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Out-of-step protection method for synchronous motor

A synchronous motor, out-of-step protection technology, applied in the direction of automatic disconnection emergency protection device, emergency protection circuit device, electrical components, etc. Parking accidents, improve the effect of out-of-step protection

Inactive Publication Date: 2010-08-18
SHANGHAI DIANJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This protection method is carried out after the motor is out of step. It is passive and cannot avoid the occurrence of motor out of step, which reduces the service life of the motor and affects production. Therefore, the protection of the motor is limited.

Method used

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  • Out-of-step protection method for synchronous motor
  • Out-of-step protection method for synchronous motor
  • Out-of-step protection method for synchronous motor

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Embodiment Construction

[0023] In order to better understand the technical content of the present invention, specific embodiments are given together with the attached drawings for description as follows.

[0024] The invention proposes a synchronous motor out-of-step protection method, which adjusts the voltage-frequency ratio output by the frequency converter according to the calculated change of the power angle, and effectively avoids out-of-step.

[0025] Please refer to figure 1 , figure 1 Shown is a flow chart of a synchronous motor out-of-step protection method in a preferred embodiment of the present invention. The synchronous motor out-of-step protection method that the present invention proposes, it comprises the following steps:

[0026] Step S10: measuring the stator voltage, current and power factor of the motor;

[0027] Step S20: Calculate the power angle of the motor according to the above measured parameter values;

[0028] Step S30: judging whether the power angle is within the s...

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Abstract

The invention provides an out-of-step protection method for a synchronous motor, which comprises the following steps of: measuring the voltage, current and power factor of a stator of the motor; calculating a power angle of the motor according to the measured parameter values; judging whether the power angle is within the range of safe operation or not; and regulating voltage-frequency ratio output by a frequency converter and controlling the power angle within the range of the safe operation when the power angle exceeds the range of the safe operation. In the out-of-step protection method for the synchronous motor, the voltage-frequency ratio output by the frequency converter is regulated according to the change of the calculated power angle so as to effectively avoid out of step.

Description

technical field [0001] The invention relates to the field of motor protection, and in particular to a synchronous motor out-of-step protection method. Background technique [0002] The so-called synchronous motor simply means that the speed of the rotating magnetic field of the stator is consistent with the actual speed of the rotor. The purpose of adding an excitation cabinet is to increase the driving force for the rotor and ensure the synchronous operation of the motor. The synchronous motor is subjected to impact load or disturbance, causing severe impact of stator current, excitation current and output torque, causing mechanical stress in the material of the corresponding part of the motor, affecting its mechanical strength and service life, and even causing damage to the equipment. Affecting the normal progress of production, this phenomenon is called out of step. The so-called out-of-step can simply be understood as the actual speed of the rotor is lower than the spe...

Claims

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Application Information

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IPC IPC(8): H02H7/08H02H3/48
Inventor 王爱元
Owner SHANGHAI DIANJI UNIV
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