Method and device for starting megawatt-level double-fed motor

A doubly-fed motor and starting device technology, which is applied to the starter of a single multi-phase induction motor, motor generator/starter, single-grid parallel feeding arrangement, etc., can solve the problem of high system cost, impact, increased system cost, etc. problem, to achieve the effect of simple grid connection and speed regulation process, simple system structure and wide application range

Inactive Publication Date: 2011-08-17
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
View PDF3 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Megawatt double-fed (wound rotor) motors have disadvantages such as large instantaneous absorbed power, high instantaneous voltage and large current of the rotor when the rated voltage is suddenly added at zero speed. At present, the rotor series resistance or the low-power auxiliary motor is generally used. way to start
However, the rotor series resistor method still has a certain impact on the grid and the moto...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and device for starting megawatt-level double-fed motor
  • Method and device for starting megawatt-level double-fed motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0009] The present invention will be further described below in conjunction with the accompanying drawings.

[0010] It can be seen from the accompanying drawings that the present invention relates to a method for starting a megawatt-level doubly-fed (wound rotor) motor. (Voltage) generates a rotating magnetic field, so that the stator winding short-circuited by the stator short-circuit contactor generates an induced current and a stator magnetic field, so that the motor generates electromagnetic torque to drive the rotor to rotate, and realizes the zero-speed start of the doubly-fed (wound rotor) motor.

[0011] As one of the specific implementations of the above method, on the basis of a conventional doubly-fed (wound rotor) motor rotor side frequency converter to realize the frequency conversion speed control device of the motor, by adding a stator short-circuit contactor 5 on the stator side, when After the rotor speed reaches the flexible grid-connected speed of the doubl...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a method and device for starting a megawatt-level double-fed motor. A frequency converter at a rotor side of an existing double-fed motor is utilized to control a rotor current (voltage) to generate rotating magnetic fields, so that stator windings which are subjected to short circuit by a stator short-circuit contactor generate an induced current and stator fields, thus the motor generates electromagnetic torques to drive rotors to rotate, thereby realizing zero-speed start of the double-fed motor. In the invention, the frequency converter at the rotor side of the existing double-fed motor is utilized to realize flexible start of the motor, and the stator short-circuit contactor is added. Compared with a rotor series resistance method or stand-by motor dragging method and the like, the method provided by the invention is low in cost, and has no impact on a power grid. Because only one stator short-circuit contactor is added, the system structure is simple, the processes of motor startup, synchronization and speed adjustment are simple without the impact cohesion, and are automatically and completely controlled by a converter, thus the complete automation is realized and the reliability is high.

Description

technical field [0001] The invention relates to a method and device for starting a motor, in particular to a method and device for starting a doubly-fed motor in a full-power test platform of a megawatt-class doubly-fed wind power generating set, which is mainly used for starting a doubly-fed motor in a laboratory environment The motor is used for converter and generator power tests, and it can also be used for the start-up of fan and water pump type wound motors equipped with rotor-side converter speed control devices. technical background [0002] Megawatt double-fed (wound rotor) motors have disadvantages such as large instantaneous absorbed power, high instantaneous voltage and large current of the rotor when the rated voltage is suddenly added at zero speed. At present, the rotor series resistance or the low-power auxiliary motor is generally used. way to start. However, the rotor series resistor method still has a certain impact on the power grid and the motor, and re...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H02P1/28H02P1/30H02J3/38
Inventor 佘岳郭知彼盛建科郑锡芳徐凤星邬冬临王莹王新泽刘憾宇胡婵娟李远琼
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap