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Single-current speed sensorless vector control method based on rotation speed adaptive rate compensation method

A speed sensorless, self-adaptive rate technology, applied in the direction of vector control system, motor control, motor generator control, etc., can solve the problems of unbalanced three-phase current, excessive drop of speed, etc., to improve reliability, reduce quantity, Good control of the effect of stiffness

Active Publication Date: 2017-05-31
山东汉德自动化控制设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problems of unbalanced three-phase current and excessive drop of rotational speed during loading in the prior art, and proposes a single-current speed-sensorless vector control method based on rotational speed adaptive rate compensation method

Method used

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  • Single-current speed sensorless vector control method based on rotation speed adaptive rate compensation method
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  • Single-current speed sensorless vector control method based on rotation speed adaptive rate compensation method

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specific Embodiment approach 1

[0026] Embodiment 1: A single current speed sensorless vector control method based on the speed adaptive rate compensation method includes the following steps:

[0027] The invention uses the observed current of the full-order observer plus the compensation value based on the adaptive rate of the rotational speed to replace the sampling value of the current sensor, and the rotational speed is also estimated by the full-order observer, thereby maintaining the stability of the system.

[0028] Step 1: In the two-phase static reference coordinate system, select the stator and rotor flux linkage of the asynchronous motor as the state variables to obtain the state equation of the asynchronous motor; the two-phase static reference coordinate system is obtained by the three-phase static ABC coordinate system through CLARK transformation The A-axis, B-axis and C-axis of the three-phase stationary ABC coordinate system correspond to the three-phase symmetrical stationary windings of the...

specific Embodiment approach 2

[0034] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in the step 1, under the two-phase stationary reference coordinate system, the stator and rotor flux linkage of the asynchronous motor is selected as the state variable, and the state equation of the asynchronous motor is specifically obtained as :

[0035]

[0036]

[0037] In the formula ψ s =[ψsα ψ sβ ] T ,ψ r =[ψ rα ψ rβ ] T ,u s =[u sα u sβ ] T ,i s =[i sα i sβ ] T , are stator flux linkage, rotor flux linkage, stator voltage and stator current vector respectively; ψ sα and ψ sβ are the components of the stator flux linkage on the α-axis and β-axis respectively, ψ rα and ψ rβ are the components of the rotor flux linkage on the α-axis and β-axis respectively, u sα and u sβ are the components of the stator voltage on the α-axis and β-axis respectively, i sα and i sβ are the components of the stator current on the α-axis and β-axis respectivel...

specific Embodiment approach 3

[0040] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in the step 2, according to the state equation of the asynchronous motor obtained in the step 1, the specific process of obtaining the full-order state observer is as follows:

[0041] The specific process is:

[0042] According to equations (1) and (2), the full-order state observer is obtained:

[0043]

[0044]

[0045] in:

[0046] is the observer state matrix, which is the electrical angular velocity The function of (setting the electrical angular velocity of the rotor The initial value of is 0, and the electrical angular velocity of the rotor after each update obtained in step five Substitute into the state matrix of the surrogate observer in step 2 middle ); the superscript "^" indicates the observed value; H is the error feedback matrix; assuming Motor parameters and rotor speed in matrix is slowly changing, that is, within each cycle The matrix is ​​unch...

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Abstract

The invention relates to a single-current speed sensorless vector control method based on the rotation speed adaptive rate compensation method. The single-current speed sensorless vector control method includes the steps that firstly, under a two-phase stationary reference coordinate system, asynchronous motor stator and rotor flux linkages serve as state variables to obtain an asynchronous motor state equation; secondly, the initial value of the electric angle speed of a rotor is set to be 0, and a full-order state observer is obtained; thirdly, according to the obtained full-order state observer, a beta-axis stator current observation value is obtained; fourthly, according to the obtained beta-axis stator current observation value, a compensated beta-axis stator current isbeta is obtained; fifthly, the updated electric angle speed of the rotor is obtained, whether the updated electric angle speed meets conditions or not is judged, if yes, the process is finished, and if not, the updated electric angle speed is substituted into the second step till the updated electric angle speed meets the condition. The method is applied to the fields of cranes and aerospace.

Description

technical field [0001] The invention relates to a single current speed sensorless vector control method based on a speed adaptive rate compensation method. Background technique [0002] Due to the influence of the external environment, humidity, corrosion, high and low temperature, and dust may cause the inverter to malfunction and cause the frequency conversion speed regulation system to collapse. The common problem is that the feedback information cannot be obtained due to the failure of the sensor, so that the system cannot form a closed loop. The current sensor and the speed sensor are the links that are prone to failure. Many protections are set inside the control system, such as overcurrent, DC bus overvoltage, and overheating, etc. Generally, shutdown is used as a protection measure, but in some applications, such as elevator drives, aircraft electric drive systems, and mines The electric brake and the hook driver of the crane, etc., are not allowed to stop when they...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/28
CPCH02P2205/01
Inventor 于泳赵永正黄晓雷徐殿国
Owner 山东汉德自动化控制设备有限公司