Undamped hydraulic yaw system based on pressure detection and control method of undamped hydraulic yaw system

Abstract

The invention relates to an undamped hydraulic yaw system based on pressure detection and a control method of the undamped hydraulic yaw in the field of wind power generation technology. The undamped hydraulic yaw system comprises a motor, an oil pump, a relief valve, an oil tank, a pressure relay, an energy accumulator, a safety valve group of the energy accumulator, a proportional valve, a single-way valve, a low-speed high-torque hydraulic motor, a yaw gear, a presser sensor, a yaw coder, a cabin inner gearing ring, a yaw counter and an anemoscope. The control method of the undamped hydraulic yaw system comprises the following steps: using a position detection method to realize the function of fast aiming the wind direction during the yawing; using a pressure detection method to realize the function of precisely aiming the wind direction; and at the same time, not introducing damp. The undamped hydraulic yaw system provided by the invention is characterized in that: the detection error of the anemoscope can be prevented from influencing the yaw system based on the accurate wind-direction aiming function for pressure detection, the damped yaw is canceled during the yawing to reduce the frictional abrasion caused by braking, so that the power waste caused by the traditional damped yaw is avoided.

Description

technical field [0001] The invention relates to a large-scale wind power generating set suitable for megawatts, in particular to a pressure-detection-based non-damping hydraulic yaw system and a control method in the technical field of wind power generation. Background technique [0002] Large-scale wind turbines are generally composed of wind rotors, speed-increasing gearboxes, generators, yaw devices, transmission systems, pitch control mechanisms, control systems, towers and other components. Among them, the yaw system is an indispensable part of the wind turbine. Its role is to cooperate with the control system of the wind turbine. When the direction of the wind speed vector changes, the wind rotor of the wind turbine can quickly and smoothly align with the wind direction. , so that it is always in the windward state, improving the power generation efficiency of the wind turbine. [0003] The functions of the yaw system include: automatically and accurately facing the w...

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned yaw system adopts the damped yaw mode during operation, which increases the friction and wear of the brake caliper and generates a large waste of power

At the same time, because the direction of the natural wind changes in real time, it is necessary to continuously rotate the nacelle so that the wind rotor is always facing the wind to increase the capture rate of wind energy. However, due to the large error in the detection accuracy of the anemometer, the wind direction cannot be accurately detected, resulting in deviation. It is difficult for the navigation system to accurately control the rotation position of the nacelle, which not only reduces the maximum capture rate of wind energy, but also causes uneven force on the blades of the symmetrical wind turbine during operation, resulting in vibration of the unit and fatigue of the wind rotor blades; To detect the adverse effects of errors on the yaw system, it is necessary to introduce a power control method within a small control angle (generally within 15 degrees), and design a complex control strategy to achieve accurate wind-facing of the nacelle, increasing the difficulty of system design

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