Pitch control is a core technology for Wind power equipment to control blades and ensure safe and stable power generation. In a word, pitch control is the process of adjusting the angle between wind turbine blades and the wind (known as the pitch angle) to control the amount of wind energy captured and the rotational speed of the wind turbine.

Core Functions of Pitch Control

By primarily adjusting the pitch angle, the pitch control system fulfills three core functions, which directly affect the efficiency and safety of the wind turbine.

• Maximizing power generation efficiency: When wind speed is low, the pitch control system adjusts the pitch angle to the optimal position (usually close to 0°). This allows the blades to face the wind with the largest possible area, capture the maximum wind energy, and ensure optimal power output.
• Limiting wind turbine speed: When wind speed is too high (exceeding the rated wind speed), the pitch control system increases the pitch angle. This reduces the wind-facing area of the blades, decreases wind energy absorption, and prevents component damage due to overloading caused by excessive rotational speed of the wind turbine.
• Enabling emergency shutdown: In case of extreme weather (such as typhoons) or equipment failures, the pitch control system quickly adjusts the pitch angle to 90° (feathering state). At this point, the blades barely face the wind, and the wind turbine stops rotating rapidly under the effect of wind resistance, ensuring the safety of the equipment.

SINOTEST Pitch Mechanical Testing Rig adopts electro-hydraulic servo loading technology, combined with a high-frequency response electro-hydraulic servo actuator system and an advanced controller. It can conduct various tests, including linear loading test, planar loading test and torque loading test of pitch bearings. According to the design requirements, it can perform two types of tests for pitch bearings: linear loading test and planar loading test.

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