Constant frequency exciting method for telescope double rotor fan speed changing and its control system

Abstract

Being rotated to stator relatively, permanent magnet inner rotor driven by counter drive shaft (CDS) is configured on CDS of generator. Being rotated to stator relatively, ring shaped rotor driven by main drive shaft (MDS) is configured on MDS of generator. The ring shaped rotor is in structure and configuration of surrounding the inner rotor, and rotating around the inner rotor. Possessing Pg pair of pole, and Nzr rotating speed under action of wind power, main wind wheel is collocated on MDS. Subsidiary wind wheel collocated on end of CDS drives reverse rotary of the inner rotor in Ne speed related to the main wind wheel. Features are: operation in variable speed constant frequency (VSCF), adjustable airscrew pitch, no gear case and direct driving, no need of convertor assembly in large capacity so as to raise reliability greatly. Comparing with single wind wheel VSCF set, the dual wind wheels VSCF set raises use ratio of wind energy largely.

Description

technical field [0001] The invention relates to a wind power generator, in particular to a variable-speed constant-frequency excitation method with a telescoping double-rotor excitation structure and a control system thereof. Background technique [0002] Known technology such as Chinese patent CN200510022771.1 discloses a variable-speed constant-frequency method for wind power generation, which is characterized in that first, the speed of the wind turbine rotor is increased through the speed-increasing gearbox, and then the input power generated by the variable speed is input into the differential The input shaft of the permanent magnet motor is divided or merged by the differential mechanism of the differential permanent magnet motor to generate power flow into the stator winding of the differential permanent magnet motor through the feeder to realize constant speed and constant frequency power generation to the power grid, so as to improve the power generation system. pow...

AI Technical Summary

Problems solved by technology

[0005] It is known that the wind turbine transmits the power generated by the wind rotor under the action of the wind to the generator through the gearbox and makes it obtain a corresponding speed; usually the speed of the wind rotor is very low, which is far below the power generation required by the high-speed generator The speed must be realized through the acceleration of the gear pair of the gearbox; while the working conditions of the wind turbine unit are generally very poor, frequent failures of the gearbox are common

[0006] Products manufactured by conventional technologies have poor reliability, high maintenance costs, and low unit efficiency

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