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Automatic quasi-synchronization grid-connected control method for automatic-control frequency conversion soft start of medium-high pressure synchronous motors

An automatic quasi-synchronous and synchronous motor technology, applied in the direction of AC motor control, slip frequency control, control system, etc., can solve the problems of unstable phase angle slip and irregular fluctuation of speed, so as to improve reliability and avoid slippage. bad unstable effect

Active Publication Date: 2014-01-22
HARBIN INST OF TECH
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Problems solved by technology

[0005] In order to solve the problem that in the double-closed-loop speed regulation system, when the current inner loop has a nonlinear dead zone factor, the use of the speed loop PI algorithm will cause irregular fluctuations in the rotational speed, resulting in instability of the phase angle slip, thus proposing An automatic quasi-synchronous grid-connected control method for medium and high voltage synchronous motors with self-controlled variable frequency soft start

Method used

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  • Automatic quasi-synchronization grid-connected control method for automatic-control frequency conversion soft start of medium-high pressure synchronous motors
  • Automatic quasi-synchronization grid-connected control method for automatic-control frequency conversion soft start of medium-high pressure synchronous motors
  • Automatic quasi-synchronization grid-connected control method for automatic-control frequency conversion soft start of medium-high pressure synchronous motors

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specific Embodiment approach 1

[0031] Specific implementation mode 1. Combination figure 1 Specifically explaining this embodiment, the automatic quasi-synchronous grid-connected control method for medium and high-voltage synchronous motor self-controlled variable frequency soft start described in this embodiment is: the quasi-synchronous frequency preset by the controller is given ω si Make the difference with the actual frequency ω of the motor to obtain the frequency △ω,

[0032] Input the frequency △ω into the selector and select through the selector:

[0033] If |△ω|≤△ω e , then the frequency △ω is input to the quasi-synchronous speed given regulator, and the frequency given ω of the speed regulator is obtained through the processing of the quasi-synchronous speed given regulator * ,

[0034] Among them, △ω e In order to enter the frequency error limit of quasi-synchronization,

[0035] If |△ω|>△ω e , then the frequency △ω is sent to the speed-up speed given regulator, and after being processed b...

specific Embodiment approach 2

[0046] Embodiment 2. The difference between this embodiment and the automatic quasi-synchronous grid-connected control method for medium and high voltage synchronous motor self-controlled variable frequency soft start described in Embodiment 1 is that the current given The specific process is:

[0047] Given by the frequency of the speed regulator ω * and the actual frequency ω of the motor to obtain the current given according to the formula (1)

[0048] ( ω * - ω ) K ω = i d * - - - ( 1 )

[0049] Among them, K ω Indicates the proportional coefficient of the speed regulator.

[0050] The synchronous motor starting grid-connected system can be divided into speed-up process, quasi-synchronous p...

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Abstract

The invention relates to an automatic quasi-synchronization grid-connected control method for automatic-control frequency conversion soft start of medium-high pressure synchronous motors, and aims to solve the problem that the phase angle slip frequency is unstable due to the fact that the speed ring PI algorithm is adopted to cause irregular fluctuation of rotating speed in a dual-closed-loop speed regulating system when a current inner ring has nonlinear dead zone factors. A self-adaptive composite speed control method is adopted, and a speed control algorithm of a single proportional component having the self-adaptive function in the speed rising phase is adopted to solve the problem that a proportional controller cannot overcome residual errors; an automatic quasi-synchronization algorithm of current resistance nonlinear dead zones is provided in the quasi-synchronization phase to guarantee the consistency of the slip frequency. The method provided by the invention is applied in the field of soft start of the synchronous motors.

Description

technical field [0001] The invention relates to the field of soft starting of synchronous motors. Background technique [0002] The difficulty in starting and grid-connecting medium-voltage high-power synchronous motors has become a major obstacle to its application and a major technical problem restricting industrial development. The automatic quasi-synchronization device is a very important part of the soft-starting device for large-scale synchronous motors. In order to avoid the inrush current of synchronous motors and damage the motors and mechanical equipment when connected to the grid, the amplitude, phase and frequency of the voltage at both ends of the grid-connected contactor must be consistent at the time of grid connection, and the phase of the back electromotive force of the motor is consistent with the phase of the grid very important. If the phase difference is large at the time of grid connection, it will cause great harm to the rotor shaft system, which will...

Claims

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Application Information

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IPC IPC(8): H02P23/08H02P27/04H02J3/40
Inventor 徐殿国金光哲高强寇佳宝张巍张鹏淼
Owner HARBIN INST OF TECH
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