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On-line identification method of rotor time constant of asynchronous motor based on improved reactive power model

A technology of rotor time constant and asynchronous motor, which is applied in the direction of control of generator, motor generator control, electronic commutation motor control, etc., to achieve the effect of easy setting of parameters

Inactive Publication Date: 2018-06-15
HEFEI UNIV OF TECH
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Problems solved by technology

[0008] The purpose of the present invention is to provide an online identification method for the rotor time constant of asynchronous motors based on the improved reactive power model in view of the problems existing in the existing rotor time constant identification method based on the reactive power model

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  • On-line identification method of rotor time constant of asynchronous motor based on improved reactive power model
  • On-line identification method of rotor time constant of asynchronous motor based on improved reactive power model
  • On-line identification method of rotor time constant of asynchronous motor based on improved reactive power model

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Embodiment Construction

[0045] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0046] see figure 1 , the implementation process of the present invention is as follows:

[0047] Step 1: Collect the motor stator current d-axis component isd , q-axis component i sq and motor stator voltage d-axis component u sd , q-axis component u sq , get the actual reactive power Q of the motor through the actual reactive power calculation unit, where:

[0048] Motor stator current d-axis component i sd , q-axis component i sq It is the motor feedback current required by the motor indirect vector control system to establish the current closed-loop control, which is obtained by sampling the three-phase current of the motor stator and undergoing synchronous coordinate transformation;

[0049] Motor stator voltage d-axis component u sd , q-axis component u sq is the output value of the motor indirect vector control current loop proportio...

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Abstract

The invention discloses an online identification method for the rotor time constant of an asynchronous motor based on an improved reactive power model. The actual reactive power Q of the motor is obtained by the power calculation unit; the stator inductance Ls of the motor is obtained by the stator inductance calculation unit; the reference value isdref of the d-axis component of the motor stator current is obtained by the excitation controller; the theoretical reactive power Qref of the motor is obtained by the theoretical reactive power calculation unit Obtain the motor reactive power deviation ΔQ through the deviation calculation unit; obtain the feedforward value ωQ through the limiting unit; obtain the correction value ΔTr of the rotor time constant Tr through the proportional integral controller; obtain the rotor time constant Tr through the arithmetic operation unit. The invention can be directly applied to the four-quadrant operation occasion of the motor, and makes it easy to adjust the parameters of the proportional-integral controller in the reactive power model, and can obtain similar dynamic processes of rotor time constant convergence at high and low speeds of the motor.

Description

technical field [0001] The invention relates to the field of motor control, in particular to an online identification method for the rotor time constant of an asynchronous motor based on an improved reactive power model. Background technique [0002] Indirect vector control of asynchronous motors is widely used in industry because of its simplicity, reliability, and fast response. In indirect magnetic field orientation, the rotor time constant is a key parameter. If the rotor time constant used for orientation control is inconsistent with the actual value of the motor, it will lead to inaccurate motor field orientation, coupling of the motor stator current flux component and torque component, etc. . During the operation of the motor, the change of excitation and temperature will cause the rotor time constant to change continuously. The rotor inductance in the rotor time constant that changes with the change of motor excitation can be adjusted online after offline calibratio...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/16
Inventor 张兴曹朋朋杨淑英谢震郭磊磊李浩源
Owner HEFEI UNIV OF TECH
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