Overrun Protection for Wind Turbines

摘要

A braking system for a turbine of a wind powered includes a hydraulic machine connected to a drive shaft of the turbine. A pressure regulating valve in the supply line of the hydraulic machine determines the pressure delivered to the supply line by the hydraulic machine. A control that is responsive to the speed of rotation of the drive shaft modulates the pressure regulating valve so as to increase pressure in the supply line as the rotational speed exceeds a predetermined speed to apply a braking force to the drive shaft.

主权项

1. A braking system for a turbine of a wind powered generator, said turbine having a propeller and a drive shaft connected to said propeller for rotation therewith, said braking system including a hydraulic machine connected to said drive shaft, an outlet from said hydraulic machine to deliver fluid to a supply line upon rotation of said drive shaft, a pressure regulating valve in said supply line to determine the pressure delivered to the supply line by said hydraulic machine, and a control responsive to the speed of rotation of said drive shaft to modulate said pressure regulating valve, said control modulating said pressure regulating valve to increase pressure in said supply line as said rotational speed exceeds a predetermined speed to apply a braking force to the drive shaft.