A double-rotor permanent magnet double-fed wind generator and power generation system

Abstract

The invention provides a dual-rotor permanent-magnet doubly-fed wind power generator and a power generation system. A permanent-magnet outer rotor employs a magnetic conduction material of which an inner surface and an outer surface are pasted with permanent-magnet structures, and the positions of permanent magnets on the inner surface and the outer surface are corresponding to each other. By themagnet structure, the gap flux density of a motor gap can be improved, and the torque density of the motor is in direct proportion to the gas surface area and the gas flux density value of the motor;in the dual-rotor permanent-magnet doubly-fed wind power generator, the gas surface area is expanded, the additionally-arranged outer rotor magnets all employ special magnet structures, the gap flux density is improved, so that the torque density of the motor is improved; and with the adoption of an inner-rotor and outer-rotor structure of the dual-rotor permanent-magnet doubly-fed wind power generator, the gap flux density of the inner rotor and the outer rotor are improved, the flux density of yoke parts of the inner rotor and the outer rotor is reduced, so that the running efficiency and the torque density of the motor are improved, the gap flux density of the inner rotor and the outer rotor is in sine distribution, and a winding potential can be enabled to be in sine distribution.

Description

technical field [0001] The invention relates to the technical field of new energy power generation, in particular to a double-rotor permanent magnet double-fed wind power generator and a power generation system. Background technique [0002] Clean wind energy is one of the most dynamic renewable energy sources. Facing the dual pressure of energy crisis and deterioration of the earth's environment, the development and utilization of wind energy has attracted global attention. Traditional wind generators usually use permanent magnet synchronous generators or ordinary induction generators, but the above two generators cannot achieve variable speed and constant frequency operation, and the conversion efficiency of wind energy is low. In recent years, doubly-fed generators capable of variable-speed, constant-frequency and high-efficiency power generation have become a research hotspot in wind power generation. However, ordinary doubly-fed wind turbines also have prominent problem...

AI Technical Summary

Problems solved by technology

With the continuous improvement of the performance of rare earth permanent magnet materials, the research of using permanent magnets in the design of motors to improve the performance of motors continues to emerge. At present, permanent magnet motors used in wind power generation still have disadvantages such as complex power converters in power generation systems and high control costs.

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