中压大容量 FC-MMC 型变频器的低频运行控制方法

IF 3.2 Q2 AUTOMATION & CONTROL SYSTEMS
Weiman Yang, Bo Yang, Xin Liu, Xinggui Wang, Qun Guo
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引用次数: 0

摘要

模块化多电平转换器(MMC)在大型驱动系统中的应用受到严重的低频运行限制。子模块中电容器电压的波动和共模电压的高幅值是一个棘手的问题。本文采用了一种新颖的飞越电容器模块化多电平转换器拓扑结构,利用飞越电容器作为多电平转换器上下桥臂之间的功率传输通道,消除低频电压纹波。该方法引入了一个实时可变的限制因子,以改变混合注入的高频差模电压和高频差模电流的幅值,并降低交流侧共模电压的幅值,同时降低功率器件的电流应力。最后,构建了完整的系统仿真模型,并验证了拓扑结构与所提出的控制策略在不同运行条件下均具有良好的输出特性,在抑制子模块波动和共模电压方面取得了良好的效果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Low-frequency operation control method for medium-voltage high-capacity FC-MMC type frequency converter
The application of modular multilevel converters (MMCs) to large drive systems is subject to severe low-frequency operation restrictions. The fluctuation of capacitor voltage and the high amplitude of common mode voltage in sub-modules is a thorny problem. In this paper, a novel fly-across capacitor modular multilevel converter topology is adopted to eliminate low-frequency voltage ripples by using the fly-across capacitor as a power transfer channel between the upper and lower bridge arms of the MMC. A novel finite compensation method is proposed—instead of the traditional full compensation method—that introduces a real-time variable limiting factor to change the amplitude of the mixed injected high-frequency differential-mode voltage and high-frequency differential-mode current and reduce the amplitude of the common-mode voltage on the AC side while lowering the current stress of the power devices. Finally, a complete system simulation model is constructed, and the topology with the proposed control strategy are verified to have good output characteristics under different operating conditions; good results are achieved in suppressing the sub-module fluctuation and common-mode voltage.
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来源期刊
Systems Science & Control Engineering
Systems Science & Control Engineering AUTOMATION & CONTROL SYSTEMS-
CiteScore
9.50
自引率
2.40%
发文量
70
审稿时长
29 weeks
期刊介绍: Systems Science & Control Engineering is a world-leading fully open access journal covering all areas of theoretical and applied systems science and control engineering. The journal encourages the submission of original articles, reviews and short communications in areas including, but not limited to: · artificial intelligence · complex systems · complex networks · control theory · control applications · cybernetics · dynamical systems theory · operations research · systems biology · systems dynamics · systems ecology · systems engineering · systems psychology · systems theory
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