Independent pitch system and pitch method based on effective hydraulic damping

Abstract

The invention relates to an independent pitch changing system and a pitch changing method based on effective hydraulic damping, which belong to the technical field of wind power generation. Each blade has an independent pitch control device, the pitch control device includes a pitch controller, a pressure detection device, a hydraulic actuator and a hydraulic damper, and the hydraulic actuator is connected to the hydraulic damper and the pitch controller respectively, The pressure detection device connected to the hydraulic actuator of each blade is respectively connected to the pitch controllers of the three blades, and the pitch controllers of the three blades are connected to each other. It is connected with the hydraulic station of the wind turbine. The present invention calculates the position of each blade by collecting the signal of the pressure detection device on each blade, analyzing and comparing them, and the pitch controller sends corresponding different pitch commands to the three blades, and the hydraulic actuator performs the adjustment. The corresponding pitch action improves the utilization rate of wind energy and reduces the flapping vibration of the blades by the wind.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to an independent pitch changing system and a pitch changing method based on effective hydraulic damping. Specifically, the measuring pressure signal is used to carry out a hydraulic effective damping independent pitch changing system and a pitch changing method. Background technique [0002] The pitch control mechanism of the current wind turbine usually controls the three blades of the wind turbine uniformly through the electro-hydraulic proportional control system, and the three blades of the wind turbine are adjusted and controlled synchronously through the actuator. The existing technical problems are: firstly, the precondition for uniform pitch adjustment is that the wind speed in the sweep plane of the wind rotor is the same, but this is impossible in practice. , the difference in wind speed between the highest end and the lowest end of the sweeping...

AI Technical Summary

Problems solved by technology

The existing technical problems are: firstly, the precondition for uniform pitch adjustment is that the wind speed in the sweep plane of the wind rotor is the same, but this is impossible in practice. , the difference in wind speed between the highest end and the lowest end of the sweeping surface of the wind rotor makes the absorbed power differ by 20%, which makes the unified pitch no advantage

However, the blade pitch angle changes only from 0 to 90° during the pitch change process, and the pitch control most often occurs between 10° and 20°, so that the driving gear and the inner gear of the hub are always those few gears In the end, it is often those gears that fail and the entire inner ring gear must be replaced

And the use of pulley transmission to spread the load will also cause the belt to often appear aging and loose

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