采用最近电平控制的模块化多电平换流器损耗一致性分析  

Loss Consistency Analysis of Modular Multi-Level Converter Using Nearest Level Control

作　　者：周莹坤 齐磊[1] 姜舒婷[1] 崔翔 赵国亮 乔尔敏 蔡博 

机构地区：[1]高电压与电磁兼容北京市重点实验室(华北电力大学),北京市昌平区102206 [2]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206 [3]国网智能电网研究院,北京市昌平区102200

出　　处：《电网技术》2015年第9期2490-2497,共8页Power System Technology

基　　金：国家自然科学基金项目(51277065);国家863高技术基金项目(2012AA050401)~~

摘　　要：为研究半桥结构的模块化多电平换流器(modular multilevel converter,MMC)子模块的损耗分布特性和一致性,首先,分析了MMC换流器的基本工作原理和损耗数值计算方法;其次,应用PLECS仿真软件针对半桥子模块结构进行仿真计算,分析了最近电平控制下不同均压、环流抑制方式下的子模块损耗特性;最后,对比分析了不同控制方式下的子模块损耗特性。研究结果表明:在不影响换流器工作状态的前提下,使用保持因子法均压以及使用三相解耦二次谐波环流抑制算法进行环流抑制时,各子模块损耗分布一致性更高,整体损耗率更低。Analysis of valve losses of half-bridge SM based converter is limited to some particular working conditions and systematical research of sub-module loss consistency is not sufficient right now. This paper reviewed MMC operation mechanism and numerical method of loss calculation. Based on PLECS under NLC modulation, submodule loss characteristics were analyzed,including various voltage balancing methods and circulating current suppression methods. Without prejudice to status of converter working performance,comparison shows that with voltage balancing method of maintaining factor and method of decoupled second harmonic circulation current suppression in three phases the loss distribution consistency of MMC is higher and the loss rate is less.

关 键 词：最近电平控制 模块化多电平换流器 损耗计算 电容电压均衡 环流抑制 

分 类 号：TM76[电气工程—电力系统及自动化]