模块化多电平变换器输出电流谐波优化调制策略对比与分析  

Comparison and Analysis of Output Current Harmonic Optimization Modulation Strategy for Modular Multilevel Converter

作　　者：易灵芝[1] 刘罗 黄晓辉 李旺 陈章 杨乐[1] YI Lingzhi;LIU Luo;HUANG Xiaohui;LI Wang;CHEN Zhang;YANG Le(Hunan Province Engineering Research Center for Multi-energy Collaborative Control Technology,Xiangtan University,Xiangtan 411100,China;College of Electrical and Information Engineering,Hunan University,Changsha 410082,China;CRRC Zhuzhou Locomotive Co.,Ltd,Zhuzhou 412000,China)

机构地区：[1]湘潭大学多能协同控制技术湖南省工程研究中心,湘潭411100 [2]湖南大学电气与信息工程学院,长沙410082 [3]中车株洲电力机车有限公司,株洲412000

出　　处：《电力系统及其自动化学报》2020年第12期85-94,共10页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金资助项目(61572416);湖南省自然科学基金资助项目(2016JJ5033);大功率交流传动电力机车系统集成国家重点实验室开放基金资助项目。

摘　　要：在模块化多电平变换器中广泛使用了最近电平逼近调制与载波移相脉宽调制。当子模块数较少时,输出电流谐波含量高,通过优化调制策略来改善输出电流的谐波含量具有重要意义。本文首先对比分析了输出2N+1电平最近电平逼近、滞环控制原理最近电平逼近、改进型载波移相脉冲宽度调制、混合型最近电平逼近-脉冲宽度调制以及一种无差拍电流控制调制的工作原理和工作特点;然后,在Matlab/Simulink平台搭建5种调制策略在子模块数较少时的仿真模型;其次,针对阀控周期、子模块数、开关频率以及电感值等参数对模块化多电平变换器输出特性的影响,分析了不同调制策略之间输出电流谐波特性的差异及共模电压等;最后,总结了5种调制策略各自的特点和适用场合。The nearest level modulation(NLM)and carrier phase shift pulse width modulation(CPS-PWM)have been widely used in modular multilevel converters(MMCs).When the number of sub-modules(SMs)is small,the harmonic content in output current will be high.Therefore,it is of great significance to optimize the modulation strategy to solve this problem.In this paper,the working principle and working characteristics of output(2N+1)-level NLM,hysteresis control NLM,improved CPS-PWM,hybrid NLM-PWM and deadbeat current control modulation are analyzed through comparison.By establishing the simulation models of the five modulation strategies with fewer SMs on a Matlab/Simu⁃link platform,the influences of parameters such as valve control period,the number of SMs,switching frequency and inductance value on the MMC’s output characteristics are taken into account,and the differences in the output current harmonic characteristics under different modulation strategies,as well as other characteristics including the common mode voltage,are analyzed.Finally,the characteristics and applicable scenarios of the five modulation strategies are summarized.

关 键 词：模块化多电平变换器 最近电平逼近调制 载波移相脉宽调制 输出谐波特性 

分 类 号：TM46[电气工程—电器]