Method for observing rotor magnetic chain based on cross feedback double compensation method

A technology of rotor flux linkage and double compensation, which is applied in the direction of electronic commutation motor control, generator control, control system, etc., can solve the problems of difficult to determine coefficients and fixed coefficients, and achieve good results

Inactive Publication Date: 2012-07-11
HENAN UNIV OF SCI & TECH
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Problems solved by technology

The conventional compensation method is only suitable for a certain speed r...

Method used

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  • Method for observing rotor magnetic chain based on cross feedback double compensation method
  • Method for observing rotor magnetic chain based on cross feedback double compensation method
  • Method for observing rotor magnetic chain based on cross feedback double compensation method

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Embodiment Construction

[0015] As shown in the figure, an observation method of rotor flux linkage based on quadrature feedback double compensation method,

[0016] Step 1. Signal conditioning: the three-phase voltage and current components collected from the sensor are filtered through the detection circuit to remove the interfering glitch signal;

[0017] Step 2. The signal from the detection circuit enters the DSP for A / D conversion, and after digital quantization, it performs 3s / 2s conversion, and converts from the three-phase static system to the two-phase static coordinate system;

[0018] Step 3. Compensation of the voltage component: Compensate the voltage component. The two-phase voltage needs to pass through the compensation link I to compensate for this loss. The cut-off frequency of the low-pass filter is set to , the stator electrical angular frequency is set to , the calculation formula of the compensation coefficient is: , to limit the amplitude, that is, to set ;

[0019] Step...

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PUM

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Abstract

The invention discloses a method for observing a rotor magnetic chain based on a cross feedback double compensation method. The method comprises the following steps of: performing 3s/2s conversion on the three-phase voltage and current of a motor obtained by measuring to obtain voltage and current components on a two-phase static coordinate system; compensating the voltage components respectively, and entering a low-pass filtering procedure; multiplying the current components with respective operation coefficients thereof, subtracting a voltage low-pass filtering output value from a product, and multiplying with an operation coefficient in a rotor magnetic chain observing voltage model to obtain an axis basic magnetic chain component; performing point multiplication computation on the magnetic chain component and the voltage component of an axis respectively to obtain an orthogonal coefficient serving as a coefficient used for magnetic chain compensation computation; separating an amplitude from a phase during computation of magnetic chain compensation and only compensating for the amplitude to avoid causing an error on a magnetic chain direction angle; and adding magnetic chain compensation with a basic magnetic chain component to obtain a final output magnetic chain. Due to the adoption of the method, errors of the rotor magnetic chain observing voltage model at a low speed are reduced, response speeds to voltage and current frequency changes are increased, and integral saturation is well suppressed.

Description

technical field [0001] The invention belongs to the field of asynchronous motors and relates to a flux linkage observation method for vector control of three-phase asynchronous motors. Background technique [0002] In the traditional flux-linkage observation voltage model, the DC bias caused by errors in the links of voltage and current signal sampling and A / D conversion will cause saturation after the integral operation, causing the actual value of the observation results to drift. The usual solution is to introduce a high-pass filter link to the flux linkage after the integration link. While achieving the suppression of integral saturation, it also brings amplitude and phase errors, and the result needs to be compensated. The conventional compensation method is only suitable for a certain speed range due to its fixed coefficient, and this coefficient is difficult to determine. With this method, according to the degree of orthogonality between the flux linkage and the back...

Claims

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Application Information

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IPC IPC(8): H02P21/14
Inventor 范波李兴王新勇史光辉
Owner HENAN UNIV OF SCI & TECH
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