle of a rotor blade of a wind power plant using an electric motor (14) of a pitch system (10), and temporarily supplying electric power to the motor from an external supply network (22) in a normal operation mode of the plant. The blade is moved into a securing position by the motor, and the power is supplied to the motor from an emergency energy storage (18) of the system in an emergency operation mode of the plant. The motor is temporarily supplied with the power from the storage in the normal operation mode to check characteristics of the storage. #CMT# : #/CMT# The external supply network is designed as a three-phase alternating voltage system. The emergency energy storage is designed as a double-layer capacitor, and capacitance and/or internal resistance of the capacitor are checked as the characteristics of the emergency energy storage. An independent claim is also included for a pitch system for adjusting a pitch angle of a rotor blade of a wind power plant. #CMT#USE : #/CMT# Method for operating a pitch system utilized for adjusting a pitch angle of a rotor blade of a wind power plant. #CMT#ADVANTAGE : #/CMT# The electric motor is temporarily supplied with the electric power from the emergency energy storage in the normal operation mode of the wind power plant to check the characteristics of the emergency energy storage, thus ensuring safe operation of the wind power plant while increasing the availability of the pitch system for normal operation of the wind power plant. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a block circuit diagram of a blade pitch angle adjusting system of a pitch system. 10 : Pitch system 14 : Electric motor 16 : Control unit 18 : Emergency energy storage 22 : External supply network.