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首页> 外文期刊>Energy Conversion & Management >Direct AC-AC grid interface converter for ocean wave energy system
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Direct AC-AC grid interface converter for ocean wave energy system

机译：用于海浪能源系统的直接AC-AC电网接口转换器

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摘要

Ocean wave energy is very promising. However, existing systems are using rectifying circuits to convert variable voltage and variable frequency output of electric generator into DC voltage and then use grid-tied inverter to connect to the power grid. Such arrangement will not only reduce the overall efficient but also increase the cost of the system. A direct AC-AC converter is a desirable solution. In this paper, a six-switch AC-AC converter has been proposed as a single phase grid-connected interface. New switching scheme has been derived for the converter such that the virtual input AC-DC conversion and the output DC-AC conversion can be decoupled. State-space averaging model and pulse width modulation scheme have been derived for the converter. As the input and the output operations can be decoupled, two independent controllers have been designed to handle the input AC-DC regulation and the output DC-AC regulation. The proposed scheme demands for two separate duty ratios and novel switching scheme has been derived to realize the combined duty ratios in one switching cycle. Power regulation, harmonics elimination and power factor correction control algorithms have also been derived for the converter when it is connected to the supply grid. Experimental results of a small scale model are included to demonstrate the effectiveness of the proposed switching and control schemes.
机译：海浪能量非常有前途。然而，现有的系统正在使用整流电路将发电机的可变电压和可变频率输出转换为DC电压，然后使用并网逆变器连接至电网。这种布置不仅会降低整体效率，而且会增加系统成本。直接AC-AC转换器是理想的解决方案。在本文中，提出了一种六开关AC-AC转换器作为单相并网接口。已经为转换器导出了新的开关方案，从而可以将虚拟输入AC-DC转换和输出DC-AC转换解耦。已经为转换器推导了状态空间平均模型和脉冲宽度调制方案。由于可以将输入和输出操作解耦，因此设计了两个独立的控制器来处理输入AC-DC调节和输出DC-AC调节。提出的方案要求有两个单独的占空比，并推导了新颖的开关方案以在一个开关周期内实现组合的占空比。当转换器连接到电网时，还可以导出功率调节，谐波消除和功率因数校正控制算法。包括一个小规模模型的实验结果，以证明所提出的切换和控制方案的有效性。

著录项

  • 来源
    《Energy Conversion & Management》 |2015年第3期|302-311|共10页
  • 作者

    K.M. Tsang; W.L. Chan;

  • 作者单位

    Department of Electrical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;

    Department of Electrical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Ocean wave energy; Grid-connected converter; Power conditioning;

    机译：海浪能量;并网转换器功率调节;

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