【电力电子】【2012.05】三种脉宽调制（PWM）技术的MATLAB/SIMULINK仿真实现与分析...

本文为美国博伊西州立大学（作者：Phuong Hue Tran）的硕士论文，共102页。

 

随着固态电力电子器件和微处理器的发展，各种脉宽调制（PWM）技术已被开发用于工业应用。例如，基于脉宽调制（PWM）的三相电压源逆变器（VSI）将直流电源转换为具有可变电压幅度和可变频率的交流电源。

 

本文讨论了三种不同的脉宽调制技术：正弦脉宽调制（SPWM）、三次谐波注入脉宽调制（THIPWM）和空间矢量脉宽调制（SVPWM）的优缺点。通过讨论这三种方法的实现难易度，分析各种输出电压（极电压、线对中性点电压和线对线电压）及其总谐波失真（THD）的输出谐波频谱，对这三种方法进行了比较。仿真结果表明，与SPWM技术相比，THIPWM和SVPWM技术具有较低的总谐波失真。欠调制区的THIPWM和SVPWM技术均能使基波输出电压比SPWM技术提高15.5%。此外，在过调制区域1和2中，SVPWM技术可以分别增加5%左右的基波输出。

 

With advances in solid-state power electronic devices and microprocessors, various pulse-width-modulation (PWM) techniques have been developed for industrial applications. For example, PWM-based three-phase voltage source inverters (VSI) convert DC power to AC power with variable voltage magnitude and variable frequency. This thesis discusses the advantages and drawbacks of three different PWM techniques: the sinusoidal PWM (SPWM) technique, the third-harmonic-injection PWM (THIPWM) technique, and the space-vector PWM (SVPWM) technique. These three methods are compared by discussing their ease of implementation and by analyzing the output harmonic spectra of various output voltages (poles voltages, line-to-neutral voltages, and line-to-line voltages) and their total harmonic distortion (THD). The simulation results show that both the THIPWM and SVPWM techniques have lower total harmonic distortion than the SPWM technique. The THIPWM and SVPWM techniques in the under-modulation region can both increase the fundamental output voltage by 15.5% over the SPWM technique. Moreover, the SVPWM technique can increase the fundamental output by about 5% in each of the overmodulation regions 1 and 2, respectively.

 

1 引言

2 正弦PWM与三次谐波注入PWM

3 空间向量PWM

4 过调制区间的空间向量PWM

5 仿真结果

6 比较SPWM、THIPWM和SVPWM技术

7 结论与未来研究工作展望 

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