Direct drive type hydraulic variable pitch controlling mechanism for wind power generator

Abstract

The invention relates to a direct driving type hydraulic propeller-pitch variation control mechanism of a wind powered generator, which belongs to the technique field of wind power generating equipment. The invention provides the direct driving type hydraulic propeller-pitch variation control mechanism which comprises a closed type oil tank, an alternating current servo motor, a two-way constant rate pump, an oil supplementing valve, a hydraulic lock and a propeller-pitch variation hydraulic cylinder aiming at the problem of the complex hydraulic loop and the low reliability and the defect of no redundant control of a hydraulic propeller-pitch variation control mechanism of a prior wind powered generator. In addition, a power output shaft of the alternating current servo motor is connected with a power input shaft of the two-way constant rate pump which is connected with the propeller-pitch variation hydraulic cylinder through the hydraulic lock, the closed type loop is formed by two oil ways positioned between the two-way constant rate pump and the propeller-pitch variation hydraulic cylinder, two oil inlet and outlet openings of the oil supplementing valve are respectively connected with the two oil ways positioned between the two-way constant rate pump and the propeller-pitch variation hydraulic cylinder, and a third oil inlet and outlet opening of the oil supplementing valve is connected with an oil inlet and outlet opening of the closed type oil tank. The invention has the advantages of simple structure, reliable control, light weight, small floor area, and the like.

Description

technical field

[0001] The invention relates to the technical field of wind power generation equipment, in particular to a hydraulic pitch control mechanism of a wind power generator. Background technique

[0002] There are two types of large wind turbines, fixed pitch and variable pitch. The windward angle of the fixed-pitch fan is fixed. When the wind force is greater than a certain value, the speed will be too high and the unit cannot work normally. Adjust the pitch angle at any time to control the absorbed mechanical energy, on the one hand to ensure the maximum energy (corresponding to the rated power), and to reduce the impact of wind on the wind turbine. In the process of grid connection, pitch control can also realize fast grid connection without impact. The variable pitch control system cooperates with variable speed and constant frequency technology, which ultimately improves the power generation efficiency and power quality of the entire wind power generation sy...

Images