Impact of Sampling Frequency on Harmonic Distortion for Modular Multilevel Converter
Impact of Sampling Frequency on Harmonic Distortion for Modular Multilevel Converter
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DOI：
10.1109/tpwrd.2010.2078837
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发表时间：
2011
影响因子：
4.4
通讯作者：
Qingrui Tu;Zheng Xu
中科院分区：
文献类型：
--
作者：
Qingrui Tu;Zheng Xu
本文将最近电平控制应用于模块化多电平换流器。由于MMC的高压应用中存在多个子模块（SM），并且所有SM电压都需要被测量和分类，如果均匀采样频率不够高，SM将不会被尽可能快地触发。因此，转换器输出电压电平和电压谐波将受到影响。提出了一种基于均匀采样频率的电压谐波分析方法。为了选择合适的采样频率，两个临界值，这显着影响输出电压水平和电压总谐波失真，计算。基于PSCAD/EMTDC的仿真结果证明了所提出的调制方案的有效性以及正确选择采样频率的重要性。
This paper applies nearest level control (NLC) to the modular multilevel converter (MMC). Since there are a number of submodules (SMs) in high-voltage applications of MMC and all SM voltages are required to be measured and sorted, if the uniform sampling frequency is not high enough, the SM will not be triggered as quickly as possible. Thus, the converter-output voltage levels and voltage harmonics will be affected. A method to systematically analyze the voltage harmonics is presented, considering the uniform sampling frequency. In order to select a proper sampling frequency, two critical values, which significantly influence the output voltage levels and voltage total harmonic distortions, are calculated. Simulation results based on PSCAD/EMTDC proved the validity of the proposed modulation scheme and the importance of a properly selected sampling frequency.