Wind power generation double-hydraulic control variable pitch system

Abstract

The invention discloses a wind power generation double-hydraulic control variable pitch system, which relates to the technical field of wind power generation. By the system, variable pitch control stability and accuracy can be improved, and energy consumption can be reduced; and the system is high in feathering speed. The system comprises a variable pitch base cylinder, an oil supply one-way valve, an oil supply energy accumulator, a cavity A oil inlet throttle valve, a cavity B control valve, a speed control valve, a cavity A hydraulic control one-way valve and a cavity B hydraulic control one-way valve, wherein an external high-pressure oil source is used for supplying oil to the oil supply energy accumulator and the cavity A oil inlet throttle valve through the oil supply one-way valve; a bidirectional lock structure is formed by the two hydraulic control one-way valves; oil outlets of the two hydraulic control one-way valves are connected to two operating cavities of the variable pitch base cylinder respectively; an oil inlet of the cavity A hydraulic control one-way valve is connected with a high-pressure oil source and an oil return pipeline through two control valves respectively; an oil inlet of the cavity B hydraulic control one-way valve is connected to a public port of the cavity B control valve through the speed control valve; and two operating ports of the cavity B control valve are connected with the high-pressure oil source and the oil return pipeline respectively. The system is high in quick feathering response speed.

Description

technical field [0001] The invention relates to wind power generation technology, in particular to a technology of a wind power generation dual-hydraulic control pitch system. Background technique [0002] Existing fan pitch systems all use servo motors or servo valves as the main control components. [0003] The fan pitch system using the servo motor as the main control component controls the fan pitch through the servo controller to control the operation of the pitch servo motor. The pitch servo motor drives the large gear to rotate through the small gear, and the large gear drives the blades to rotate. Pitch, this kind of pitch system has the disadvantage of fast feathering and slow response. [0004] The fan pitch control system using the servo valve as the main control component controls the operation of the oil cylinder through the servo valve when controlling the fan pitch, and the oil cylinder drives the blades to rotate to achieve the pitch change. This pitch contr...

AI Technical Summary

Problems solved by technology

However, in the existing fan pitch system that uses servo valves as the main control components, after the pitch cylinder is controlled to drive the blades to the desired position, it still needs to consume more energy to keep the blades at the current position. The control energy consumption is high, and the gain of the control loop in the positive and negative directions of the pitch cylinder (rod cavity and rodless cavity) is different, so the pitch control stability is poor and the control accuracy is low

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