Motor thyristor soft-starting control method and application thereof

A motor and soft start technology, applied in the field of power electronics, can solve problems such as overcompensation, system undercompensation, overvoltage faults of motor protection devices, etc., and achieve the effect of avoiding undercompensation or overcompensation, and avoiding overvoltage faults

Inactive Publication Date: 2016-04-27
ZHUZHOU NAT ENG RES CENT OF CONVERTERS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In view of this, the object of the present invention is to provide a motor thyristor soft start control method and its application, which can effectively overcome the overvoltage fault of the motor pr

Method used

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  • Motor thyristor soft-starting control method and application thereof
  • Motor thyristor soft-starting control method and application thereof
  • Motor thyristor soft-starting control method and application thereof

Examples

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Embodiment 1

[0054] A specific embodiment of a motor thyristor soft start control method, in the soft start process of the motor 4, before the current output from the soft start device 3 to the motor 4 reaches a set constant value, the rate of increase of the starting current of the motor 4 is determined according to the time period Perform segment control. The motor thyristor soft-start control principle in which the starting current described in the specific embodiment of the present invention is a stepped waveform is: in the starting process of the motor 4, the size of the thyristor conduction angle in the soft starter 3 is controlled by the control system, so as to achieve continuous change The stator voltage of the motor 4 limits the starting current of the motor 4 and maintains a constant process. Preferably, the soft starter 3 further controls the rising rate of the starting current of the electric motor 4 in sections according to time periods through closed-loop control (digital PI...

Embodiment 2

[0075] as attached Image 6 As shown, a specific embodiment of the application of the above-mentioned method in the motor soft-start control system, when the grid generator is a synchronous motor, the thyristor soft-start device is used in the starting process of the motor 4, and the synchronous generator 1 in the system The process of generating electricity must be regulated by excitation. The motor soft start control system includes: a synchronous generator 1 , a high voltage switch cabinet 2 , a soft start device 3 , a motor 4 , an excitation power unit 5 and an automatic excitation controller 6 . The automatic excitation controller 6 is connected with the stator of the synchronous generator 1 through the excitation power unit 5 to control the excitation current of the synchronous generator 1 . The output voltage terminal of the synchronous generator 1 is connected to the high voltage switchgear 2 , the high voltage switchgear 2 is connected to the soft starter 3 , and the...

Embodiment 3

[0082] as attached Figure 7 As shown, another specific embodiment of the application of the above-mentioned method in the motor soft start control system, the motor soft start control system includes: high voltage switchgear 2, soft start device 3, motor 4 and reactive power compensation device 7, motor 4 It is a high-power or super-high-power motor. One end of the high-voltage switchgear 2 is connected to the high-voltage power supply 8 , and the other end is connected to the soft starter 3 , which controls the starting current of the motor 4 . One or more groups of reactive power compensation devices 7 are connected in parallel between the high voltage switchgear 2 and the soft starter 3 .

[0083] As a typical specific embodiment of the present invention, during the soft start process of the motor 4, the starting current increases stepwise and lasts for a period of time, so that the starting current increases slowly and regularly, and the reactive power of the motor 4 inc...

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Abstract

The invention discloses a motor thyristor soft-starting control method and an application thereof. During the soft-starting process of a motor, a rising rate of a starting current of the motor is subjected to segmented control according to time periods by adopting a closed-loop control method before a current output by a soft-starting device to the motor reaches a set constant value. When a power grid generator is a synchronous motor, the motor thyristor soft-starting control method is applied and can effectively solve the technical problem that a motor protection device on a high-voltage switch cabinet warns about overvoltage faults because a soft-starting control method of the existing thyristor soft-starting control device is likely to cause increased exciting current and overhigh voltage output of the motor end. When the motor thyristor soft-starting control method is applied to a high-power or super-power motor soft-starting control system, the technical problems of under-compensation or over-compensation of the system which easily occur in the prior art can be solved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a method for soft-starting control of a motor thyristor by using a ladder waveform and its application. Background technique [0002] With the maturity of the development of power electronics technology, the application of motor thyristor soft starters is becoming more and more popular. At present, the starting control methods of motor thyristor soft starters generally include: constant current start, ramp voltage start, sudden jump plus constant current start, sudden jump Add ramp start, etc. However, when some generator sets are independent power supply systems of synchronous generators, or when super-high-power motors start, it is necessary to use a combination of thyristor soft starter and static compensation device, the high-voltage motor thyristor soft starter adopts the above-mentioned common starting control method , it is difficult to meet the working conditio...

Claims

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Application Information

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IPC IPC(8): H02P1/16
Inventor 黄欢吴强罗仁俊陈刚雷立熊强汪小梅林丽叶春明尹烨铮龙致远王世平何伯钧邓霆王博王飞鹏邓飞李庆武周清华张得祥
Owner ZHUZHOU NAT ENG RES CENT OF CONVERTERS
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