模块化多电平变换器最近电平调制研究

模块化多电平变换器（modular multilevel converter，MMC)的调制方法直接影响其运行时的整体性能。最近电平调制（nearest level modulation,NLM)由于其多电平输出时开关频率低、易于工程实现等优点在中高压大功率场合得到广泛应用。文章针对传统NLM采用电容电压排序，根据电流方向选择相应子模块触发导通的电压均衡方法，在阶梯波形成过程中引入自变量的偏差值，调整近似函数，对发波过程的算法进行修正，使得输出电平数增加一倍，显著提高交流输出电压谐波特性；同时分析比较不同调制偏差量组合情况下的输出电压谐波水平，最后仿真验证了该方法的效果。...

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Bibliographic Details
Published in电测与仪表 Vol. 54; no. 23; pp. 1 - 9
Main Author 张国荣;韩慧颖;王啸飞;陈祥
Format Journal Article
LanguageChinese
Published 合肥工业大学电气与自动化工程学院,合肥,230009%芜湖县广播电视台,安徽芜湖,241199 2017
Subjects
模块化多电平;最近电平调制;电容电压排序;近似函数;输出电压谐波
输出电压谐波
模块化多电平
approximate function
最近电平调制
output voltage harmonics
modular multilevel
capacitor voltage ranking
近似函数
nearest level modulation (NLM)
电容电压排序
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ISSN1001-1390
DOI10.3969/j.issn.1001-1390.2017.23.001

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Summary:模块化多电平变换器（modular multilevel converter，MMC)的调制方法直接影响其运行时的整体性能。最近电平调制（nearest level modulation,NLM)由于其多电平输出时开关频率低、易于工程实现等优点在中高压大功率场合得到广泛应用。文章针对传统NLM采用电容电压排序，根据电流方向选择相应子模块触发导通的电压均衡方法，在阶梯波形成过程中引入自变量的偏差值，调整近似函数，对发波过程的算法进行修正，使得输出电平数增加一倍，显著提高交流输出电压谐波特性；同时分析比较不同调制偏差量组合情况下的输出电压谐波水平，最后仿真验证了该方法的效果。
Bibliography:modular multilevel;nearest level modulation( NLM);capacitor voltage ranking;approximate output voltage harmonics
23-1202/TH
The overall performance of modular multilevel converter(MMC)is directly affected by the modulation method.And the nearest level modulation(NLM)has been widely used in high voltage and high power applications today,due to its lower switching losses and more convenience when implemented in MMC.In this paper,the voltage balancing method based on capacitor voltage sequencing is applied,and then,a small offset is function during the trigger pulse forming process.The function-rounding process is adjusted so that the time of step changing staggered and the harmonic distortions of output wave can be improved dramatically.Furthermore,the output voltage harmonic level of the combination of diferent modulation deviation is analyzed.The inventor model of MMC with10sub-modules is realized by MATLAB/Simulink.Simulation results show the effectiveness of the proposed method.
ISSN:1001-1390
DOI:10.3969/j.issn.1001-1390.2017.23.001