PITCH DRIVE SYSTEMS AND METHODS

摘要

A wind turbine pitch drive system comprises an electric grid for supplying electrical power, a motor for driving a pitch actuator, an electronic converter for controlling the motor and a back-up energy storage unit for supplying electrical power. The electronic converter comprises a DC-link capacitor bank. The system furthermore comprises a switching device for selectively connecting the DC-capacitor bank link to the back-up energy storage unit, and a frequency generator for controlling the switching device. Also disclosed is a method for protecting a component of the electronic converter.

主权项

1. A wind turbine pitch drive system comprising:
an electric grid configured to supply electrical power; a motor configured to drive a pitch actuator; an electronic converter configured to control the motor, the electronic converter including a DC-link capacitor banka back-up energy storage unit configured to supply electrical power; and
a switching device configured to selectively connect the DC-link capacitor bank to the back-up energy storage unit; and a frequency generator configured to control the switching device.