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A Combined Zero-Vector-Free Overmodulation Method for Electric Vehicle Inverters

A technology of electric vehicles and modulation methods, applied in the direction of converting irreversible DC power input into AC power output, electrical components, output power conversion devices, etc., can solve bearing electric corrosion, increase bearing failure rate, and aggravate motor inverter Problems such as system vibration and noise, to achieve the effect of improving NVH quality, reducing vibration and noise, and improving output voltage and peak power capabilities

Active Publication Date: 2021-10-01
SHANGHAI DAJUN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The common-mode voltage output by the electric vehicle motor drive inverter will generate shaft voltage and shaft current on the shaft of the permanent magnet synchronous motor through the coupling capacitor inside the motor, and at the same time generate shaft current, which will galvanically corrode the bearing, increase the wear of the bearing, and make the bearing The failure rate increases and the service life of the bearing is reduced; and it is accompanied by common mode interference, which aggravates the vibration and noise output of the motor inverter system

Method used

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  • A Combined Zero-Vector-Free Overmodulation Method for Electric Vehicle Inverters
  • A Combined Zero-Vector-Free Overmodulation Method for Electric Vehicle Inverters
  • A Combined Zero-Vector-Free Overmodulation Method for Electric Vehicle Inverters

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Embodiment Construction

[0044] The combined zero-vector overmodulation method used in the electric vehicle inverter of the present invention comprises the following steps:

[0045] Step 1, such as figure 1 As shown, set the reference voltage vector V of PWM modulation s Located in the first sector, its synthesis method is obtained according to formula (1),

[0046]

[0047] Among them, T 1 , T 2 , T 3 , T 6 are the voltage vector V 1 , V 2 , V 3 , V 6 The action time, T z is the PWM modulation period;

[0048] Step 2, adopting the composite voltage sequence and the PWM pulse action mode of the zero-vector substitution PWM modulation method to realize the PWM modulation output of the zero-vector substitution PWM modulation;

[0049] The method of voltage vector synthesis according to formula (1) is called zero vector substitution PWM, that is, to select two non-zero opposite voltage vectors adjacent to the sectors where the reference voltage vectors are located (such as the V 3 and V 6...

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Abstract

The present invention disclosed a combination of a combination of electric vehicle inverters. 1 , Mi 2 , Mi 3 , Mi 4 When the modulation ratio range is 0 ≤ mi <mi 1 , Run zero vector replace PWM modulation, when the modulation ratio range MI 1 ≤mi <mi 2 , Run the zero vector to replace the PWM modulation, when the modulation ratio range MI 2 ≤mi <mi 3 , Run the recent non -zero -vector synthetic PWM modulation, when the modulation ratio range MI 3 ≤mi <mi 4 , Run the first non -zero -vector synthetic PWM first modulation area method, when the modulation ratio range MI 4 ≤mi <1, run the recent non -zero -vector synthetic PWM second modulation area method.This method can reduce the peak of the common modulus voltage within the full -modulation ratio, and can effectively increase the output voltage by about 10 %, achieve the ability to suppress the peak of the co -mode voltage, improve the output voltage and peak power of the inverter, reduceThe vibration and noise of the system improve the NVH quality of the vehicle.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a combined zero-vector overmodulation method for an electric vehicle inverter. Background technique [0002] The common-mode voltage output by the electric vehicle motor drive inverter will generate shaft voltage and shaft current on the shaft of the permanent magnet synchronous motor through the coupling capacitor inside the motor, and at the same time generate shaft current, which will galvanically corrode the bearing, increase the wear of the bearing, and make the bearing The failure rate increases and the service life of the bearing is reduced; and it is accompanied by common mode interference, which aggravates the vibration and noise output of the motor inverter system. In order to reduce the peak value of the common-mode voltage and improve the reliability of the motor inverter system, the zero-vector PWM modulation technology is used to suppress the peak value of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48H02M1/12
CPCH02M1/12H02M7/48H02M1/0038H02M1/123
Inventor 吴平仿黄洪剑陈双
Owner SHANGHAI DAJUN TECH