Independent pitch variable system for proportional valve-controlled hydraulic motor

Abstract

The invention relates to the field of wind power generation with a variable pitch, in particular to a variable pitch control system used for controlling a blade and pitch angle of a wind turbine. The variable pitch control system comprises a detection unit, an independent variable pitch control unit and a variable pitch execution unit, wherein the detection unit is used for detecting the blade and pitch angle, a wind wheel rotating speed and a generator rotor speed; the independent variable pitch control unit is used for judging a relation between a wind speed and a cut-in wind speed according to the blade and pitch angle, wind wheel rotating speed and generator rotor speed signals detected by the detection unit, obtaining a pitch angle required by each blade according to a blade root load of each blade and outputting a corresponding control signal; and the variable pitch execution unit is used for independently and respectively regulating the pitch angle of each blade according to the control signal output by the independent variable pitch control unit. The pitch angle of each blade is controlled through an independent hydraulic system; and the independent pitch variable system has the advantages of simple structure, convenience for synchronous control and high control precision, quick response and big torque of the pitch angle and is capable of avoiding the defects, such as complex control mechanism, poor maintenance and the like of the current independent pitch variable system.

Description

technical field [0001] The invention relates to the field of variable-pitch wind power generation, in particular to a pitch-variable control system for controlling the pitch angle of blades of a wind turbine. Background technique [0002] The newly designed high-power wind turbines of major contemporary companies are all using the variable pitch control method for wind wheel control. In the case of different wind speeds and wind rotor speeds, the absorption of wind energy by wind turbines is different. When the wind speed changes, the pitch angle of the blades must be changed accordingly in theory so that the angle of attack of the airflow on the blades can be adjusted. Only by keeping the best can the wind turbine make the best use of wind energy, and achieve the effect of reducing wind energy capture when the rated wind speed exceeds the rated wind speed. When the wind speed is lower than the cut-in wind speed, the wind turbine does not generate electricity, and the pitch...

AI Technical Summary

Problems solved by technology

[0008] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a new wind turbine hydraulic pitch control system, which has all the advantages of the hydraulic pitch system and independent pitch control, and at the same time It avoids the shortcomings of the existing independent pitch control system such as complex control mechanism and poor maintainability

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