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Asynchronous motor vector control method based on variable parameter MRAS method

A technology of asynchronous motor and vector control, which is applied in the direction of vector control system, motor generator control, electronic commutation motor control, etc. It can solve the problems of large speed identification error and slow convergence speed, etc. The effect of convergence speed

Inactive Publication Date: 2018-01-30
申茂军
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Problems solved by technology

[0004] In order to overcome the problems of slow convergence speed and large speed identification error at low speeds of the conventional MRAS method, the present invention proposes a vector control method for asynchronous motors based on variable parameter MRAS method

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  • Asynchronous motor vector control method based on variable parameter MRAS method
  • Asynchronous motor vector control method based on variable parameter MRAS method
  • Asynchronous motor vector control method based on variable parameter MRAS method

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Embodiment Construction

[0016] specific implementation plan

[0017] figure 1 In this method, the first-order inertial filter link is used to replace the pure integral link, which is an effective combination of a pure integrator and a first-order high-pass filter. The resulting amplitude and phase errors of the observed flux linkage of the rotor are compensated by the actual excitation current or the actual rotor flux linkage, which can improve the dynamic performance of the system. In this model, the rotor flux current model based on the rotor flux orientation coordinate system is added to the front end of the compensation amount generation channel, that is, the excitation current i sd , to adapt to dynamic excitation changes. The improved voltage model method can eliminate the amplitude and phase errors of flux linkage.

[0018] The present invention adopts the actual excitation current i sd Instead of using the reference value of the excitation current Compensate the flux linkage amplitude a...

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Abstract

The invention discloses an asynchronous motor vector control method based on a variable parameter MRAS method. The method comprises three portions of rotor flux linkage observation, variable parameterPI adjusting and asynchronous motor vector control. In the invention, based on a conventional MRAS method, an improved voltage model method flux linkage observer is taken as a reference model. In order to overcome disadvantages that a response speed of the system and rotating speed identification errors at a low speed are large, a segment variable parameter PI adjuster is used to replace a traditional PI adjuster. Simulation and experiment show that by using improved voltage model method flux linkage observation, problems of integration drift and a large low speed detection fluctuation are overcome; and compared to the conventional MRAS method, by using variable parameter MRAS method rotating speed identification, overshoot is reduced, a convergence speed is accelerated, an identificationerror is reduced, rotating speed identification is accurate at a low speed and there are many other advantages.

Description

Technical field [0001] The invention relates to a control method of an asynchronous motor, in particular to a vector control method of an asynchronous motor based on a variable parameter MRAS method. Background technique [0002] In the high-performance vector control and direct torque control algorithms of asynchronous motors, the speed sensor is almost an indispensable detection device. Its use increases system cost, reduces reliability, and limits the application in harsh environments. Therefore, the speed sensorless technology has become a hot spot in current research on motor control. [0003] The key problem of speed sensorless technology is the identification of flux linkage and rotational speed, and the identification error of flux linkage and rotational speed directly affects the performance of the motor. At present, the widely used methods for rotor flux observation include voltage model method, current model method and hybrid model method based on the two. The s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/13H02P21/00H02P21/26
Inventor 申茂军
Owner 申茂军
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