Hybrid suspension air gap adjustment type wind turbine yaw system

Abstract

The invention discloses a hybrid suspension air gap adjustment type wind turbine yaw system applied to large and medium-sized wind generation sets. The hybrid suspension air gap adjustment type wind turbine yaw system comprises a turbine room rotary body, a composite tower, a yaw driver and the like. By adoption of the wind turbine yaw system, yawing and lateral deviation protection with a suspension air gap and yaw load torque being dynamically adjustable can be achieved. The turbine room rotary body comprises a turbine room, a turbine room base, a permanent magnet annular strip and an inner gear speed adjustment ring and cooperates with the composite tower and the yaw driver to complete turbine room suspension and yawing. The composite tower comprises a suspension supporting body and a tower body. The suspension supporting body is internally provided with a stator annular strip. The stator annular strip and the permanent magnet annular strip are correspondingly arranged, jointly generate suspension repulsion to achieve turbine room suspension and meanwhile provide torque excitation for the yaw driver. The yaw driver comprises a yaw rotary disc, a rotary central shaft, a driving wheel and a transmission shaft wheel, generates yaw torque and drives the turbine room to yaw in a variable-ratio mode. By adoption of the hybrid suspension air gap adjustment type wind turbine yaw system, mechanical constraint of turbine room suspension and yaw is greatly reduced, yaw torque is dynamically changed, and suspension yaw stability of the turbine room is improved.

Description

technical field [0001] The invention relates to a hybrid suspension air gap adjustment wind turbine yaw system, especially a wind energy capture device that is applied to large and medium-sized wind power systems and can realize low power consumption yaw protection against wind and lateral deviation, especially can realize suspension air Gap adjustable yaw load torque changes yaw against wind. Background technique [0002] As a new energy source, wind power has become the focus of energy strategies of countries all over the world. The wind turbine yaw system is a key component of the wind turbine, which can realize the side yaw protection of the wind turbine blades always facing the wind and exceeding the rated power, effectively improving the captured power of the wind turbine and ensuring the safety and stability of the wind turbine. [0003] The traditional wind power yaw system generally adopts multi-motor multi-gear coupling technology, and the transmission ratio can e...

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Problems solved by technology

[0003] The traditional wind power yaw system generally adopts multi-motor multi-gear coupling technology, and the transmission ratio can even reach more than 10,000. There are problems such as complex structure, high failure rate and poor wind accuracy, especially the large friction loss makes the yaw power consumption of wind turbines Larger, affecting the effective output power of the fan

Invention patent 200910161406.7 discloses a magnetic levitation yaw device, which uses magnetic levitation drive technology, which greatly reduces the yaw failure rate and maintenance costs. However, since the wind turbine nacelle often runs on a 40m high tower, the overturning moment generated by the fan blades can easily cause the center of gravity of the wind turbine nacelle to shift and overturn, and the longitudinal friction is still relatively large. The weight makes the turning torque larger, and the power requirement for the maglev yaw motor is still very large. However, because the cabin suspension and the yaw motor share the air gap magnetic field, the maximum electromagnetic torque of the yaw motor is limited by the cabin suspension air gap, which often makes it impossible for the fan to achieve Yaw-to-wind and yaw protection under large yaw load fluctuations

However, the problem of sharing the air gap magnetic flux between the suspension of the nacelle and the yaw motor still exists, especially the yaw of the wind turbine is essentially the start-up of the yaw motor with a large load. Fluctuations can also easily lead to yaw speed and air gap fluctuations, and even lead to the overall vibration, instability and shutdown of the wind turbine, seriously affecting the safe operation of the wind power generation system

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