A New Estimation Method for Rotor Flux Linkage of Asynchronous Motor

A rotor flux linkage and asynchronous motor technology, applied in the control of generators, motor generator control, electronic commutation motor control, etc., can solve the rotor flux estimation deviation, the large difference in the characteristics of the integral link, and the flux observation of the voltage model The device cannot be used in low-frequency bands, etc., to achieve the effect of eliminating the impact

Active Publication Date: 2022-04-19
长沙市日业电气有限公司
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  • Application Information

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Problems solved by technology

However, due to the existence of an integral link in the rotor flux observer of the voltage model, the integral will be affected by the initial value of the integral in the time domain, which will lead to serious deviations in the estimation of the rotor flux
[0014] Since the integral link is greatly affected by the initial value of the integral, the rotor flux observer based on the voltage model generally uses a first-order inertial link to replace the integral link, but the characteristics of the first-order inertial link at low frequencies are very different from those of the integral link. , so the conventional voltage model flux observer cannot be used in the low frequency band

Method used

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  • A New Estimation Method for Rotor Flux Linkage of Asynchronous Motor
  • A New Estimation Method for Rotor Flux Linkage of Asynchronous Motor
  • A New Estimation Method for Rotor Flux Linkage of Asynchronous Motor

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Effect test

Embodiment 1

[0037] Example 1: See Figure 1-3 , a new rotor flux linkage estimation method for asynchronous motors, including the following steps:

[0038] Step 1. Based on the voltage model, use the adaptive notch filter to estimate the rotor flux linkage of the asynchronous motor, obtain the position of the rotor, and perform the FOC control of the asynchronous motor. The transfer function of the adaptive notch filter is as shown in formula (5) Show:

[0039]

[0040] where ω is the notch frequency, ω c Is the notch filter bandwidth, assuming that the selected frequency is 50Hz, take ω=100π, ω c =1π, the Bode diagram of the notch filter is as follows figure 1 As shown, the amplitude does not attenuate at 50Hz, and the phase lags by 90°, so it can be used to simulate the frequency domain characteristics of the integral.

[0041] Step 2. According to the following formula (3) and formula (4), use the phase-locked loop PLL to obtain the frequency ω of the stator voltage of the async...

Embodiment 2

[0047] Embodiment 2, on the basis of Embodiment 1, in order to realize the substitution of integral, adopt phase-locked loop (PLL) to obtain the frequency ω of stator voltage of asynchronous motor, then combine ω with the appropriate notch filter bandwidth ω c Assign formula (5).

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Abstract

The invention discloses a new method for estimating the rotor flux linkage of an asynchronous motor, which belongs to the technical field of motor control. Based on a voltage model, an adaptive notch filter is used to estimate the rotor flux linkage of an asynchronous motor, and the position of the rotor is obtained to perform asynchronous Motor FOC control, the present invention uses an adaptive notch filter to replace the integral link in the rotor flux observer of the voltage model, which is equivalent to converting the integral from the time domain to the frequency domain, eliminating the influence of the initial value of the integral on the estimation of the rotor flux linkage , so that the flux observer based on the voltage model can be applied to the whole frequency range.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a new method for estimating the rotor flux linkage of an asynchronous motor. Background technique [0002] When the asynchronous motor is performing field-oriented control (FOC), the rotor flux linkage is often used to decouple the active and reactive power of the rotor to achieve high-performance control. [0003] The rotor flux linkage orientation must first obtain the rotor flux linkage of the asynchronous motor. There are two commonly used rotor flux observers for asynchronous motors, one is the rotor flux observer based on the current model, and the other is the rotor flux observer based on the voltage model. chain observer. [0004] In the rotor flux observer of the current model, formula (1) is the rotor flux Amplitude calculation, formula (2) is the rotor flux linkage The position calculation is shown as: [0005] [0006] [0007] where i st is the T-a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14H02P21/13H02P21/18
CPCH02P21/14H02P21/13H02P21/18
Inventor 黄自翔曾智波陈自强
Owner 长沙市日业电气有限公司
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