混合式隔离型模块化多电平变换器  

Hybrid Isolated Modular Multilevel Converter

作　　者：林霖 裴忠晨 蔡国伟[1] 刘闯[1] 裴勇 Lin Lin;Pei Zhongchen;Cai Guowei;Liu Chuang;Pei Yong(School of Electrical Engineering Northeast Electric Power University,Jilin 132012,China;State Grid Fushun Electric Power Company Fushun,113000,China)

机构地区：[1]东北电力大学电气工程学院吉林,132012 [2]国网抚顺供电公司,抚顺113000

出　　处：《电工技术学报》2021年第16期3319-3330,共12页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51877035)。

摘　　要：基于模块化多电平变换器(MMC)的电力电子变压器(PET)因其多端口接入、模块化结构、易实现电压拓展、输出波形质量高等优点受到广泛关注。但由于该PET中压交流侧电压由中压直流母线产生,使其中压交流端口电压始终限制在中压直流端口电压以下。该文结合模块化拓扑结构与单级式功率变换思想,提出一种混合式隔离型模块化多电平变换器(HI-MMC)。首先,分析HI-MMC结构以及组成HI-MMC两种隔离型子模块的拓扑结构及调制策略,通过不同子模块的组合配置可使HI-MMC突破交/直流电压比的限制,实现各端口电压等级的灵活设计;同时,所提出的HI-MMC还具有单级式功率变换、控制系统简单、节约电容等优点;其次,研究不同电压比下各类子模块相应的配置方案,并建立单相HI-MMC系统平均等效模型;最后,通过搭建的一套10kW实验室HI-MMC样机验证了所提拓扑结构的有效性。Thanks to the advantages such as multi-ports,modular topology,easy to achieve voltage level expansion and high quality of output waveform,the power electronic transformer(PET)based on modular multilevel converter(MMC)has received widespread attention.However,because the voltage on the MVAC(medium-voltage alternating current)side is created by the MVDC(medium voltage direct current)bus,the voltage of MVAC port is always lower than the MVDC port voltage.Combining with the modular topology and single-stage power conversion ideas,this paper proposed a hybrid isolated modular multilevel converter(HI-MMC).Firstly,the HI-MMC structure as well as the topology and modulation strategy of two isolated sub-modules in HI-MMC was analyzed.Through the combination of two different sub-modules,HI-MMC could break through the limitation of voltage ratio and realize the flexible design of the voltage level in each port.Moreover,HI-MMC has main advantages of single-stage power conversion,simple control system and capacitance saving.Secondly,the corresponding configuration schemes of various sub-modules under different voltage ratios were studied,and the average equivalent model of single-phase HI-MMC system was established.Finally,the experimental results on a scaled-down 10kW HI-MMC prototype show that the proposed circuit topology is feasible and effective.

关 键 词：电力电子变压器 混合式隔离型模块化多电平变换器 单级式功率变换 电压比 

分 类 号：TM46[电气工程—电器]