Active and passive coordinated regulated magnetic levitation wind yawing system

Abstract

The invention discloses an active and passive coordinated regulated magnetic levitation wind yawing system applied to large- and medium-sized wind turbine generators. The system comprises a cabin, a yawing supporting body, a pitch adjusting suspension rack and a suspension tower to finish enhancement of pitch rigidity of the yawing supporting body, high frequency air gap fluctuation inhibition, horizontal displacement passive adjustment, active suspension control and cabin yawing control in a coordinated manner; a 6mm thick aluminum plate is arranged in a cabin base of the yawing supporting body to generate an eddy-current damping force to passively inhibit high frequency fluctuation of an axial suspension air gap. The pitch rigidity of the cabin is enhanced by means of the pitch adjustingsuspension rack, permanent magnets and a suspension tower-based support, and the active suspension degree of freedom, the horizontal repulsive force between the permanent magnet on the inner side ofthe yawing supporting body and the permanent magnet on the outer side of the suspension tower and the passive balanced water level displacement are reduced; windward and crosswind protection of passive yawing when the cabin is suspended stably is achieved under control of a master control unit DSP28035 of a BUCK converter, an H bridge converter and a three phase inverter by active suspension and yawing separately.

Description

technical field [0001] The invention relates to a fan yaw system of a large and medium-sized wind turbine, through active and passive coordinated regulation to realize yaw facing windward and sidewind protection under nacelle suspension, especially a wind-forced magnetic levitation that can reduce the degree of freedom of active suspension control and suspension power consumption Yaw system. Background technique [0002] With the aggravation of environmental pollution and energy crisis, wind power generation has attracted the attention of countries all over the world because of its complete non-pollution. Wind yaw systems are key components of large horizontal-axis wind power systems, enhancing maximum capture of wind energy and protection from crosswinds. The traditional wind power yaw system generally adopts multi-motor multi-gear coupling technology, which has problems such as complex structure, high failure rate, and poor anti-interference ability. , which seriously af...

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Problems solved by technology

The traditional wind power yaw system generally adopts multi-motor multi-gear coupling technology, which has problems such as complex structure, high failure rate, and poor anti-interference ability. , which seriously affects the stability of the system. Invention patents 200910161406.7 and 201410143297.7 respectively disclose two kinds of magnetic levitation wind yaw systems, which realize the yaw windward and crosswind protection under the stable suspension of the cabin, and greatly reduce the yaw power consumption. However, the magnetic levitation The nature of the system is non-linear, weakly damped and unstable, especially the wind-driven yaw system, which generally operates on a tower with a height of 80 meters. The wind speed fluctuates randomly, which can easily cause suspension vibration or instability. Active suspension control is to ensure The stable suspension of the wind turbine nacelle is the key, but the swept area of ​​the wind turbine blades is much larger than the area of ​​the tail of the nacelle. There is a pitching motion in the suspension process of the wind turbine nacelle. Multi-degree-of-freedom active suspension control is the key to improving the wind maglev yaw system, but there is no doubt that more While the active control of degrees of freedom brings high-precision suspension performance, it will also increase the number of sensors, converters, and controllers, resulting in an increase in the volume and weight of the suspension cabin and the increase in suspension power consumption

In recent years, passive suspension bearings have appeared. The suspension air gap is passively completed by permanent magnets. It has the advantages of simple structure, low energy consumption, compact structure, and no converter assistance. However, the suspension air gap is easily affected by external interference.

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