Comparing the hydraulic and electric pitch systems of wind turbines, the hydraulic pitch system is better.
Analysis of the reasons and defects of the hydraulic launching system:
Compared with the electric launching system, the hydraulic launching system has a small unit volume, light weight and dynamic response. good performance, high torque and no need to shift gears. In the event of a power loss, the pressure accumulator is used as a backup power source to perform a full feathering operation on the blades without the need to design a backup power supply. However, because the propeller blades are constantly rotating, the hydraulic oil pipeline from the hydraulic station in the engine room must be fed into the rotating hub through a rotating joint. The pressure of hydraulic oil is about 20 MPa, so the manufacturing process requires high pressure. requirements and is difficult. Pipelines are also prone to leaks. Due to the influence of the viscosity and temperature characteristics of hydraulic oil, the hydraulic system has relatively high ambient temperature requirements. For fans used at different latitudes, hydraulic oil should be added with a heating or cooling device.