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首页> 外文期刊>Power Electronics, IET >Analysis and calculation on switching frequency and switching losses of modular multilevel converter with maximum sub-module capacitor voltage deviation
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Analysis and calculation on switching frequency and switching losses of modular multilevel converter with maximum sub-module capacitor voltage deviation

机译：最大子模块电容器电压偏差的模块化多电平转换器的开关频率和开关损耗的分析与计算

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摘要

To reduce switching frequency of modular multilevel converter (MMC), proper sub-module (SM) capacitor voltage deviations would be allowed in the nearest level control. This study proposes a new method to evaluate the switching frequency and switching losses of MMC with maximum SM capacitor voltage deviation. Switching transitions are presented and then the analytic equations of switching frequency and switching losses are derived based on the definite integration approximate substitution. The factors affecting the switching frequency and losses are summarised. Besides, this study analyses the range of maximum SM capacitor voltage deviation as well. The accuracy of this method is proved by a 46-level single-phase MMC under different operating conditions in MATLAB/Simulink. Finally, a 9-level single-phase MMC laboratory prototype is also built to validate this method.
机译：为了降低模块化多电平转换器（MMC）的开关频率，在最近的电平控制中应允许适当的子模块（SM）电容器电压偏差。本研究提出了一种新的方法来评估具有最大SM电容器电压偏差的MMC的开关频率和开关损耗。给出了开关转换，然后基于定积分近似替换推导了开关频率和开关损耗的解析方程。总结了影响开关频率和损耗的因素。此外，本研究还分析了最大SM电容器电压偏差的范围。在MATLAB / Simulink中，通过在不同操作条件下使用46级单相MMC可以证明该方法的准确性。最后，还建立了一个9级单相MMC实验室原型来验证该方法。

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