Analysis of the Phase-Shifted Carrier Modulation for Modular Multilevel Converters
Analysis of the Phase-Shifted Carrier Modulation for Modular Multilevel Converters
复制标题
模块化多电平变换器的相移载波调制分析
DOI：
10.1109/tpel.2014.2299802
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发表时间：
2015-01-01
影响因子：
6.7
通讯作者：
Xu, Dianguo
中科院分区：
文献类型：
--
作者：
Li, Binbin;Yang, Rongfeng;Xu, Dianguo
模块化多电平变换器（MMC）是一种新兴的大功率拓扑结构，被认为是高压电力变换器的发展趋势。本文首先介绍了采用电容电压平衡法的MMC移相载波调制的一般实现方法。然后，对MMC的PSC调制进行了数学分析，以识别输出电压和环流的PWM谐波特性。此外，还研究了上下臂之间的载体位移角对这些谐波的影响。利用这种分析，最佳的位移角指定的输出电压谐波最小化和循环电流谐波消除，分别。线间电压和直流母线电流的谐波特征也进行了研究。此外，还提出了一种扩展的PSC调制MMC与全桥子模块，可以增加两倍的输出电压和环流的等效开关频率相比，传统的MMC。最后，在MMC原型上进行了实验验证。
The modular multilevel converter (MMC) is an emerging topology for high-power applications and is considered as the development trend of the high-voltage power converters. In this paper, general implementation of the phase-shifted carrier (PSC) modulation with a capacitor voltage balancing method for MMC is first introduced. Then, the mathematical analysis of PSC modulation for MMC is performed to identify the PWM harmonic characteristics of the output voltage and the circulating current. Moreover, influence of the carrier displacement angle between the upper and lower arms on these harmonics is also studied. Using this analysis, the optimum displacement angles are specified for the output voltage harmonics minimization and the circulating current harmonics cancellation, respectively. The harmonic features of the line-to-line voltage and the dc-link current are also investigated. Moreover, an extension of the PSC modulation for MMC with full-bridge submodules is also proposed which can increase the equivalent switching frequency of the output voltage and circulating current by two times compared with the conventional MMC. Finally, the findings are verified experimentally on a prototype of MMC.