Variable pressure yaw brake hydraulic system for wind generating set and control method thereof

Abstract

The invention discloses a variable pressure yaw brake hydraulic system for a wind generating set and a control method thereof. The variable pressure yaw brake hydraulic system for the wind generatingset comprises a system oil source, a two-position three-way electromagnetic directional valve, a first energy accumulator, a variable pressure oil source loop and a yaw brake. An oil cylinder of the yaw brake communicates with a second oil port of the two-position three-way electromagnetic directional valve through two check valves with the opening directions being opposite. A first oil port of the two-position three-way electromagnetic directional valve is connected with the system oil source and the first energy accumulator. A third oil port of the two-position three-way electromagnetic directional valve is connected with the variable pressure oil source loop. The variable pressure oil source loop comprises two two-position two-way electromagnetic switching valves which are in parallel connection and a second energy accumulator which is connected with the two two-position two-way electromagnetic switching valves. According to the variable pressure yaw brake hydraulic system for the wind generating set and the control method thereof, the proper yaw brake pressure can be automatically and optimally selected according to external loads, the stability in the course of yawing is guaranteed without lowering drive capability, and the probability that yawing drive is subjected to impact loading due to external load magnitude variation and direction switching in the course of yawing is eliminated.

Description

technical field [0001] The invention relates to the technical field of yaw control of a wind power generating set, in particular to a variable pressure yaw braking hydraulic system of a wind generating set and a control method thereof. Background technique [0002] In order to ensure that the wind rotor of the unit is accurately facing the wind when generating power, and to control the load under other working conditions, wind turbines often use active yaw facing the wind. According to the yaw drive mode, it can be divided into motor drive and hydraulic drive. The yaw system mainly includes yaw drive (including yaw motor or hydraulic motor, and reducer), yaw brake, yaw brake disc, yaw bearing, yaw brake hydraulic system, yaw electrical control system and other components composition. When the yaw command is issued, the yaw system drives the nacelle to rotate against the wind. [0003] The existing active yaw driving method uses a yaw brake to realize the damping load when...

AI Technical Summary

Problems solved by technology

However, due to the error of the detection accuracy of the anemometer, the real-time wind direction cannot be detected quickly and accurately. At this time, the fixed pressure damping yaw will increase the difficulty and response speed of the unit yaw to the wind

This not only reduces the maximum utilization rate of wind energy, but also causes uneven force on the blades of the wind turbine during operation, resulting in vibration of the unit and fatigue of the wind turbine blades.

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