the advantage of variable pitch control WT

Advantages of variable pitch technology

At present, the variable pitch mechanism of wind turbines is basically divided into: electrically controlled variable pitch and centrifugal force variable pitch.

The electronically controlled pitch control mode is passive pitch control, with a controller system to detect generator voltage and current, and equipment such as motors, hydraulics, and push rods are used to achieve blade pitch control. The pitch mechanism requires auxiliary power supply, including backup power sources such as batteries, and the design is complex, therefore the cost is relatively high. Due to the complexity of mechanical design, the failure rate is also high during operation.

Centrifugal force variable pitch is a structure where an iron flying rod is installed at the root of the blade, and the centrifugal force generated by the impeller speed is used to change the blade angle. This structure is a purely mechanical action variable pitch. The use of centrifugal force variable pitch can only be used for high-speed wind turbines, and usually low-speed operation of wind turbines is not conducive to the system. Furthermore, centrifugal pitch control is a reverse pitch control mode with minimal angle variation.