Capacitor sizing of three-level neutral point clamped voltage source inverter for electric vehicles: Effects of modulation and motor characteristics

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-03-01 DOI:10.1049/pel2.12665

Serhat Emir Ogan, Emine Bostanci

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Abstract

A three-level neutral point clamped (3L-NPC) voltage source inverter (VSI) topology can be advantageous in electric vehicles with a high DC-link voltage and a high switching frequency. A bulky DC-link capacitor is not an option; thus, the DC-link capacitor's sizing considering the traction system characteristics is an important design step. This paper investigates how the DC-link capacitor size of a 3L-NPC VSI gets affected by the combination of the interdependent characteristics of an electric drive, such as its power factor, modulation index, current, and fundamental frequency, with the effects of the modulation methods. Five pulse width modulation (PWM) methods, of which three of them have an active neutral point potential control, are compared in terms of their neutral point potential (NPP) oscillations. Then, the size of the DC-link capacitor is determined for each PWM method so that the NPP ripple is kept under desired limits at all operating conditions. It is shown that both the modulation technique and the electric machine characteristics influence the capacitor size. For example, electric machine design modifications can introduce more than a 30% reduction in capacitor size. Finally, DC-link and NPP oscillations with different PWM methods are experimentally validated in a scaled-down 3L-NPC inverter.

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用于电动汽车的三电平中性点箝位电压源逆变器的电容器选型：调制和电机特性的影响

三电平中性点箝位（3L-NPC）电压源逆变器（VSI）拓扑结构在具有高直流链路电压和高开关频率的电动汽车中具有优势。笨重的直流链路电容器是不可取的；因此，考虑牵引系统特性的直流链路电容器选型是一个重要的设计步骤。本文研究了 3L-NPC VSI 的直流链路电容器尺寸如何受到电力驱动相互依存的特性（如功率因数、调制指数、电流和基频）以及调制方法影响的综合影响。本文比较了五种脉宽调制（PWM）方法的中性点电位（NPP）振荡情况，其中三种方法具有主动中性点电位控制功能。然后，为每种 PWM 方法确定了直流链路电容器的大小，以便在所有运行条件下将中性点电位纹波控制在所需的范围内。结果表明，调制技术和电机特性都会影响电容器的大小。例如，修改电机设计可使电容器尺寸缩小 30% 以上。最后，在一个缩小的 3L-NPC 逆变器中对采用不同 PWM 方法的直流链路和 NPP 振荡进行了实验验证。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.