级联储能变换器直流链纹波电流的抑制策略  

A Scheme for Suppressing DC Ripple Current of Cascade Converter for Energy Storage System

作　　者：丁明[1] 陈中[1] 程旭东[1] 

机构地区：[1]安徽省新能源利用与节能重点实验室(合肥工业大学),合肥230009

出　　处：《电工技术学报》2014年第2期46-54,共9页Transactions of China Electrotechnical Society

基　　金：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);高等学校博士学科点专项科研基金(20100111110017)资助项目

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。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.

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 

分 类 号：TM464[电气工程—电器]