Middle-sized low-speed permanent magnetic direct drive wind turbine generator and parameter self-study control method thereof

Abstract

The invention presents a middle-sized low-speed permanent magnetic direct drive wind turbine generator and a parameter self-study control method thereof, and belongs to the technical field of wind power. The low-speed permanent magnetic direct drive wind turbine generator structure (shown as Figure 1) comprises a wind wheel-1, a main shaft-2, a main bearing base-3, a main frame-4, a low-speed disk type permanent magnet motor-5, a low-speed shaft brake-6, a variable pitch dragging system-7, a yaw dragging system-8, and a cabin cover-9. The wind turbine generator controls the running by a parameter self-study algorithm, and applies a BP neutral network to predict the control parameter pitch angle beta, rotate speed omega, torque q and power p of the control system, determines the control objective through the prediction value, and completes the speed change and the bending moment control. Compared with the traditional low-speed disk type permanent magnetic wind turbine generator, the middle-sized low-speed permanent magnetic direct drive wind turbine generator reduces the risk that the power generation is slipped down and even cannot generate power for the demagnetization caused by shock of the permanent magnetic motor, and decreases the main shaft and other bearing parts; the main frame can apply a lightweight welding structure, so that the production cost is reduced and the generator is simple to maintain.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a medium-sized low-speed permanent magnet direct-drive wind power generating set installed inside a nacelle with a low-speed disc permanent magnet motor. Background technique [0002] Compared with the widely used doubly-fed, AC asynchronous and semi-direct drive wind turbines, the low-speed permanent magnet direct-drive wind turbine eliminates the gearbox speed-up system and the gearbox lubricating oil pump used for the gearbox System, lubricating oil cooling, heating system, oil temperature, oil quality detection system, improve the reliability of the whole unit and reduce the maintenance workload. At the same time, due to the further maturity of magnetic steel materials, design, and production technology, the proportion of wind turbines using low-speed disc permanent magnet generators in wind turbines is on the rise. [0003] The permanent magnet mot...

AI Technical Summary

Problems solved by technology

Therefore, the general mandrel is very thick to meet the structural strength requirements, and the main frame is mostly a thick casting structure (due to the fluidity of liquid metal, castings of similar size should not be made into thin-walled structures) and such structures are used in small and medium-sized Medium-sized wind turbines (100KW~500KW) produced in batches (such as a dozen or dozens) will not be able to meet cost control requirements

[0006] The traditional disc-type low-speed permanent magnet generator is exposed to the outside of the engine room, directly exposed to wind, sun, rain, and chemical corrosion. It has high requirements on the protection performance of the motor and increases the production cost of the generator.

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