本文为美国密苏里科技大学（作者：PATERRSON THOMAS）的硕士论文，共50页。

本文以三种电力电子式逆变器为研究对象，从输出电压和输出电流的总谐波失真角度分析了它们的性能。首先，对单H桥逆变器进行了仿真。采用阶梯开关技术产生开关的门控脉冲。每半个周期只有一个开关切换。所需输出电压的基波分量为120V。其次，基于相同的拓扑结构采用双极性PWM门控技术。载波的开关频率为33×60赫兹。第三，设计了一种多电平H桥逆变器，将两个H桥单元串联在一起，一个H桥单元与直流源（主H桥逆变器）相连，另一个H桥单元与电容器（辅助逆变器）相连。提出了用电容器调压的方法来控制电容器电压。最后，对三种情况下输出电流和输出电压的总谐波失真进行了FFT分析。在负载电感值不变的情况下，对三种逆变器输出电流的总谐波失真进行了比较研究。在比较逆变器时，还考虑了成本、尺寸、所用元件数量和设计水平因素。

In this thesis, three cases of power electronic inverters are taken into consideration to analyze their performance in terms of total harmonic distortion in their output voltage and output current. Firstly, a single H-bridge inverter is simulated. Staircase switching technique is used to generate the gating pulses for the switches. Only one switch is made to toggle for every half cycle. The fundamental harmonic component of the desired output voltage is considered to be 120 V. Secondly, the same topology is used with a Bipolar PWM gating technique. The switching frequency of the carrier wave is 33*60 Hz. Thirdly, a multilevel H-bridge inverter is designed by connecting two H-bridge cells in series - one H-bridge cell with a DC source (main H-bridge inverter) and other with a capacitor (auxiliary inverter). The capacitor voltage regulation method is also proposed to control the voltage of the capacitor. Finally, FFT analysis is performed to understand the total harmonic distortion of output current and output voltage of all the three cases. A comparison study is made between all the three inverters’ total harmonic distortion of their output current by keeping the load inductor value as constant and vice versa. Cost, size, no. of components used and design level factors are also taken into consideration to compare the inverters.

1.       引言

2. 单H桥逆变器

3. 双极性PWM逆变器

4. 混合多电平H桥逆变器

5. 三种逆变器的比较

6. 结论

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