Rotor-blade pitch controlling drive for a wind turbine

摘要

A method of operating a rotor-blade pitch controlling drive of a wind turbine comprising supplying electrical energy to an electrical working load by a primary electrical energy supply, charging an electrical energy storage device by means of a charger, supplying electrical energy to the electrical working load by the electrical energy storage device if the primary electrical supply fails, and temporally disconnecting the electrical energy storage device from the charger in successive intervals, while applying an electric test load to the electrical energy storage device and observing the electrical discharge of the electrical energy storage device.

主权项

1. A rotor-blade pitch controlling drive for a wind turbine comprising:
a control system; an electrical working load; an electrical test load; a primary energy supply supplying electrical energy for the electrical working load; an intervening converter, the working load being electrically coupled to the primary energy supply via the intervening converter, the converter being coupled to the control system by means of which the converter is actuated to turn a rotor-blade on a blade axis; an electrical energy storage means which is operable to be electrically coupled to the working load and by means of which the working load is operable to be supplied with electrical energy if the primary energy supply fails, while the electrical test load is uncoupled from the electrical energy storage means; an electrical switching arrangement responsive to the control system, the electrical switching arrangement configured to directly couple the electrical energy storage means to the working load when the primary energy supply fails, the electrical switching arrangement being controlled by the control system; a charger operable to charge the electrical energy storage means; and an analyzing arrangement configured to analyze an electrical discharge of the electrical energy storage means at successive intervals; at each one of the successive intervals, the control system operating to:
control the electrical switching arrangement to electrically disconnect the electrical energy storage means from the working load, and thus electrically isolate the electrical energy storage means from the working load and from the primary energy supply;control the electrical switching arrangement to electrically disconnect the electrical energy storage means from the charger, to thus electrically isolate the energy storage means from the charger; andcontrol the electrical switching arrangement to temporarily electrically couple the electrical test load to the electrical energy storage means, while the working load and the charger are both uncoupled from the electrical energy storage means.