Common-Mode Voltage Suppression Strategy for Three-Level Pulse Width Modulation Inverter

WANG Libo; DU Jinhua

doi:10.7652/xjtuxb202303015

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Common-Mode Voltage Suppression Strategy for Three-Level Pulse Width Modulation Inverter

更新时间：2025-07-09

- Common-Mode Voltage Suppression Strategy for Three-Level Pulse Width Modulation Inverter
- Vol. 57, Issue 3, Pages: 160-172(2023)
- 作者机构：
  
  西安交通大学电气工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202303015
  CLC： TM464
- Online First：10 March 2023，
  
  Published：2023
- 稿件说明：
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WANG Libo, DU Jinhua. Common-Mode Voltage Suppression Strategy for Three-Level Pulse Width Modulation Inverter[J]. 2023, 57(3): 160-172.
DOI：

WANG Libo, DU Jinhua. Common-Mode Voltage Suppression Strategy for Three-Level Pulse Width Modulation Inverter[J]. 2023, 57(3): 160-172. DOI： 10.7652/xjtuxb202303015.

摘要

针对三电平脉宽调制(PWM)逆变器运行过程中会产生大量共模电压、高频dv/dt等谐波的问题

采用一种分区域PWM调制策略(Ma-PWM)来抑制PWM变换器的共模电压。通过调制指数将三电平空间矢量重新划分为多个不同的调制区域

在不同的调制区域内采用4种基本矢量类型中的大矢量、中矢量以及小矢量来实现三电平PWM调制算法。分区域PWM调制策略将扇区内部的小区域划分为高、低两个调制区域

并合理选择最邻近的基本电压矢量来合成参考矢量。仿真结果表明:Ma-PWM调制策略在不同负载类型下的共模电压幅值为直流母线电压的1/6; 此外

在可变速负载下

PWM逆变器的共模电压幅值不仅能够减小到原来的1/2

而且PWM逆变器输出电流波形的总谐波失真小于5%。该方法不仅能够抑制共模电压

还能够减小PWM逆变器输出电流的总谐波失真。

Abstract

In view of the large amount of common mode voltage(CMV)

high-frequency dv/dt and other harmonics generated during the operation of the three-level PWM inverter

a subregion PWM modulation strategy is adopted to suppress the common mode voltage of the PWM converter. The three-level space vector is redivided into several different modulation regions by modulation index. In different modulation regions

the three-level PWM modulation algorithm is realized by using large vector

medium vector

and small vector of four basic vector types. The subregion PWM modulation strategy(Ma-PWM)divides the small region inside the sector into high and low modulation regions

and uses the nearest basic voltage vector to synthesize the reference vector. The simulation results show that the common mode voltage amplitude of the proposed Ma-PWM modulation strategy under different load types is 1/6 of the DC bus voltage. In addition

the common mode voltage amplitude of the PWM inverter under variable speed load can be reduced to 1/2 of the original

and the total harmonic distortion(THD)of the output current waveform of the PWM inverter is less than 5%. This method can not only suppress the common mode voltage but also reduce the total harmonic distortion of the PWM inverter output current.

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references

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