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首页> 外文期刊>Power Electronics, IET >Analysis of dc-link capacitor current in three-level neutral point clamped and cascaded H-bridge inverters
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Analysis of dc-link capacitor current in three-level neutral point clamped and cascaded H-bridge inverters

机译：三电平中性点钳位和级联H桥逆变器的直流环节电容器电流分析

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摘要

Dc-link capacitor sizing is a critical aspect of inverter design. This study investigates capacitor sizing for three-level neutral-point-clamped and cascaded H-bridge inverters, based on an analysis of dc-link capacitor current. Methods used to derive expressions for the root-mean-square (rms) value and harmonic spectrum of the capacitor current in two-level inverters, are extended to the three-level inverters. A new numerical approach is also proposed for calculating the capacitor rms current and voltage ripple. MATLAB code is given for the proposed approach, which can be easily adapted to different modulation strategies and applied to higher-level inverters. Capacitor sizing parameters derived according to this approach are presented for a number of common modulation strategies and are used to compare the requirements of the examined three-level topologies. Results are validated by simulations using MATLAB-Simulink.
机译：直流母线电容器的尺寸确定是逆变器设计的关键方面。这项研究基于对直流环节电容器电流的分析，研究了三电平中性点钳位和级联H桥逆变器的电容器尺寸。用于推导两级逆变器中电容器电流的均方根（rms）值和谐波频谱的表达式的方法已扩展到三级逆变器。还提出了一种新的数值方法来计算电容器均方根电流和电压纹波。针对所提出的方法给出了MATLAB代码，该代码可以轻松地适应不同的调制策略，并应用于更高级别的逆变器。提出了根据这种方法得出的电容器尺寸参数，用于多种常见的调制策略，并用于比较所检查的三级拓扑的要求。结果通过使用MATLAB-Simulink的仿真进行了验证。

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