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Induction motor resistance identification method suitable for metro converter

A technology for induction motors and identification methods, which is applied in the direction of control of generators, motor generators, electromechanical brakes, etc., can solve problems such as inaccurate output torque and inaccurate resistance parameters, and achieve inaccurate output torque, Guarantee the effect of dynamic response

Inactive Publication Date: 2018-11-13
BEIJING JIAOTONG UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide an induction motor resistance identification method suitable for subway converters, which can identify the stator resistance and rotor resistance, solve the problem of inaccurate resistance parameters, perform corresponding resistance parameter identification, and When stopping, execute the corresponding parameter offline identification command to obtain accurate motor parameters, thereby solving the problem of inaccurate output torque due to resistance parameters and ensuring the dynamic response of the system

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  • Induction motor resistance identification method suitable for metro converter
  • Induction motor resistance identification method suitable for metro converter
  • Induction motor resistance identification method suitable for metro converter

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Embodiment Construction

[0023] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.

[0024] refer to figure 1 , is the vector control control block diagram, the motor current i A i B After the three-phase stationary coordinate system to the two-phase vertical stationary coordinate system αβ axis, the transformation from the two-phase stationary coordinate system to the two-phase rotating coordinate system dq axis is completed through Park transformation, and the d-axis is oriented to the direction of the rotor magnetic field, that is, along the rotor The direction of the magnetic field is rotated, whereby i d The current component is called the excitation current component, and at the same time, the d...

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Abstract

The invention discloses an induction motor resistance identification method suitable for a metro converter. The identification method is based on a motor equivalent circuit model in a direct-current state, and a current closed-loop strategy is designed for identification of motor stator resistance; based on a motor equivalent model transfer function in a direct-current state, the transfer functionis analyzed to obtain the time of step response of the system, and after the response of the system is stable, parameters are calculated; based on a principle that the electric resistivity of the motor changes along with the temperature, the temperature is estimated according to the stator resistance, and then the resistance of the rotor is calculated according to the temperature. Therefore, themotor stator and rotor resistance parameters are obtained, and a foundation is provided for vector control and direct torque control; and the problem that output torque is inaccurate due to resistanceparameters is solved, and dynamic response of the system is guaranteed.

Description

technical field [0001] The invention relates to the technical field of power electronics, electric transmission and new energy. More specifically, it relates to an induction motor resistance identification method suitable for subway converters. Background technique [0002] In the frequency conversion and speed regulation of modern motors, vector control and direct torque control are two main motor control methods. Whether it is the decoupling of excitation current and torque current in vector control or the observation of flux linkage in direct torque control, both Rely on accurate motor parameters. Since the resistance temperature changes during the actual operation of the motor, the resistance of the motor changes, so it is difficult to ensure the current decoupling and flux linkage observation during the dynamic process, which affects the control effect and operating performance of the system. The traditional identification methods include no-load test and stall test, ...

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Application Information

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IPC IPC(8): H02P23/14H02P21/14
Inventor 陈杰唐敬漆凉波刘志刚邱瑞昌李庭
Owner BEIJING JIAOTONG UNIV
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