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Online identification method for inductance parameters of asynchronous motor

A technology of inductance parameter and identification method, applied in the control of generator, motor control, motor generator control, etc., can solve the negative effects of stability, reliability, rapidity and accuracy, increase the complexity of control system, control system Stability, reliability, rapidity and negative effects of accuracy, etc., to achieve the effects of excellent robustness, simple and efficient control strategy, and accurate orientation

Active Publication Date: 2020-04-17
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The obvious disadvantage of this type of method is that it greatly increases the complexity of the control system, and may even have serious negative effects on the stability, reliability, speed and accuracy of the control system.
[0004] 2. Various flux observation techniques, such as full-order state observers, sliding mode observers, Kalman filters, model reference observers, etc., still have various problems. In the research and experiment stage, there is still a long way to go for the accurate observation of the magnetic flux of the AC motor
Its obvious disadvantage is that it greatly increases the complexity of the control system, and may even have serious negative effects on the stability, reliability, speed and accuracy of the control system

Method used

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  • Online identification method for inductance parameters of asynchronous motor
  • Online identification method for inductance parameters of asynchronous motor
  • Online identification method for inductance parameters of asynchronous motor

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Embodiment

[0040] The invention relates to an on-line identification method of induction motor inductance parameters. The method is mainly to perform on-line identification of stator inductance parameters and magnetic flux leakage coefficients, which are realized by obtaining parameter information in the system in real time and performing a series of operations. In this embodiment, the current tracking type PWM inverter is used as an example to illustrate the present invention. figure 1 Shown. The method of the invention can also be applied to an asynchronous motor variable frequency speed regulation vector control system using a voltage source type SVPWM inverter.

[0041] The working principle of the present invention is:

[0042] Given by speed n * , The outer speed loop formed by the speed feedback n and the speed regulator obtains the slip angle frequency signal ω s After the load angle is corrected by the rotor field orientation module, the output slip compensation Δω s , Add the two to...

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Abstract

The invention relates to an online identification method for inductance parameters of an asynchronous motor. The method comprises the steps of 1) performing rotor magnetic field accurate orientation based on load angle compensation correction according to current and voltage signals under d-q synchronous rotation coordinates; 2) performing closed-loop adjustment on a d-axis flux linkage of a stator under the condition of the accurate orientation of a rotor magnetic field; 3) carrying out online identification on stator inductance parameters under the conditions of the accurate orientation of the rotor magnetic field and the closed-loop adjustment of the stator d-axis flux linkage; and 4) under the conditions of the rotor magnetic field accurate orientation and the stator d-axis flux linkage closed-loop adjustment, carrying out online identification on a magnetic flux leakage coefficient, and feeding back a result of online identification of the magnetic flux leakage coefficient to therotor magnetic field accurate orientation. Compared with the prior art, the method does not need to introduce a complex, tedious, time-consuming and resource-consuming algorithm, does not need specialhardware support, can achieve the quick and accurate online recognition of the stator inductance and the magnetic flux leakage coefficient, and guarantees the real-time accuracy of inductance parameters needed by a vector control system.

Description

Technical field [0001] The present invention relates to the technical field of asynchronous motor control, in particular to an on-line identification method of asynchronous motor inductance parameters. Background technique [0002] Asynchronous motor variable-frequency variable-speed rotor field-oriented vector control can transform the inherent nonlinear mechanical characteristics of asynchronous motors into linear mechanical characteristics similar to DC motors, and the current and flux linkage are completely decoupled to achieve the speed control of DC motors. Basic conditions for good performance. Therefore, rotor field orientation is the most worthy of in-depth study and perfect control technology in asynchronous motor vector control. However, in the decades of development of the rotor field-oriented vector control technology, due to the large changes of the motor rotor resistance Rr and time constant Tr with different operating conditions and temperature, the rotor field o...

Claims

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Application Information

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IPC IPC(8): H02P21/16
CPCH02P21/16H02P2207/01
Inventor 梅柏杉刘涛李晓华孙改平
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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