级联H桥储能变换器直流纹波电流的无源与有源抑制策略  

Passive and active schemes of DC ripple suppression for cascaded H-bridge converter of energy storage system

作　　者：丁明[1] 陈中[1] 张国荣[1] 吴杰[1] 朱灿[1] 

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

出　　处：《电力自动化设备》2016年第4期19-24,61,共7页Electric Power Automation Equipment

基　　金：国家高技术研究发展计划(863计划)资助项目(2015AA050104)~~

摘　　要：级联H桥储能变换器直流纹波电流会给储能系统带来效率降低、寿命减少、并网谐波增大等不利影响。分析了电容滤波、LC滤波、LC串联谐振3种无源滤波电路抑制直流链纹波电流的方法,以及它们减小直流链纹波电流的可行性。提出了基于耦合变压器直流有源滤波电路的级联H桥储能变换器拓扑,利用直流有源滤波电路吸收直流链纹波电流,减少流入级联H桥储能变换器直流端口的纹波电流。最后,通过仿真验证了有源滤波方法减小直流链纹波电流的有效性。The DC-link ripple current of cascaded H-bridge converter has negative effects on the energy storage system,such as lower efficiency,reduced lifetime,increased grid-connecting harmonic,etc. Three kinds of passive filter,i.e. capacitor-filter,LC-filter and LC-resonant filter,and the feasibility of applying them to suppress the DC-link ripple current are analyzed. A cascaded H-bridge converter topology based on CTDC-APF（DC Active Power Filter with Coupling Transformer） is proposed,which adopts the DC active filtering circuit to absorb the ripple current of DC-link for reducing the ripple current at the DC port of cascaded H-bridge converter. Simulative results show its effectiveness.

关 键 词：储能 级联H桥变换器 直流链纹波电流 无源滤波电路 直流有源滤波电路 变换器 电流控制 

分 类 号：TM46[电气工程—电器]