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PWM modulation method for electric vehicle motor inverter

A modulation method and electric vehicle technology, applied in the direction of AC motor control, irreversible DC power input conversion to AC power output, control system, etc., to suppress the motor shaft current amplitude, reduce vibration and noise output, and improve driving quality effect

Active Publication Date: 2021-06-01
SHANGHAI DAJUN TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a PWM modulation method for electric vehicle motor inverters. This method overcomes the defects of traditional motor inverter modulation, effectively reduces the common-mode voltage output amplitude at the time of zero vector, and suppresses The current amplitude of the motor shaft increases the service life of the motor bearing, reduces the vibration and noise output of the motor inverter system, and improves the driving quality of the vehicle

Method used

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  • PWM modulation method for electric vehicle motor inverter
  • PWM modulation method for electric vehicle motor inverter
  • PWM modulation method for electric vehicle motor inverter

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Embodiment Construction

[0067] The PWM modulation method that the present invention is used for electric vehicle motor inverter comprises the following steps:

[0068] Step 1. Set the modulation ratio of the inverter as:

[0069] MI=V s / (0.6366U DC ) (1)

[0070] Among them, V s is the motor stator reference voltage vector, U DC is the DC bus voltage;

[0071]The inverter is PWM modulated by the non-zero-vector PWM modulation method, and the reference voltage vector synthesis selects two adjacent non-zero vector V 1 , V 2 and two non-zero opposite vectors V 3 , V 6 , and make its two non-zero opposite vectors V 3 and V 6 respectively act for the same time to be equivalent to the effect of the zero vector, for example, as figure 2 As shown, the reference voltage vector V s In the first sector, using the non-zero voltage vector V 1 , V 2 Used to synthesize the reference voltage vector V s , vector V 3 and V 6 Respectively act the same time to replace the zero vector;

[0072] Using ...

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Abstract

The invention discloses a PWM modulation method for an electric vehicle motor inverter. The method uses the NZPWM modulation method to perform PWM modulation on the inverter, and reasonably arranges the reference voltage vector synthesis sequence and PWM pulse action mode of each sector ; Correct the three-phase modulation wave generated by NZPWM modulation to obtain the inverter boundary modulation ratio parameters, and perform NZPWM modulation and SVPWM modulation respectively according to the modulation ratio parameters; when the voltage vector enters the over-modulation region from the linear modulation region, use The discrete PWM modulation method over-modulates the inverter and divides it into two areas, and sets the modulation ratio of the lower boundary of the two areas; according to the modulation ratio, the discrete PWM modulation of the two over-modulation areas is respectively performed to obtain the desired PWM waveform. The method effectively reduces the common-mode voltage output amplitude at the time of zero vector, suppresses the motor shaft current amplitude, improves the service life of the motor bearing, reduces the vibration and noise output of the motor inverter system, and improves the driving quality of the vehicle.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a PWM modulation method for an electric vehicle motor inverter. Background technique [0002] Usually in the modulation of the embedded three-phase permanent magnet synchronous motor (PMSM) driving the inverter of the electric vehicle, the pulse width modulation (PWM) strategy is used to realize the control of the motor stator voltage space vector. figure 1 The structure diagram of the three-phase inverter is shown, and the PWM methods for modulating it include sinusoidal pulse width modulation (SPWM), space voltage vector pulse width modulation (SVPWM), and discrete PWM modulation. If the inverter modulation ratio is defined as: [0003] MI=V s / (0.6366U DC ) (1) [0004] Among them, V s is the motor stator reference voltage vector, U DC is the DC bus voltage. [0005] The modulation wave of SPWM is a three-phase sinusoidal signal, and its maximum linear modulation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/08H02P27/12H02M7/42H02M7/5387
CPCH02M7/42H02M7/53875H02P27/085H02P27/12H02M7/53876
Inventor 吴平仿陈双黄洪剑
Owner SHANGHAI DAJUN TECH
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