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Current space vector error projection correction-based fault-tolerant method for current sensor of position sensorless driving system

A technology of current space vector and current sensor, applied in vector control system, motor generator control, control system, etc., can solve the problems of poor reliability and permanent magnet synchronous motor not running normally, and achieve improved accuracy and good steady-state performance , Reduce the effect of speed fluctuation

Active Publication Date: 2019-07-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the problem that in the existing vector control technology of permanent magnet synchronous motors, sensors are required to collect signals to ensure the reliable driving of permanent magnet synchronous motors. sex problem

Method used

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  • Current space vector error projection correction-based fault-tolerant method for current sensor of position sensorless driving system
  • Current space vector error projection correction-based fault-tolerant method for current sensor of position sensorless driving system
  • Current space vector error projection correction-based fault-tolerant method for current sensor of position sensorless driving system

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specific Embodiment approach 1

[0023] Specific implementation mode one: refer to figure 1 and Figure 4 Specifically explain this embodiment, a current sensor fault-tolerant method for a position sensorless drive system based on current space vector error projection correction described in this embodiment, the method includes the following steps:

[0024] Step 1, using a full-order position observer to obtain the estimated rotational speed and estimated position information of the permanent magnet synchronous motor, and inputting the estimated rotational speed and estimated position information into the regulator of the permanent magnet synchronous motor vector control system for vector control;

[0025] Step 2. When a failure of a certain phase current sensor is detected, a current error reconstruction link is used to obtain a current space vector error based on the measured phase current error, and the current space vector error is projected to obtain a reconstructed phase current error;

[0026] Step 3....

specific Embodiment approach 2

[0035] Specific embodiment 2: This embodiment is a further description of a current sensor fault-tolerant method for a position sensorless drive system based on current space vector error projection correction described in specific embodiment 1. In this embodiment, in step 1, The specific process of using the full-order position observer to obtain the speed and position information of the permanent magnet synchronous motor is as follows:

[0036] When the motor is running in the middle and high speed range, select the state variable X=[i α i β e α e β ] T , output variable y=[i α i β ] T and input quantity u=[u α u β 0 0] T The state equation for constructing a full-order position observer is:

[0037]

[0038] In the formula, e α is the extended back electromotive force of the α axis, e β is the extended back EMF of the β axis, i α is the α-axis current, i β is the β-axis current, To estimate the α-axis current, To estimate the β-axis current, u α...

specific Embodiment approach 3

[0040] Specific implementation mode three: refer to figure 2 and image 3 Describe this embodiment in detail. This embodiment is a further description of a current sensor fault-tolerant method for a position sensorless drive system based on current space vector error projection correction described in Embodiment 2. In this embodiment, step 2 , the current error reconstruction link obtains the current space vector error according to the measured phase current error and the specific process is as follows:

[0041] α-axis current i α By heterodyning:

[0042]

[0043] In the formula, is the α-axis current error, To reconstruct the β-axis current error, is the current space vector error, is the estimated value of the current space vector error, γ is the current space angle, To estimate the position information, δ is obtained from Equation 3:

[0044]

[0045] In the formula, For a given d-axis current, For a given q-axis current,

[0046] The formula obt...

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Abstract

The invention discloses a current space vector error projection correction-based fault-tolerant method for a current sensor of a position sensorless driving system, and relates to the field of motor control, and aims to solve the problem that in an existing vector control technology of a permanent magnet synchronous motor, a sensor is required to collect a signal to guarantee reliable driving of the permanent magnet synchronous motor, but once the sensor breaks down, the permanent magnet synchronous motor cannot normally run, so that the reliability is poor. An estimated speed and estimated position information of the permanent magnet synchronous motor are obtained; when a certain phase current sensor breaks down, a current error reconstruction link is used for obtaining a current space vector error according to a phase current error, and projecting the error to obtain a reconstructed phase current error; according to the reconstructed phase current error, the phase current error, theestimated speed, an alpha-axis voltage and a beta-axis voltage, an estimated alpha-axis current value and an estimated beta-axis current value are obtained; and performing closed-loop control on the permanent magnet synchronous motor by using values obtained after conversion of the estimated values. The method is used for correcting a phase current to control the motor.

Description

technical field [0001] The invention relates to a current sensor fault-tolerant method for a position sensor-less drive system based on current space vector error projection for correction. It belongs to the field of motor control. Background technique [0002] With great breakthroughs in the manufacturing technology of power switching devices in recent years, the capacity and frequency have been improved. At the same time, the research on the speed regulation strategy of AC motors has been continuously improved, and the AC speed regulation system has gradually become the mainstream in the field of electric drives. Compared with traditional electrically excited motors, permanent magnet synchronous motors do not require rotor windings, and have the advantages of high power density, high moment-to-inertia ratio, high power factor and good speed regulation performance, and are more suitable for the needs of the industrial field. [0003] The vector control technology of perma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/24
CPCH02P2207/05H02P21/24
Inventor 王高林周洪雷张国强李成睿王奇维赵楠楠徐殿国
Owner HARBIN INST OF TECH
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