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首页> 外文期刊>Power Electronics, IET >Comparative analysis of symmetric and asymmetric reduced switch MLI topologies using unipolar pulse width modulation strategies
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Comparative analysis of symmetric and asymmetric reduced switch MLI topologies using unipolar pulse width modulation strategies

机译：使用单极性脉冲宽度调制策略的对称和非对称缩减开关MLI拓扑的比较分析

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摘要

Multilevel inverters (MLIs) are gaining familiarity in industries for high-voltage applications. This study is a comparison of symmetric and asymmetric reduced switch MLI topologies which require a lesser number of switches for generating the desired number of voltage levels. In both symmetric and asymmetric conditions, output voltage levels are generated using the same number of switches with different DC source magnitudes. Unipolar pulse width modulation strategy is adapted in these topologies to generate the switching pulses. Three different unipolar references (sine, trapezoidal, 60°) and three different carrier arrangements (phase disposition, alternative phase opposition and disposition and variable frequency) are taken and each reference is compared with three different carrier signals. The performance parameters such as total harmonic distortion (THD), crest factor and distortion factor are evaluated for different modulation indices and compared with both conditions. The proposed topology in symmetric and asymmetric conditions can generate 9-level and 31-level output voltages, respectively, which are simulated using MATLAB/Simulink and verified with the experimental setup. The calculation of %THD using analytical asymptotic formula is also carried out. The theoretical value of %THD is verified to match closely with the simulation and experimental results.
机译：多电平逆变器（MLI）在高压应用行业中已变得越来越熟悉。这项研究是对对称和非对称简化开关MLI拓扑的比较，后者需要较少数量的开关来生成所需数量的电压电平。在对称和非对称条件下，使用相同数量的具有不同直流电源幅度的开关可产生输出电压电平。在这些拓扑中采用单极性脉冲宽度调制策略来生成开关脉冲。取三个不同的单极参考（正弦，梯形，60°）和三个不同的载波布置（相位布置，交替的相位相反和布置以及可变频率），并将每个参考与三个不同的载波信号进行比较。针对不同的调制指数评估了诸如总谐波失真（THD），波峰因数和失真因数之类的性能参数，并与这两种条件进行了比较。所提出的在对称和非对称条件下的拓扑分别可以产生9级和31级输出电压，使用MATLAB / Simulink对其进行仿真并通过实验设置对其进行验证。还使用分析渐近公式进行了％THD的计算。验证了％THD的理论值与仿真和实验结果非常吻合。

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