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Method and device for controlling closing and opening overvoltage suppression of doubly-fed motor stator

A doubly-fed motor and control method technology, which is applied in the direction of AC motor control, emergency protection circuit device, control system, etc., can solve the problems of increasing system maintenance cost and difficulty, unable to achieve real-time detection, etc., so as to avoid impact and enhance function, the effect of improving safety

Active Publication Date: 2021-04-30
CHAJNA MAJNING DRAJVS EHND AUTOMEHJSHN KO
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Manual inspection increases the maintenance cost and difficulty of the system, and it cannot be detected in real time

Method used

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  • Method and device for controlling closing and opening overvoltage suppression of doubly-fed motor stator
  • Method and device for controlling closing and opening overvoltage suppression of doubly-fed motor stator
  • Method and device for controlling closing and opening overvoltage suppression of doubly-fed motor stator

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Embodiment Construction

[0058] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below in conjunction with the drawings in the embodiments of the present invention.

[0059] Aiming at the rotor overvoltage problem caused by the asynchronous closing of the stator of the doubly-fed motor, the embodiment of the present invention provides a control method for suppressing the overvoltage of the stator closing and opening of the doubly-fed motor. The flow chart is as follows figure 1 As shown, the method includes,

[0060] Step S0: start and stop commands of the doubly-fed motor control system issued by the real-time acquisition system.

[0061] Step S1: According to the start and stop commands issued by the system, control the closing sequence of the switches during the closing process of the double-fed motor stator, and the opening sequence of the switch...

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Abstract

The invention discloses a method and s device for controlling closing and opening overvoltage suppression of s doubly-fed motor stator. The method comprises the following steps: acquiring a doubly-fed motor control system starting and stopping command sent by a system in real time; controlling the closing sequence of each switch in the closing process of the doubly-fed motor stator and the opening sequence of each switch in the opening process according to the starting and stopping commands sent by the system; wherein the switch comprises a stator power switch and a controllable isolation unit switch; monitoring the state of each switch in the switching-on and switching-off processes of the stator of the doubly-fed motor, and judging whether each switch has a fault or not; wherein the faults comprise a stator power switch abnormal working fault and a controllable isolation unit switch abnormal working faults and and if a fault occurs, the system stops working. The peak voltage generated in the stator closing process is effectively suppressed through the controllable isolation unit switch, so that the peak voltage is isolated from the frequency converter on the rotor side, and the impact of the stator closing peak voltage on a frequency converter power semiconductor device connected with the rotor side is avoided.

Description

technical field [0001] The invention relates to the field of transmission control of electromechanical equipment, in particular to a control device and method for suppressing overvoltage of the stator closing of a doubly-fed motor. Background technique [0002] The stator side of the double-fed motor is powered by a commercial frequency power supply, and the rotor side is powered by a frequency converter. By controlling the frequency converter on the rotor side, the stator and rotor of the double-fed motor can be controlled to achieve bilateral energy feed-in and feed-out. The industrial frequency power supply to the stator side is controlled by a contactor. When the rated voltage of the stator side is 6 kV or 10 kV, the three-phase power supply to the stator side is controlled by three independent vacuum contactors. Although the vacuum contactor has strict standards to limit the pull-in and break-off time, in the application of frequent power on and off, the pull-in and bre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/09H02H7/08H02P27/05
CPCH02H7/09H02H7/0844H02P27/05
Inventor 杨波谭国俊叶宗彬吴翔
Owner CHAJNA MAJNING DRAJVS EHND AUTOMEHJSHN KO
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