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Voltage model stator flux linkage estimation method

A technology of stator flux linkage and voltage model, which is applied in the direction of electronic commutation motor control, electrical components, control generators, etc., can solve the problem of inability to take into account the observation speed and accuracy of flux linkage, etc., so as to improve the dynamic response speed and eliminate DC bias. set effect

Active Publication Date: 2018-05-25
HEFEI UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to propose a novel improvement scheme in order to overcome the problem that the existing improved voltage model flux linkage observation method cannot take into account the flux linkage observation speed and accuracy

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  • Voltage model stator flux linkage estimation method

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Embodiment Construction

[0039] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0040] figure 1 The flow chart that is carried out for the present invention, figure 2 Propose the realization block diagram of algorithm for the present invention, by figure 1 , figure 2 As shown, the embodiment of the present invention includes the following steps:

[0041] Step 1: Collect the stator frequency ω of the asynchronous motor e , the stator voltage component u in the stationary αβ coordinate system sα , u sβ and the stator current component i in the stationary αβ coordinate system sα i sβ , according to the formula (1) to calculate the back induced electromotive force e of the stator sa 、e sβ ;

[0042]

[0043] where R s is the stator resistance.

[0044] Stator voltage component u in the static αβ coordinate system sα , u sβ There are two collection methods:

[0045] The first one is to obtain the ...

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Abstract

The invention discloses a novel improved voltage model stator flux linkage estimation method. The method comprises the steps: obtaining stator counter induced electromotive forces ys(alpha) and ys(beta) comprising DC components through a DC bias elimination module according to the collected and calculated asynchronous motor stator counter induced electromotive forces and stator angular frequency in a stationary coordinate system; finally obtaining an estimated alpha-axis stator flux linkage (shown in the description) and an estimated beta-axis stator flux linkage (shown in the description) through a flux linkage calculation module. Compared with a conventional technical scheme, the method is advantageous in that 1, the method solves a problem of DC bias and steady-state error of a voltagemodel flux linkage observer; 2, the method is higher in dynamic response speed of flux linkage estimation.

Description

technical field [0001] The invention relates to a flux linkage observer, in particular to a novel improved voltage model stator flux estimation method. Background technique [0002] Accurate observation of the flux linkage of asynchronous motors has always been a key issue in the high-performance control of motors. Using the observed flux linkage can realize the estimation of parameters such as motor speed and torque, and then realize the closed-loop control of the motor without speed and torque. The flux linkage observation scheme based on pure voltage integral is favored by people because of its simple structure and easy implementation. However, in practical applications, the pure integral problem inherent in the voltage model limits the accuracy of flux linkage observation. Aiming at this problem, scholars at home and abroad have proposed a series of improvement schemes. [0003] The article entitled "Improvement of the low-pass filter of the stator flux observer" (He ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/13H02P21/14
CPCH02P21/13H02P21/141H02P2207/01
Inventor 张兴张雨薇曹朋朋杨淑英谢震
Owner HEFEI UNIV OF TECH
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