WIND TURBINE GENERATORS

摘要

A wind turbine generator (WTG) 1 is connected to the electricity grid 2 by switchgear 3. A control system 8 disconnects the WTG 1 from the grid 2 in the event of a fault and also if the grid voltage falls below its normal value for a predetermined time, to prevent the WTG 1 from being connected when the control system is not functional. A battery 7 supplies power to the control system 8. When the control system 8 is fully functional, the WTG 1 is manually re-connected to the grid 2. Alternatively, the control system 8 enters a “SLEEP” mode during which the grid voltage continues to be monitored. When the grid voltage returns, the control system 8 reverts to its “WAKE” mode and draws sufficient power from the battery 7 to become fully functional, at which point the WTG 1 is re-connected to the grid 2.

主权项

1. A method of disconnecting a wind turbine generator (WTG) from an electricity grid in the event of power loss in the grid and subsequently reconnecting the WTG to the grid after the grid regains power, wherein the WTG comprises one or more auxiliary circuits, the method comprising:
(a) detecting when the power in the grid falls below a predetermined level for more than a predetermined time; (b) in response thereto, disconnecting the wind turbine generator from the grid; (c) detecting a return of power to the grid; (d) in response thereto, supplying power to the auxiliary circuits; (e) determining when the powered auxiliary circuits are functional; and (f) in response thereto, reconnecting the wind turbine generator to the grid.