基于桥臂平衡的隔离型模块化多电平变换器(I-MMC)环流抑制策略  

Arm Balanced Based Circulating Current Suppressing Strategy for Isolated Modular Multilevel Converte(rI-MMC)

作　　者：李金铭 裴忠晨 张瀚文 张皓然 孔德昊 LI Jinming;PEI Zhongchen;ZHANG Hanwen;ZHANG Haoran;KONG Dehao(Dalian Power Supply Company of State Grid Liaoning Electric Power Co.,Ltd.,Dalian 116000,Liaoning,China;College of Electrical Engineering,Northeast Electric Power University,Jilin 132012,Jilin,China)

机构地区：[1]国网辽宁电力有限公司大连供电公司,辽宁大连116000 [2]东北电力大学电气工程学院,吉林吉林132012

出　　处：《电气传动》2022年第5期21-27,共7页Electric Drive

基　　金：国家自然科学基金(51877035)。

摘　　要：提出了一种基于桥臂平衡原理的隔离型模块化多电平变换器(I-MMC)环流抑制策略。首先介绍了I-MMC的拓扑和运行基本原理,I-MMC是一种具有三端口的电力电子变压器,可通过单级变换实现低压直流、中压直流和中压交流之间的电能变换。其次,通过对I-MMC建立平均模型分析了其产生循环分量的原因,基于此,给出了抑制I-MMC循环分量的桥臂平衡控制策略,消除了因I-MMC子模块参数差异引起的非对称电压、电流分量。最后,通过仿真和搭建1 kW实验样机验证了所提控制策略的有效性,即消除了交流端口的直流偏置,并抑制了中压直流端口的电压和电流纹波,对于循环分量具有良好的抑制效果。An isolation modularized multilevel converter(I-MMC)circulating suppressing strategy based on the arm balance was proposed. Firstly,the topology and working principle of I-MMC were introduced. I-MMC is a power electronic converter with three ports,which can achieve the energy conversion among LVDC,MVDC and MVAC through single stage conversion. Secondly,the average model of I-MMC was established to analyze the reasons for the generation of cyclic components. Based on this,the unbalanced voltage and current components caused by the error of submodules parameters in I-MMC can be eliminated,with the help of the proposed arm balance control strategy. Finally,the effectiveness of the proposed control strategy was verified by simulating and building a 1 kW experimental prototype,that is,eliminating the DC offset of the MVAC port and suppressing the voltage and current ripple of the MVDC port,which has an obvious good suppression effect for the cycle component.

关 键 词：环流抑制 隔离型模块化多电平变换器(I-MMC) 多端口级联变换器 平衡控制 

分 类 号：TM46[电气工程—电器]