三电平SVPWM与SPWM本质联系及对输出电压谐波的分析

LI Hongliang

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三电平SVPWM与SPWM本质联系及对输出电压谐波的分析

更新时间：2025-08-13

- 三电平SVPWM与SPWM本质联系及对输出电压谐波的分析
- Automation of Electric Power Systems Vol. 39, Issue 12, Pages: 130-137(2015)
- 作者机构：
  
  电力传输与功率变换控制教育部重点实验室(上海交通大学),上海市,200240
- 作者简介：
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- Published：2015
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LI Hongliang. [J]. Automation of electric power systems, 2015, 39(12): 130-137.
DOI：

LI Hongliang. [J]. Automation of electric power systems, 2015, 39(12): 130-137. DOI：

摘要

传统三电平空间矢量脉宽调制(SVPWM)算法中含有大量的三角函数并且获取输出电压谐波的方法易受仿真步长、噪声、精度等影响。针对三电平空间电压矢量的分布特点

在120°坐标系下分析三电平变流器的SVPWM与正弦脉宽调制(SPWM)算法的本质联系

由此总结规律:简单的线性计算就可得到SVPWM算法的三相调制波和占空比的计算公式

从而简化了三电平SVPWM算法;针对数字电路的特点

通过傅里叶分析得到输出电压基波和各次谐波幅值的表达式

为滤波器的设计、不同调制算法的比较、进一步的理论分析和计算等提供理论基础。数字信号处理器(DSP)硬件实验证明了所提算法的正确性。

Abstract

The traditional three-level space vector pulse width modulation (SVPWM) algorithm is hard to implement for the numerous trigonometric functions contained. What’s more

the traditional method of acquiring output voltage harmonic of three-level inverter is susceptible to noise

step size and accuracy of simulation. Based on the distribution characteristics of three-level voltage space vector

an analysis is made of the essential relation between three-level inverter SVPWM and sinusoidal pulse width modulation (SPWM) algorithm under the 120° coordinate system. The three-phase modulation wave and pulse duration ratio are obtained just by simple linear calculation

simplifying the three-level SVPWM algorithm. According to the characteristics of digital circuits

the fundamental and harmonic amplitudes of the output voltage are obtained by Fourier analysis

providing a theoretical basis for the filter design

comparison of different modulation algorithms

further theoretical analysis and computation. The results of theoretical analysis are consistent with digital signal processor (DSP) hardware based experimental results. This work is supported by National Basic Research Program of China (973 Program) (No. 2014CB046306).

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