采用载波移相调制的模块化多电平换流器损耗一致性分析  

Loss Consistency Analysis of Modular Multilevel Converter Using Carrier Phase Shifted Sinusoidal Pulse Width Modulation

作　　者：周莹坤 齐磊 崔翔 余沸颖 赵国亮 乔尔敏 ZHOU Yingkun QI Lei CUI Xiang YU Feiying ZHAO Guoliang QIAO Ermin(Beijing Key Laboratory of High Voltage ＆ EMC （North China Electric Power University）, Beijing 102206 State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources （North China Electric Power University）, Beijing 102206, China Global Energy Interconnection Research Institute, Beiiing 102200, China)

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102206 [3]全球能源互联网研究院,北京市102200

出　　处：《电力系统自动化》2016年第20期100-106,共7页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51277065);国家高技术研究发展计划(863计划)资助项目(2012AA050401)~~

摘　　要：阐述了模块化多电平换流器的基本工作原理和损耗数值计算方法,应用PLECS仿真软件针对半桥子模块结构,分析了载波移相调制下不同均压、环流抑制方式下的子模块损耗特性,认为在不影响换流器工作状态的前提下,使用能量均衡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。通过比较,还发现不同工况下的子模块损耗一致性接近。最后,对比了载波移相调制与最近电平控制调制方式下的损耗一致性,认为载波移相调制下子模块损耗一致性更高。The modular multilevel converter（MMC）operation mechanism and the numerical method of loss calculation are reviewed.Based on PLECS under carrier phase shifted sinusoidal pulse width modulation（CPS-SPWM）,the sub-module loss characteristics are analyzed,including different voltage balancing methods and circulating current suppression methods.Regardless of the status of the converter working performance,the comparison shows that,with the voltage balancing method of energy balance and circulating current suppression method of three phase decoupled second harmonic circulation current suppression,the loss distribution consistency of MMC is higher and the loss rate lower.The loss consistency of different working conditions is similar.Finally,the loss consistency of nearest level control（NLC）is compared with that of CPSSPWM,and it is shown that with CPS-SPWM the sub-module loss consistency is better.

关 键 词：载波移相调制 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：TM721.1[电气工程—电力系统及自动化] TM46