Modular multilevel matrix converter for low frequency AC transmission
Modular multilevel matrix converter for low frequency AC transmission
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DOI：
10.1109/peds.2013.6527180
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发表时间：
2013-04
期刊：
影响因子：
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通讯作者：
Y. Miura;T. Mizutani;M. Ito;T. Ise
中科院分区：
文献类型：
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作者：
Y. Miura;T. Mizutani;M. Ito;T. Ise
研究了模块化多电平矩阵变换器在低频交流输电系统中的应用。LFAC（1 Hz ~ 20 Hz）与传统的交流和直流输电系统相比具有一些优点，例如由于电容充电电流的减少而增加了电力电缆的载流能力，并且由于存在断路所需的零电流点而具有更好的故障保护。对于LFAC传输系统的变频器，由多个H桥单元作为双向开关组成的MMMxC是非常有前途的，因为通过串联H桥单元可以容易地实现低频、高压和大功率转换;通过多级配置改善波形失真;并且即使在非常低的频率操作下也可以保证电流换向。在本文中，提出了一种新的方案的MMMxC的功率和电容电压控制，特别是在低频操作下，其特性进行了研究。此外，实验进行验证所提出的控制方案，使用1千瓦级的实验室设置。
The modular multilevel matrix converter (MMMxC) applied to a low frequency ac (LFAC) transmission system is investigated. The LFAC (1 Hz ~ 20 Hz) has some advantages compared to conventional ac and dc transmission systems, such as the increase of current-carrying capacity of power cables due to reduction of capacitive charging current, and better fault protection due to existence of zero current points required for circuit breaking, respectively. For the frequency converter of the LFAC transmission system, the MMMxC that consists of a number of H-bridge cells as bidirectional switches is very promising because low frequency, high voltage and high power conversion are easily realized by connecting H-bridge cells in series; waveform distortion is improved by multilevel configuration; and current commutation is guaranteed even in very low frequency operation. In this paper, a new scheme of power and capacitor voltage control for the MMMxC is proposed and its characteristics are investigated especially under low frequency operation. In addition, experiments are carried out to verify the proposed control schemes using a 1 kW class laboratory setup.