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Time constant identification method for induction motor rotor

A rotor time constant and induction motor technology, which is applied in the control of generators, motor generators, electronically commutated motors, etc., can solve problems that affect the accuracy of observation, system stability, unsatisfactory identification results, and integral drift.

Active Publication Date: 2018-04-10
XIAN UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

The voltage model contains a pure integral link, which will introduce integral drift and DC bias problems in the process of estimating the rotational speed, resulting in unsatisfactory identification of the system at low speeds, and affecting the accuracy of observations and system stability

Method used

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  • Time constant identification method for induction motor rotor
  • Time constant identification method for induction motor rotor
  • Time constant identification method for induction motor rotor

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Embodiment Construction

[0078] Such as figure 1 As shown, the induction motor rotor time constant identification method of the present invention includes the following steps:

[0079] Step 1, constructing the rotor flux linkage ESO (Extended State Observer, extended state observer) model of the induction motor;

[0080] The basic idea of ​​ESO (Extended State Observer) is to construct a new system state based on a given input, and then send it to the original system through nonlinear function processing to obtain the desired output.

[0081] In this embodiment, the specific process of constructing the rotor flux ESO model of the induction motor in step 1 is:

[0082] Step 101. Under the two-phase stationary coordinate system, the stator current and rotor flux linkage of the induction motor are used as state variables, and the state equation of the induction motor is constructed as:

[0083]

[0084]

[0085]

[0086]

[0087] Among them, ψ rα is the α-phase rotor flux linkage in the tw...

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Abstract

The invention discloses an time constant identification method for an induction motor rotor. The method comprises the steps of constructing a rotor flux ESO model of the induction motor; constructinga current model of the induction motor; deriving the self-adaptation law through a Popov superstability theorem; determining the time constant of the rotor of the induction motor, wherein the rotor flux ESO model is used as a reference model, the current model is used as an adjustable model, and the reciprocal (1 / T<^><R>) of the time constant of the rotor is estimated under the action of the self-adaptive law and sent into a current model to adjust the output flux value of the current model in real time, so that the output flux value of the current model follows the flux output of the rotor flux ESO model, and determining the output value as the time constant of the rotor of the induction motor when the flux values of the rotor output by the rotor flux ESO model and the current model are equal. The rotor time constant identification is accurate, and the magnetic field orientation and speed tracking precision of AN induction motor vector control system can be improved, the motor load disturbance robustness is high, and the motor rotating speed tracking precision is high.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a method for identifying the rotor time constant of an induction motor. Background technique [0002] The vector control technology can realize the decoupling control of torque and excitation, so that the AC motor can achieve the speed regulation performance similar to that of the DC motor. In the vector control system, accurate magnetic field orientation is essential, and an important factor affecting the magnetic field orientation is the accuracy of rotor parameters. When the motor works for a long time, the rotor resistance will increase with the increase of temperature, and the maximum change can reach more than 50%. The rotor inductance value will change with the magnetic saturation state, and the change value and the degree of magnetic saturation are nonlinear Therefore, the rotor time constant will change with the working state of the motor. When the rotor time con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P21/16
CPCH02P21/0017H02P21/16
Inventor 贺虎成牛春光柳彦钊王文婷师磊刘洽孙磊
Owner XIAN UNIV OF SCI & TECH
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