级联储能变换器直流链纹波电流的抑制策略

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摘要储能系统既能作为电源,又可以作为负荷,在微网中起着双向调节的重要作用。随着微网中储能技术的应用,级联多电平变换器作为一种新颖的储能功率调节系统（PCS）开始被广泛研究。级联储能变换器的H桥直流链电流包括直流分量与纹波电流分量,纹波电流分量会对电池储能系统性能产生不利影响。论文首先研究了H桥直流链电流中纹波电流形成的机理,建立了H桥纹波电流电路模型,研究了直流链纹波电流的传输特性与影响因素；在此基础上提出了基于直流有源滤波器（DC-APF）的级联储能变换器电路拓扑,研究了利用直流有源滤波器抑制H桥直流链纹波电流的控制策略,最后通过仿真显示了该方法的有效性。

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	丁明
	陈中
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关键词 ：微网, 储能多电平级联变换器, 直流链纹波电流, 直流有源滤波器

Abstract：The energy storage system can not only be used as power source but also the load, so it plays a vital role of bidirectional adjustment in microgrid. With the application of energy storage technology in microgrid, the multilevel cascade converter as a new power condition system has been researched widely. In the battery energy storage system based on multilevel cascade converter, the DC link current of H-bridge contains DC component and ripple components. The ripple current will bring bad effects to the battery energy system. The paper researches on the components of H-bridge DC link current and the propagation characteristics of ripple current based on the H-bridge equivalent circuit model of ripple current. Then the paper proposes a circuit topology of the cascade converter with DC active filter, and elaborates the control strategies for suppressing H-bridge DC ripple current by using DC active filter. Finally, the simulation results are provided to show the effectiveness of the scheme.

Key words： Microgrid energy storage multilevel cascade converter DC link ripple current DC active filter

收稿日期: 2013-12-10 出版日期: 2014-06-18

PACS:

TM464

基金资助:国家高技术研究发展计划（863计划）（2011AA05A107）,国家自然科学基金重点项目（50837001）和高等学校博士学科点专项科研基金（20100111110017）资助项目

作者简介: 丁明男,1956年生,教授,博士生导师,主要研究方向为电力系统规划及可靠性、新能源及其利用和柔性输电系统的仿真与控制等。陈中男,1981年生,博士研究生,主要研究方向为可再生能源发电、储能技术。

引用本文:

丁明, 陈中, 程旭东. 级联储能变换器直流链纹波电流的抑制策略[J]. 电工技术学报, 2014, 29(2): 46-54. Ding Ming, Chen Zhong, Chen Xudong. A Scheme for Suppressing DC Ripple Current of Cascade <br/>Converter for Energy Storage System. Transactions of China Electrotechnical Society, 2014, 29(2): 46-54.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2014/V29/I2/46

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