Control strategy of DC voltage balance and power equilibrium for grid-connected cascaded H-bridge converters

被引：1

作者：

Sun, Yichao ^{[1
]}

Zhao, Jianfeng ^{[1
]}

Ji, Zhendong ^{[1
]}

机构：

[1] College of Electrical Engineering, Southeast University

来源：

Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2014年 / 34卷 / 01期

关键词：

Cascaded H-bridge; DC voltage balance; Electric converters; Modulation wave reconstruction; Multilevel technology; Power equilibrium; Voltage control;

D O I：

10.3969/j.issn.1006-6047.2014.01.010

中图分类号：

学科分类号：

摘要：

The mathematical model of cascaded H-bridge converters is established and the causes of unbalanced DC voltage between H-bridges and inequilibrium power transfer are discussed in detail. A control scheme is proposed based on the vector reconstruction of modulation wave, which, by introducing the modulation wave error component to traditional double closed loop control and DC voltage balance control, reconstructs the initial modulation wave to distribute the active power as required and the reactive power equally among H-bridges for ensuring the DC voltage balance. The restraint area of the proposed control scheme based on linear modulation theory is wider than that based on direct modulation ratio adjustment, suitable for larger load unbalance. Its correctness and effectiveness are tested and verified by simulation with MATLAB/Simulink.

引用

页码：55 / 60

页数：5

共 19 条

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