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首页> 外文会议>2000 International Conference on Power System Technology >MULTI-MODULAR MULTI-LEVEL PULSE WIDTH MODULATED INVERTERS
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MULTI-MODULAR MULTI-LEVEL PULSE WIDTH MODULATED INVERTERS

机译：多模多级脉宽调制逆变器

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This paper presents the analysis and simulation of single phase Multi-level and Multi-modular PWM inverters and three phase Multi-level inverters using the software called Power System Computer Aided Design (PSCAD). Multi-level voltage source inverters offer several advantages compared to their conventional ones. This technology is based on the synthesis of the AC voltage from several different voltage levels on the DC bus. As the number of voltage levels on the DC side increase, the synthesised output adds more steps, producing staircase wave which approaches the sinusoidal wave with the minimum harmonic distortion. To achieve this, one of the switching techniques called Pulse-Width Modulation (PWM) is applied. In this technique, the comparison of carrier frequency and fundamental frequency is performed to produce modulated frequency. As the carrier frequency increases, the width of the modulated signal become narrower and hence it leads to a smoother output waveforms. The effect on Total Harmonic Distortion (THD) is investigated on both proposed Multi-level and Multi-Module designs.
机译：本文介绍了使用称为Power System Computer Aided Design（PSCAD）的软件对单相多电平和多模块PWM逆变器以及三相多电平逆变器进行的分析和仿真。与传统电压源逆变器相比，多电平电压源逆变器具有多个优势。该技术基于直流母线上几种不同电压电平的交流电压合成。随着直流侧电压电平数量的增加，合成的输出将增加更多的阶跃，从而产生阶梯波，该阶梯波以最小的谐波失真接近正弦波。为此，应用了一种称为脉冲宽度调制（PWM）的开关技术。在该技术中，执行载波频率与基频的比较以产生调制频率。随着载波频率的增加，调制信号的宽度变窄，因此导致输出波形更平滑。在提出的多级和多模块设计中都研究了对总谐波失真（THD）的影响。

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