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Electromagnetic gearbox for doubly-fed wind driven generator and control method of electromagnetic gearbox

A technology of wind turbines and magnetic gears, applied in electrical components, electromechanical devices, electric components, etc., can solve the problem of not being able to change the speed change ratio in real time, affecting the application and promotion of wind power generation systems, etc., to improve system reliability and flexibility, The effect of light weight and lower operation and maintenance costs

Pending Publication Date: 2021-05-28
QUFU NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing magnetic gear cannot change the transmission ratio in real time, which affects its application and promotion in wind power generation systems

Method used

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  • Electromagnetic gearbox for doubly-fed wind driven generator and control method of electromagnetic gearbox
  • Electromagnetic gearbox for doubly-fed wind driven generator and control method of electromagnetic gearbox
  • Electromagnetic gearbox for doubly-fed wind driven generator and control method of electromagnetic gearbox

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Embodiment Construction

[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0032] Such as figure 1 Shown, the doubly-fed wind power generation system that the present invention adopts comprises wind wheel 6 and main shaft 61 thereof, electromagnetic gear box of the present invention, coupling 7 and doubly-fed wind power generator 8; Electromagnetic gear box of the present invention includes: the first The first-stage planetary electromagnetic gear 1, the second-stage coaxial magnetic gear 2, the third-stage coaxial magnetic gear 3, and the main control system.

[0033] Such as figure 1 , figure 2 As shown, the first stage planetary electromagnetic gear 1 includes: electromagnetic ring gear 11, planetary magnetic gear 13, planet carrier 14, sun magnetic gear 12, first stage driving shaft 4, first stage driven shaft; electromagnetic ring gear 11 consists of The ring gear iron core 111 and the DC winding 112 are composed; the first...

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Abstract

The invention relates to an electromagnetic gearbox for a doubly-fed wind driven generator and a control method of the electromagnetic gearbox, and belongs to the field of wind power. The electromagnetic gearbox comprises a first-stage planetary electromagnetic gear, a second-stage coaxial magnetic gear and a third-stage coaxial magnetic gear. The first-stage planet electromagnetic gear comprises an electromagnetic gear ring, a planet magnetic gear, a planet carrier, a sun magnetic gear and the like; and the electromagnetic gear ring is composed of an iron core and a winding. The control method comprises the following steps that the polarity of the electromagnetic gear ring winding is controlled, so that the number of pole pairs of the electromagnetic gear ring during starting is half of the rated number of pole pairs, and the number of pole pairs of the electromagnetic gear ring after starting is the rated number of pole pairs; when the wind speed is greater than the rated wind speed, the winding current of the electromagnetic gear ring is adjusted so as to adjust the output torque of the first-stage planetary electromagnetic gear, and constant power control is achieved; and when the wind speed is great than the cut-out wind speed, a winding power supply of the electromagnetic gear ring is cut off, decoupling of the wind wheel and the generator is achieved, and braking force of the generator is reduced. The operation and maintenance cost can be reduced; and the speed increasing ratio can be adjusted in real time, and the system operation flexibility can be improved.

Description

technical field [0001] The invention relates to a gear box and a control method thereof, in particular to an electromagnetic gear box for a double-fed wind power generator and a control method thereof, belonging to the technical field of wind power generation. Background technique [0002] A doubly-fed wind power generation system is mainly composed of a wind rotor, a gearbox, a doubly-fed wind generator (DFIG), and a converter system. DFIG is a high-speed, small-sized generator. Since the wind rotor operates at low speed, a gearbox with a high speed ratio is usually used to increase the lower speed of the wind rotor to the high-speed generator rotor speed. However, the existing gearbox uses mechanical gear meshing, which requires a complex oil injection lubrication system, which is large in size, heavy, high in cost, loud in noise, high in failure rate, and requires regular maintenance. In addition, the main loss of doubly-fed wind power generation system comes from the ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K51/00
CPCH02K51/00
Inventor 蔡彬张健秦清海褚晓广汲柏良
Owner QUFU NORMAL UNIV
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