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Online measuring method for high-voltage high-capacity asynchronous motor parameters

A technology of asynchronous motor and measurement method, which is applied in the field of power electronics, can solve the problems affecting the engineering practicability of the identification method, and achieve the effect of convenient operation

Inactive Publication Date: 2012-12-05
HUBEI SANHUAN DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These shortcomings affect the engineering practicability of these identification methods

Method used

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  • Online measuring method for high-voltage high-capacity asynchronous motor parameters
  • Online measuring method for high-voltage high-capacity asynchronous motor parameters
  • Online measuring method for high-voltage high-capacity asynchronous motor parameters

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0041] An online measurement method for parameters of a high-voltage large-capacity asynchronous motor, comprising the following steps,

[0042] Step 1. The single-phase AC power output by the high-voltage frequency converter is connected to two phase input terminals of the asynchronous motor under test, and the other phase input terminal of the asynchronous motor under test is open circuit, wherein the asynchronous motor is a three-phase asynchronous motor;

[0043] Step 2. Set the frequency of the single-phase AC power supply to ω 1 , measure the two-phase voltage effective value U and current effective value I of the asynchronous motor connected to the single-phase AC power supply, and the frequency of the single-phase AC power supply is ω 1 The positive sequence impedance and active power P of the asynchronous motor 1 and reactive power Q 1 ;

[0044] The positive sequence impedance of an asynchronous motor is based on the following formula:

[0045] ...

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Abstract

The invention discloses an online measuring method for high-voltage high-capacity asynchronous motor parameters. The online measuring method comprises the following steps of: connecting the single-phase alternating-current power output by a high-voltage frequency converter with the input ends of the two phases of an asynchronous motor to be measured; opening the input end of another phase of the asynchronous motor to be measured; setting four different frequencies of the output single-phase alternating-current power; measuring a voltage effective value and a current effective value at each frequency to obtain the forward-field impedance of the asynchronous motor at the four different frequencies; obtaining quaternion equations according to the relationship between the forward-field impedance of the asynchronous motor and power frequency, stator resistance, rotor resistance, stator leakage inductance and excitation inductance; and obtaining parameters of the asynchronous motor to be measured by solving the quaternion equations. According to the online measuring method, relevant parameters of the high-capacity high-voltage asynchronous motor can be measured conveniently and accurately on a user site by utilizing an asymmetric stable short-circuit experiment without disconnecting a load and a stall on a motor shaft.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and more specifically relates to an online measurement method for parameters of a high-voltage and large-capacity asynchronous motor, which is suitable for industrial sites. Background technique [0002] At present, high-voltage and large-capacity asynchronous motors are commonly used to drive various loads in many fields of engineering. Due to technological needs or energy saving, asynchronous motors are required to achieve smooth speed regulation in a wide range, and have the advantages of fast dynamic response and high static precision. For this reason, vector control technology is generally used in frequency conversion speed regulation. When the vector control is adopted in the frequency conversion speed regulation of the asynchronous motor, in order to realize the decoupling of the excitation component and the torque component of the stator current and ensure the accurate orientat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34
Inventor 王宏英毕平劲范少春龚世缨
Owner HUBEI SANHUAN DEV
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