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Identification method of stator and rotor resistance for asynchronous motor without speed sensor

A technology without speed sensor and stator resistance, which is applied in the field of power electronics and electric transmission, to achieve the effects of short time, improved control accuracy and performance, and small torque

Active Publication Date: 2020-12-29
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a speed sensorless control stator and rotor resistance identification method of an asynchronous motor to solve the defects in the prior art

Method used

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  • Identification method of stator and rotor resistance for asynchronous motor without speed sensor
  • Identification method of stator and rotor resistance for asynchronous motor without speed sensor
  • Identification method of stator and rotor resistance for asynchronous motor without speed sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0033] figure 1 The flowchart of a method for identifying the stator and rotor resistance of an asynchronous motor without speed sensor control provided by this embodiment, refer to figure 1 , the method includes:

[0034] S1 estimates the equivalent resistance of the free-rotating motor impedance based on high-frequency current injection, and obtains an estimated value of the equivalent resistance through integral processing and low-pass filtering.

[0035] Vector control is adopted in the rotating asynchronous motor, and the output frequency of the inverter is set to a fixed high frequency, which is higher than the rated fundamental frequency of the motor. The closed-loop control is used to make the three-phase current of the motor a high-frequency AC, and the impedance of the rotating motor The equivalent resistance is estimated, and the estimated value of the equivalent resistance is output through a low-pass filter.

[0036] figure 2 It is a schematic diagram of the e...

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Abstract

The invention provides an asynchronous motor speed sensorless control stator and rotor resistance identification method, belongs to the power electronics and power transmission and rail transit field,and aims at solving a problem that simultaneously identification of a rotating speed and a rotor resistance under speed sensorless control is difficult. The method is characterized by based on high frequency current injection, estimating a free rotating motor impedance equivalent resistance, and obtaining an equivalent resistance estimated value through integral processing and low-pass filteringprocessing; changing an injection mode into the direct current injection, estimating a stator resistance of an asynchronous motor, and obtaining a stator resistance estimated value through the integral processing and the low-pass filtering processing; and calculating a rotor resistance estimated value according to the equivalent resistance estimated value, the stator resistance estimated value anda motor rotating speed. The method is used for updating motor parameters in vector control and the motor parameters used in rotating speed identification, control precision of a speed sensorless device is improved, in a current injection process, a torque exerted by an actual motor is small, and operation of a train is not affected.

Description

technical field [0001] The invention relates to the technical field of power electronics and electric transmission, in particular to a speed sensorless control stator and rotor resistance identification method of an asynchronous motor. Background technique [0002] At present, the widely used asynchronous motor control strategy generally adopts vector control. In order to improve the reliability of the system and reduce the maintenance cost of the system, the speed sensorless control technology is usually used. Accurate speed estimation is fundamental to speed sensorless control, but the result of speed estimation is often affected by various motor parameters. Generally, the resistance of the stator and rotor of an asynchronous motor changes due to the operating conditions of the motor and changes in the temperature of the motor, resulting in a decrease in the performance of the speed sensorless control. [0003] When the speed sensorless control technology is applied to ra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/24H02P21/14
CPCH02P21/14H02P2207/01H02P21/24
Inventor 尹少博刁利军蒙东毅薛亚茹王磊武琦雅刁利坚
Owner BEIJING JIAOTONG UNIV