Characteristic analysis of carrier phase-shifted SPWM output voltage of cascaded h-bridge converters

被引：0
|
作者：
Wu L. [1 ]
Tu C. [1 ]
Jiang F. [1 ]
Guo Q. [1 ]
Liu Z. [1 ]
机构：
[1] National Electric Power Conversion Control Engineering Technology Research Center(Hunan University), Changsha, 410082, Hunan Province
来源：
Dianwang Jishu/Power System Technology | 2016年 / 40卷 / 07期
基金：
中国国家自然科学基金;
关键词：
Carrier phase shift; Dynamic voltage restorer; High voltage cascade; Modulation ratio; Multi-level;
D O I：
10.13335/j.1000-3673.pst.2016.07.033
中图分类号：
学科分类号：
摘要：
Cascaded H-bridge inverter can obviously improve equivalent working frequency and decrease harmonic distortion of compensation voltage. Close relationship exists between modulation ratio and output performance of inverter. Through theoretical analysis, relationships between output level number and modulation ratios for bipolar and unipolar CPS-SPWM (carrier phase-shifted SPWM) modulations are derived respectively. Positive-negative offset level principle is illustrated when bipolar CPS-SPWM is adopted. In addition, when bipolar or unipolar CPS-SPWM modulation is adopted, a dc-side voltage selection method based on expectation numbers of output level is presented under specific compensation degree. PSCAD/EMTDC simulation results confirm correctness of the analysis of modulation ratio and output levels and effectiveness of dc side voltage selection method. © 2016, Power System Technology Press. All right reserved.
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收藏
页码：2155 / 2161
页数：6
相关论文
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